From 0fa389688ee71506dcacbaeafd14acdc7d3b2526 Mon Sep 17 00:00:00 2001 From: Stephen Ingram Date: Wed, 9 Oct 2024 15:55:35 -0400 Subject: [PATCH 1/2] refactor - prebuild distribution --- .gitignore | 1 - dist/commonjs/index.d.ts | 857 +++++++++++++ dist/commonjs/index.d.ts.map | 1 + dist/commonjs/index.js | 1447 ++++++++++++++++++++++ dist/commonjs/index.js.map | 1 + dist/commonjs/index.min.js | 2 + dist/commonjs/index.min.js.map | 7 + dist/commonjs/package.json | 3 + dist/esm/index.d.ts | 857 +++++++++++++ dist/esm/index.d.ts.map | 1 + dist/esm/index.js | 1443 +++++++++++++++++++++ dist/esm/index.js.map | 1 + dist/esm/index.min.js | 2 + dist/esm/index.min.js.map | 7 + dist/esm/package.json | 3 + dist/node_modules/@bubblegroup/lru-cache | 1 + package.json | 8 +- 17 files changed, 4634 insertions(+), 8 deletions(-) create mode 100644 dist/commonjs/index.d.ts create mode 100644 dist/commonjs/index.d.ts.map create mode 100644 dist/commonjs/index.js create mode 100644 dist/commonjs/index.js.map create mode 100644 dist/commonjs/index.min.js create mode 100644 dist/commonjs/index.min.js.map create mode 100644 dist/commonjs/package.json create mode 100644 dist/esm/index.d.ts create mode 100644 dist/esm/index.d.ts.map create mode 100644 dist/esm/index.js create mode 100644 dist/esm/index.js.map create mode 100644 dist/esm/index.min.js create mode 100644 dist/esm/index.min.js.map create mode 100644 dist/esm/package.json create mode 120000 dist/node_modules/@bubblegroup/lru-cache diff --git a/.gitignore b/.gitignore index 0c65801..c9c8256 100644 --- a/.gitignore +++ b/.gitignore @@ -1,4 +1,3 @@ /.tap /node_modules -/dist /docs diff --git a/dist/commonjs/index.d.ts b/dist/commonjs/index.d.ts new file mode 100644 index 0000000..769615c --- /dev/null +++ b/dist/commonjs/index.d.ts @@ -0,0 +1,857 @@ +/** + * @module LRUCache + */ +declare const TYPE: unique symbol; +export type PosInt = number & { + [TYPE]: 'Positive Integer'; +}; +export type Index = number & { + [TYPE]: 'LRUCache Index'; +}; +export type UintArray = Uint8Array | Uint16Array | Uint32Array; +export type NumberArray = UintArray | number[]; +declare class ZeroArray extends Array { + constructor(size: number); +} +export type { ZeroArray }; +export type { Stack }; +export type StackLike = Stack | Index[]; +declare class Stack { + #private; + heap: NumberArray; + length: number; + static create(max: number): StackLike; + constructor(max: number, HeapCls: { + new (n: number): NumberArray; + }); + push(n: Index): void; + pop(): Index; +} +/** + * Promise representing an in-progress {@link LRUCache#fetch} call + */ +export type BackgroundFetch = Promise & { + __returned: BackgroundFetch | undefined; + __abortController: AbortController; + __staleWhileFetching: V | undefined; +}; +export type DisposeTask = [ + value: V, + key: K, + reason: LRUCache.DisposeReason +]; +export declare namespace LRUCache { + /** + * An integer greater than 0, reflecting the calculated size of items + */ + type Size = number; + /** + * Integer greater than 0, representing some number of milliseconds, or the + * time at which a TTL started counting from. + */ + type Milliseconds = number; + /** + * An integer greater than 0, reflecting a number of items + */ + type Count = number; + /** + * The reason why an item was removed from the cache, passed + * to the {@link Disposer} methods. + */ + type DisposeReason = 'evict' | 'set' | 'delete'; + /** + * A method called upon item removal, passed as the + * {@link OptionsBase.dispose} and/or + * {@link OptionsBase.disposeAfter} options. + */ + type Disposer = (value: V, key: K, reason: DisposeReason) => void; + /** + * A function that returns the effective calculated size + * of an entry in the cache. + */ + type SizeCalculator = (value: V, key: K) => Size; + /** + * Options provided to the + * {@link OptionsBase.fetchMethod} function. + */ + interface FetcherOptions { + signal: AbortSignal; + options: FetcherFetchOptions; + /** + * Object provided in the {@link FetchOptions.context} option to + * {@link LRUCache#fetch} + */ + context: FC; + } + /** + * Status object that may be passed to {@link LRUCache#fetch}, + * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}. + */ + interface Status { + /** + * The status of a set() operation. + * + * - add: the item was not found in the cache, and was added + * - update: the item was in the cache, with the same value provided + * - replace: the item was in the cache, and replaced + * - miss: the item was not added to the cache for some reason + */ + set?: 'add' | 'update' | 'replace' | 'miss'; + /** + * the ttl stored for the item, or undefined if ttls are not used. + */ + ttl?: Milliseconds; + /** + * the start time for the item, or undefined if ttls are not used. + */ + start?: Milliseconds; + /** + * The timestamp used for TTL calculation + */ + now?: Milliseconds; + /** + * the remaining ttl for the item, or undefined if ttls are not used. + */ + remainingTTL?: Milliseconds; + /** + * The calculated size for the item, if sizes are used. + */ + entrySize?: Size; + /** + * The total calculated size of the cache, if sizes are used. + */ + totalCalculatedSize?: Size; + /** + * A flag indicating that the item was not stored, due to exceeding the + * {@link OptionsBase.maxEntrySize} + */ + maxEntrySizeExceeded?: true; + /** + * The old value, specified in the case of `set:'update'` or + * `set:'replace'` + */ + oldValue?: V; + /** + * The results of a {@link LRUCache#has} operation + * + * - hit: the item was found in the cache + * - stale: the item was found in the cache, but is stale + * - miss: the item was not found in the cache + */ + has?: 'hit' | 'stale' | 'miss'; + /** + * The status of a {@link LRUCache#fetch} operation. + * Note that this can change as the underlying fetch() moves through + * various states. + * + * - inflight: there is another fetch() for this key which is in process + * - get: there is no fetchMethod, so {@link LRUCache#get} was called. + * - miss: the item is not in cache, and will be fetched. + * - hit: the item is in the cache, and was resolved immediately. + * - stale: the item is in the cache, but stale. + * - refresh: the item is in the cache, and not stale, but + * {@link FetchOptions.forceRefresh} was specified. + */ + fetch?: 'get' | 'inflight' | 'miss' | 'hit' | 'stale' | 'refresh'; + /** + * The {@link OptionsBase.fetchMethod} was called + */ + fetchDispatched?: true; + /** + * The cached value was updated after a successful call to + * {@link OptionsBase.fetchMethod} + */ + fetchUpdated?: true; + /** + * The reason for a fetch() rejection. Either the error raised by the + * {@link OptionsBase.fetchMethod}, or the reason for an + * AbortSignal. + */ + fetchError?: Error; + /** + * The fetch received an abort signal + */ + fetchAborted?: true; + /** + * The abort signal received was ignored, and the fetch was allowed to + * continue. + */ + fetchAbortIgnored?: true; + /** + * The fetchMethod promise resolved successfully + */ + fetchResolved?: true; + /** + * The fetchMethod promise was rejected + */ + fetchRejected?: true; + /** + * The status of a {@link LRUCache#get} operation. + * + * - fetching: The item is currently being fetched. If a previous value + * is present and allowed, that will be returned. + * - stale: The item is in the cache, and is stale. + * - hit: the item is in the cache + * - miss: the item is not in the cache + */ + get?: 'stale' | 'hit' | 'miss'; + /** + * A fetch or get operation returned a stale value. + */ + returnedStale?: true; + } + /** + * options which override the options set in the LRUCache constructor + * when calling {@link LRUCache#fetch}. + * + * This is the union of {@link GetOptions} and {@link SetOptions}, plus + * {@link OptionsBase.noDeleteOnFetchRejection}, + * {@link OptionsBase.allowStaleOnFetchRejection}, + * {@link FetchOptions.forceRefresh}, and + * {@link FetcherOptions.context} + * + * Any of these may be modified in the {@link OptionsBase.fetchMethod} + * function, but the {@link GetOptions} fields will of course have no + * effect, as the {@link LRUCache#get} call already happened by the time + * the fetchMethod is called. + */ + interface FetcherFetchOptions extends Pick, 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet' | 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL' | 'noDeleteOnFetchRejection' | 'allowStaleOnFetchRejection' | 'ignoreFetchAbort' | 'allowStaleOnFetchAbort'> { + status?: Status; + size?: Size; + } + /** + * Options that may be passed to the {@link LRUCache#fetch} method. + */ + interface FetchOptions extends FetcherFetchOptions { + /** + * Set to true to force a re-load of the existing data, even if it + * is not yet stale. + */ + forceRefresh?: boolean; + /** + * Context provided to the {@link OptionsBase.fetchMethod} as + * the {@link FetcherOptions.context} param. + * + * If the FC type is specified as unknown (the default), + * undefined or void, then this is optional. Otherwise, it will + * be required. + */ + context?: FC; + signal?: AbortSignal; + status?: Status; + } + /** + * Options provided to {@link LRUCache#fetch} when the FC type is something + * other than `unknown`, `undefined`, or `void` + */ + interface FetchOptionsWithContext extends FetchOptions { + context: FC; + } + /** + * Options provided to {@link LRUCache#fetch} when the FC type is + * `undefined` or `void` + */ + interface FetchOptionsNoContext extends FetchOptions { + context?: undefined; + } + /** + * Options that may be passed to the {@link LRUCache#has} method. + */ + interface HasOptions extends Pick, 'updateAgeOnHas'> { + status?: Status; + } + /** + * Options that may be passed to the {@link LRUCache#get} method. + */ + interface GetOptions extends Pick, 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'> { + status?: Status; + } + /** + * Options that may be passed to the {@link LRUCache#peek} method. + */ + interface PeekOptions extends Pick, 'allowStale'> { + } + /** + * Options that may be passed to the {@link LRUCache#set} method. + */ + interface SetOptions extends Pick, 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL'> { + /** + * If size tracking is enabled, then setting an explicit size + * in the {@link LRUCache#set} call will prevent calling the + * {@link OptionsBase.sizeCalculation} function. + */ + size?: Size; + /** + * If TTL tracking is enabled, then setting an explicit start + * time in the {@link LRUCache#set} call will override the + * default time from `performance.now()` or `Date.now()`. + * + * Note that it must be a valid value for whichever time-tracking + * method is in use. + */ + start?: Milliseconds; + status?: Status; + } + /** + * The type signature for the {@link OptionsBase.fetchMethod} option. + */ + type Fetcher = (key: K, staleValue: V | undefined, options: FetcherOptions) => Promise | V | undefined | void; + /** + * Options which may be passed to the {@link LRUCache} constructor. + * + * Most of these may be overridden in the various options that use + * them. + * + * Despite all being technically optional, the constructor requires that + * a cache is at minimum limited by one or more of {@link OptionsBase.max}, + * {@link OptionsBase.ttl}, or {@link OptionsBase.maxSize}. + * + * If {@link OptionsBase.ttl} is used alone, then it is strongly advised + * (and in fact required by the type definitions here) that the cache + * also set {@link OptionsBase.ttlAutopurge}, to prevent potentially + * unbounded storage. + */ + interface OptionsBase { + /** + * The maximum number of items to store in the cache before evicting + * old entries. This is read-only on the {@link LRUCache} instance, + * and may not be overridden. + * + * If set, then storage space will be pre-allocated at construction + * time, and the cache will perform significantly faster. + * + * Note that significantly fewer items may be stored, if + * {@link OptionsBase.maxSize} and/or {@link OptionsBase.ttl} are also + * set. + */ + max?: Count; + /** + * Max time in milliseconds for items to live in cache before they are + * considered stale. Note that stale items are NOT preemptively removed + * by default, and MAY live in the cache long after they have expired. + * + * Also, as this cache is optimized for LRU/MRU operations, some of + * the staleness/TTL checks will reduce performance, as they will incur + * overhead by deleting items. + * + * Must be an integer number of ms. If set to 0, this indicates "no TTL" + * + * @default 0 + */ + ttl?: Milliseconds; + /** + * Minimum amount of time in ms in which to check for staleness. + * Defaults to 1, which means that the current time is checked + * at most once per millisecond. + * + * Set to 0 to check the current time every time staleness is tested. + * (This reduces performance, and is theoretically unnecessary.) + * + * Setting this to a higher value will improve performance somewhat + * while using ttl tracking, albeit at the expense of keeping stale + * items around a bit longer than their TTLs would indicate. + * + * @default 1 + */ + ttlResolution?: Milliseconds; + /** + * Preemptively remove stale items from the cache. + * Note that this may significantly degrade performance, + * especially if the cache is storing a large number of items. + * It is almost always best to just leave the stale items in + * the cache, and let them fall out as new items are added. + * + * Note that this means that {@link OptionsBase.allowStale} is a bit + * pointless, as stale items will be deleted almost as soon as they + * expire. + * + * @default false + */ + ttlAutopurge?: boolean; + /** + * Update the age of items on {@link LRUCache#get}, renewing their TTL + * + * Has no effect if {@link OptionsBase.ttl} is not set. + * + * @default false + */ + updateAgeOnGet?: boolean; + /** + * Update the age of items on {@link LRUCache#has}, renewing their TTL + * + * Has no effect if {@link OptionsBase.ttl} is not set. + * + * @default false + */ + updateAgeOnHas?: boolean; + /** + * Allow {@link LRUCache#get} and {@link LRUCache#fetch} calls to return + * stale data, if available. + */ + allowStale?: boolean; + /** + * Function that is called on items when they are dropped from the cache. + * This can be handy if you want to close file descriptors or do other + * cleanup tasks when items are no longer accessible. Called with `key, + * value`. It's called before actually removing the item from the + * internal cache, so it is *NOT* safe to re-add them. + * + * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after + * they have been full removed, when it is safe to add them back to the + * cache. + */ + dispose?: Disposer; + /** + * The same as {@link OptionsBase.dispose}, but called *after* the entry + * is completely removed and the cache is once again in a clean state. + * It is safe to add an item right back into the cache at this point. + * However, note that it is *very* easy to inadvertently create infinite + * recursion this way. + */ + disposeAfter?: Disposer; + /** + * Set to true to suppress calling the + * {@link OptionsBase.dispose} function if the entry key is + * still accessible within the cache. + * This may be overridden by passing an options object to + * {@link LRUCache#set}. + */ + noDisposeOnSet?: boolean; + /** + * Boolean flag to tell the cache to not update the TTL when + * setting a new value for an existing key (ie, when updating a value + * rather than inserting a new value). Note that the TTL value is + * _always_ set (if provided) when adding a new entry into the cache. + * + * Has no effect if a {@link OptionsBase.ttl} is not set. + */ + noUpdateTTL?: boolean; + /** + * If you wish to track item size, you must provide a maxSize + * note that we still will only keep up to max *actual items*, + * if max is set, so size tracking may cause fewer than max items + * to be stored. At the extreme, a single item of maxSize size + * will cause everything else in the cache to be dropped when it + * is added. Use with caution! + * + * Note also that size tracking can negatively impact performance, + * though for most cases, only minimally. + */ + maxSize?: Size; + /** + * The maximum allowed size for any single item in the cache. + * + * If a larger item is passed to {@link LRUCache#set} or returned by a + * {@link OptionsBase.fetchMethod}, then it will not be stored in the + * cache. + */ + maxEntrySize?: Size; + /** + * A function that returns a number indicating the item's size. + * + * If not provided, and {@link OptionsBase.maxSize} or + * {@link OptionsBase.maxEntrySize} are set, then all + * {@link LRUCache#set} calls **must** provide an explicit + * {@link SetOptions.size} or sizeCalculation param. + */ + sizeCalculation?: SizeCalculator; + /** + * Method that provides the implementation for {@link LRUCache#fetch} + */ + fetchMethod?: Fetcher; + /** + * Set to true to suppress the deletion of stale data when a + * {@link OptionsBase.fetchMethod} returns a rejected promise. + */ + noDeleteOnFetchRejection?: boolean; + /** + * Do not delete stale items when they are retrieved with + * {@link LRUCache#get}. + * + * Note that the `get` return value will still be `undefined` + * unless {@link OptionsBase.allowStale} is true. + */ + noDeleteOnStaleGet?: boolean; + /** + * Set to true to allow returning stale data when a + * {@link OptionsBase.fetchMethod} throws an error or returns a rejected + * promise. + * + * This differs from using {@link OptionsBase.allowStale} in that stale + * data will ONLY be returned in the case that the + * {@link LRUCache#fetch} fails, not any other times. + */ + allowStaleOnFetchRejection?: boolean; + /** + * Set to true to return a stale value from the cache when the + * `AbortSignal` passed to the {@link OptionsBase.fetchMethod} dispatches an `'abort'` + * event, whether user-triggered, or due to internal cache behavior. + * + * Unless {@link OptionsBase.ignoreFetchAbort} is also set, the underlying + * {@link OptionsBase.fetchMethod} will still be considered canceled, and + * any value it returns will be ignored and not cached. + * + * Caveat: since fetches are aborted when a new value is explicitly + * set in the cache, this can lead to fetch returning a stale value, + * since that was the fallback value _at the moment the `fetch()` was + * initiated_, even though the new updated value is now present in + * the cache. + * + * For example: + * + * ```ts + * const cache = new LRUCache({ + * ttl: 100, + * fetchMethod: async (url, oldValue, { signal }) => { + * const res = await fetch(url, { signal }) + * return await res.json() + * } + * }) + * cache.set('https://example.com/', { some: 'data' }) + * // 100ms go by... + * const result = cache.fetch('https://example.com/') + * cache.set('https://example.com/', { other: 'thing' }) + * console.log(await result) // { some: 'data' } + * console.log(cache.get('https://example.com/')) // { other: 'thing' } + * ``` + */ + allowStaleOnFetchAbort?: boolean; + /** + * Set to true to ignore the `abort` event emitted by the `AbortSignal` + * object passed to {@link OptionsBase.fetchMethod}, and still cache the + * resulting resolution value, as long as it is not `undefined`. + * + * When used on its own, this means aborted {@link LRUCache#fetch} calls are not + * immediately resolved or rejected when they are aborted, and instead + * take the full time to await. + * + * When used with {@link OptionsBase.allowStaleOnFetchAbort}, aborted + * {@link LRUCache#fetch} calls will resolve immediately to their stale + * cached value or `undefined`, and will continue to process and eventually + * update the cache when they resolve, as long as the resulting value is + * not `undefined`, thus supporting a "return stale on timeout while + * refreshing" mechanism by passing `AbortSignal.timeout(n)` as the signal. + * + * **Note**: regardless of this setting, an `abort` event _is still + * emitted on the `AbortSignal` object_, so may result in invalid results + * when passed to other underlying APIs that use AbortSignals. + * + * This may be overridden in the {@link OptionsBase.fetchMethod} or the + * call to {@link LRUCache#fetch}. + */ + ignoreFetchAbort?: boolean; + } + interface OptionsMaxLimit extends OptionsBase { + max: Count; + } + interface OptionsTTLLimit extends OptionsBase { + ttl: Milliseconds; + ttlAutopurge: boolean; + } + interface OptionsSizeLimit extends OptionsBase { + maxSize: Size; + } + /** + * The valid safe options for the {@link LRUCache} constructor + */ + type Options = OptionsMaxLimit | OptionsSizeLimit | OptionsTTLLimit; + /** + * Entry objects used by {@link LRUCache#load} and {@link LRUCache#dump}, + * and returned by {@link LRUCache#info}. + */ + interface Entry { + value: V; + ttl?: Milliseconds; + size?: Size; + start?: Milliseconds; + } +} +/** + * Default export, the thing you're using this module to get. + * + * All properties from the options object (with the exception of + * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as + * normal public members. (`max` and `maxBase` are read-only getters.) + * Changing any of these will alter the defaults for subsequent method calls, + * but is otherwise safe. + */ +export declare class LRUCache implements Map { + #private; + /** + * {@link LRUCache.OptionsBase.ttl} + */ + ttl: LRUCache.Milliseconds; + /** + * {@link LRUCache.OptionsBase.ttlResolution} + */ + ttlResolution: LRUCache.Milliseconds; + /** + * {@link LRUCache.OptionsBase.ttlAutopurge} + */ + ttlAutopurge: boolean; + /** + * {@link LRUCache.OptionsBase.updateAgeOnGet} + */ + updateAgeOnGet: boolean; + /** + * {@link LRUCache.OptionsBase.updateAgeOnHas} + */ + updateAgeOnHas: boolean; + /** + * {@link LRUCache.OptionsBase.allowStale} + */ + allowStale: boolean; + /** + * {@link LRUCache.OptionsBase.noDisposeOnSet} + */ + noDisposeOnSet: boolean; + /** + * {@link LRUCache.OptionsBase.noUpdateTTL} + */ + noUpdateTTL: boolean; + /** + * {@link LRUCache.OptionsBase.maxEntrySize} + */ + maxEntrySize: LRUCache.Size; + /** + * {@link LRUCache.OptionsBase.sizeCalculation} + */ + sizeCalculation?: LRUCache.SizeCalculator; + /** + * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection} + */ + noDeleteOnFetchRejection: boolean; + /** + * {@link LRUCache.OptionsBase.noDeleteOnStaleGet} + */ + noDeleteOnStaleGet: boolean; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort} + */ + allowStaleOnFetchAbort: boolean; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} + */ + allowStaleOnFetchRejection: boolean; + /** + * {@link LRUCache.OptionsBase.ignoreFetchAbort} + */ + ignoreFetchAbort: boolean; + /** + * Do not call this method unless you need to inspect the + * inner workings of the cache. If anything returned by this + * object is modified in any way, strange breakage may occur. + * + * These fields are private for a reason! + * + * @internal + */ + static unsafeExposeInternals(c: LRUCache): { + starts: ZeroArray | undefined; + ttls: ZeroArray | undefined; + sizes: ZeroArray | undefined; + keyMap: Map; + keyList: (K | undefined)[]; + valList: (V | BackgroundFetch | undefined)[]; + next: NumberArray; + prev: NumberArray; + readonly head: Index; + readonly tail: Index; + free: StackLike; + isBackgroundFetch: (p: any) => boolean; + backgroundFetch: (k: K, index: number | undefined, options: LRUCache.FetchOptions, context: any) => BackgroundFetch; + moveToTail: (index: number) => void; + indexes: (options?: { + allowStale: boolean; + }) => Generator; + rindexes: (options?: { + allowStale: boolean; + }) => Generator; + isStale: (index: number | undefined) => boolean; + }; + /** + * {@link LRUCache.OptionsBase.max} (read-only) + */ + get max(): LRUCache.Count; + /** + * {@link LRUCache.OptionsBase.maxSize} (read-only) + */ + get maxSize(): LRUCache.Count; + /** + * The total computed size of items in the cache (read-only) + */ + get calculatedSize(): LRUCache.Size; + /** + * The number of items stored in the cache (read-only) + */ + get size(): LRUCache.Count; + /** + * {@link LRUCache.OptionsBase.fetchMethod} (read-only) + */ + get fetchMethod(): LRUCache.Fetcher | undefined; + /** + * {@link LRUCache.OptionsBase.dispose} (read-only) + */ + get dispose(): LRUCache.Disposer | undefined; + /** + * {@link LRUCache.OptionsBase.disposeAfter} (read-only) + */ + get disposeAfter(): LRUCache.Disposer | undefined; + constructor(options: LRUCache.Options | LRUCache); + /** + * Return the remaining TTL time for a given entry key + */ + getRemainingTTL(key: K): number; + /** + * Return a generator yielding `[key, value]` pairs, + * in order from most recently used to least recently used. + */ + entries(): Generator<[K, V], void, unknown>; + /** + * Inverse order version of {@link LRUCache.entries} + * + * Return a generator yielding `[key, value]` pairs, + * in order from least recently used to most recently used. + */ + rentries(): Generator<(K | V | BackgroundFetch | undefined)[], void, unknown>; + /** + * Return a generator yielding the keys in the cache, + * in order from most recently used to least recently used. + */ + keys(): Generator; + /** + * Inverse order version of {@link LRUCache.keys} + * + * Return a generator yielding the keys in the cache, + * in order from least recently used to most recently used. + */ + rkeys(): Generator; + /** + * Return a generator yielding the values in the cache, + * in order from most recently used to least recently used. + */ + values(): Generator; + /** + * Inverse order version of {@link LRUCache.values} + * + * Return a generator yielding the values in the cache, + * in order from least recently used to most recently used. + */ + rvalues(): Generator | undefined, void, unknown>; + /** + * Iterating over the cache itself yields the same results as + * {@link LRUCache.entries} + */ + [Symbol.iterator](): Generator<[K, V], void, unknown>; + /** + * A String value that is used in the creation of the default string description of an object. + * Called by the built-in method Object.prototype.toString. + */ + [Symbol.toStringTag]: string; + /** + * Find a value for which the supplied fn method returns a truthy value, + * similar to Array.find(). fn is called as fn(value, key, cache). + */ + find(fn: (v: V, k: K, self: LRUCache) => boolean, getOptions?: LRUCache.GetOptions): V | undefined; + /** + * Call the supplied function on each item in the cache, in order from + * most recently used to least recently used. fn is called as + * fn(value, key, cache). Does not update age or recenty of use. + * Does not iterate over stale values. + */ + forEach(fn: (v: V, k: K, self: LRUCache) => any, thisp?: any): void; + /** + * The same as {@link LRUCache.forEach} but items are iterated over in + * reverse order. (ie, less recently used items are iterated over first.) + */ + rforEach(fn: (v: V, k: K, self: LRUCache) => any, thisp?: any): void; + /** + * Delete any stale entries. Returns true if anything was removed, + * false otherwise. + */ + purgeStale(): boolean; + /** + * Get the extended info about a given entry, to get its value, size, and + * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a + * single key. Always returns stale values, if their info is found in the + * cache, so be sure to check for expired TTLs if relevant. + */ + info(key: K): LRUCache.Entry | undefined; + /** + * Return an array of [key, {@link LRUCache.Entry}] tuples which can be + * passed to cache.load() + */ + dump(): [K, LRUCache.Entry][]; + /** + * Reset the cache and load in the items in entries in the order listed. + * Note that the shape of the resulting cache may be different if the + * same options are not used in both caches. + */ + load(arr: [K, LRUCache.Entry][]): void; + /** + * Add a value to the cache. + * + * Note: if `undefined` is specified as a value, this is an alias for + * {@link LRUCache#delete} + */ + set(k: K, v: V | BackgroundFetch | undefined, setOptions?: LRUCache.SetOptions): this; + /** + * Evict the least recently used item, returning its value or + * `undefined` if cache is empty. + */ + pop(): V | undefined; + /** + * Check if a key is in the cache, without updating the recency of use. + * Will return false if the item is stale, even though it is technically + * in the cache. + * + * Will not update item age unless + * {@link LRUCache.OptionsBase.updateAgeOnHas} is set. + */ + has(k: K, hasOptions?: LRUCache.HasOptions): boolean; + /** + * Like {@link LRUCache#get} but doesn't update recency or delete stale + * items. + * + * Returns `undefined` if the item is stale, unless + * {@link LRUCache.OptionsBase.allowStale} is set. + */ + peek(k: K, peekOptions?: LRUCache.PeekOptions): V | undefined; + /** + * Make an asynchronous cached fetch using the + * {@link LRUCache.OptionsBase.fetchMethod} function. + * + * If multiple fetches for the same key are issued, then they will all be + * coalesced into a single call to fetchMethod. + * + * Note that this means that handling options such as + * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort}, + * {@link LRUCache.FetchOptions.signal}, + * and {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} will be + * determined by the FIRST fetch() call for a given key. + * + * This is a known (fixable) shortcoming which will be addresed on when + * someone complains about it, as the fix would involve added complexity and + * may not be worth the costs for this edge case. + */ + fetch(k: K, fetchOptions: unknown extends FC ? LRUCache.FetchOptions : FC extends undefined | void ? LRUCache.FetchOptionsNoContext : LRUCache.FetchOptionsWithContext): Promise; + fetch(k: unknown extends FC ? K : FC extends undefined | void ? K : never, fetchOptions?: unknown extends FC ? LRUCache.FetchOptions : FC extends undefined | void ? LRUCache.FetchOptionsNoContext : never): Promise; + /** + * Return a value from the cache. Will update the recency of the cache + * entry found. + * + * If the key is not found, get() will return `undefined`. + */ + get(k: K, getOptions?: LRUCache.GetOptions): V | undefined; + /** + * Deletes a key out of the cache. + * Returns true if the key was deleted, false otherwise. + */ + delete(k: K): boolean; + /** + * Clear the cache entirely, throwing away all values. + */ + clear(): void; +} +export default LRUCache; +//# sourceMappingURL=index.d.ts.map \ No newline at end of file diff --git a/dist/commonjs/index.d.ts.map b/dist/commonjs/index.d.ts.map new file mode 100644 index 0000000..1aa47a0 --- /dev/null +++ b/dist/commonjs/index.d.ts.map @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/dist/commonjs/index.js b/dist/commonjs/index.js new file mode 100644 index 0000000..2bd8f69 --- /dev/null +++ b/dist/commonjs/index.js @@ -0,0 +1,1447 @@ +"use strict"; +/** + * @module LRUCache + */ +Object.defineProperty(exports, "__esModule", { value: true }); +exports.LRUCache = void 0; +const perf = typeof performance === 'object' && + performance && + typeof performance.now === 'function' + ? performance + : Date; +const warned = new Set(); +/* c8 ignore start */ +const PROCESS = (typeof process === 'object' && !!process ? process : {}); +/* c8 ignore start */ +const emitWarning = (msg, type, code, fn) => { + typeof PROCESS.emitWarning === 'function' + ? PROCESS.emitWarning(msg, type, code, fn) + : console.error(`[${code}] ${type}: ${msg}`); +}; +let AC = globalThis.AbortController; +let AS = globalThis.AbortSignal; +/* c8 ignore start */ +if (typeof AC === 'undefined') { + //@ts-ignore + AS = class AbortSignal { + onabort; + _onabort = []; + reason; + aborted = false; + addEventListener(_, fn) { + this._onabort.push(fn); + } + }; + //@ts-ignore + AC = class AbortController { + constructor() { + warnACPolyfill(); + } + signal = new AS(); + abort(reason) { + if (this.signal.aborted) + return; + //@ts-ignore + this.signal.reason = reason; + //@ts-ignore + this.signal.aborted = true; + //@ts-ignore + for (const fn of this.signal._onabort) { + fn(reason); + } + this.signal.onabort?.(reason); + } + }; + let printACPolyfillWarning = PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'; + const warnACPolyfill = () => { + if (!printACPolyfillWarning) + return; + printACPolyfillWarning = false; + emitWarning('AbortController is not defined. If using lru-cache in ' + + 'node 14, load an AbortController polyfill from the ' + + '`node-abort-controller` package. A minimal polyfill is ' + + 'provided for use by LRUCache.fetch(), but it should not be ' + + 'relied upon in other contexts (eg, passing it to other APIs that ' + + 'use AbortController/AbortSignal might have undesirable effects). ' + + 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.', 'NO_ABORT_CONTROLLER', 'ENOTSUP', warnACPolyfill); + }; +} +/* c8 ignore stop */ +const shouldWarn = (code) => !warned.has(code); +const TYPE = Symbol('type'); +const isPosInt = (n) => n && n === Math.floor(n) && n > 0 && isFinite(n); +/* c8 ignore start */ +// This is a little bit ridiculous, tbh. +// The maximum array length is 2^32-1 or thereabouts on most JS impls. +// And well before that point, you're caching the entire world, I mean, +// that's ~32GB of just integers for the next/prev links, plus whatever +// else to hold that many keys and values. Just filling the memory with +// zeroes at init time is brutal when you get that big. +// But why not be complete? +// Maybe in the future, these limits will have expanded. +const getUintArray = (max) => !isPosInt(max) + ? null + : max <= Math.pow(2, 8) + ? Uint8Array + : max <= Math.pow(2, 16) + ? Uint16Array + : max <= Math.pow(2, 32) + ? Uint32Array + : max <= Number.MAX_SAFE_INTEGER + ? ZeroArray + : null; +/* c8 ignore stop */ +class ZeroArray extends Array { + constructor(size) { + super(size); + this.fill(0); + } +} +class Stack { + heap; + length; + // private constructor + static #constructing = false; + static create(max) { + const HeapCls = getUintArray(max); + if (!HeapCls) + return []; + Stack.#constructing = true; + const s = new Stack(max, HeapCls); + Stack.#constructing = false; + return s; + } + constructor(max, HeapCls) { + /* c8 ignore start */ + if (!Stack.#constructing) { + throw new TypeError('instantiate Stack using Stack.create(n)'); + } + /* c8 ignore stop */ + this.heap = new HeapCls(max); + this.length = 0; + } + push(n) { + this.heap[this.length++] = n; + } + pop() { + return this.heap[--this.length]; + } +} +/** + * Default export, the thing you're using this module to get. + * + * All properties from the options object (with the exception of + * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as + * normal public members. (`max` and `maxBase` are read-only getters.) + * Changing any of these will alter the defaults for subsequent method calls, + * but is otherwise safe. + */ +class LRUCache { + // properties coming in from the options of these, only max and maxSize + // really *need* to be protected. The rest can be modified, as they just + // set defaults for various methods. + #max; + #maxSize; + #dispose; + #disposeAfter; + #fetchMethod; + /** + * {@link LRUCache.OptionsBase.ttl} + */ + ttl; + /** + * {@link LRUCache.OptionsBase.ttlResolution} + */ + ttlResolution; + /** + * {@link LRUCache.OptionsBase.ttlAutopurge} + */ + ttlAutopurge; + /** + * {@link LRUCache.OptionsBase.updateAgeOnGet} + */ + updateAgeOnGet; + /** + * {@link LRUCache.OptionsBase.updateAgeOnHas} + */ + updateAgeOnHas; + /** + * {@link LRUCache.OptionsBase.allowStale} + */ + allowStale; + /** + * {@link LRUCache.OptionsBase.noDisposeOnSet} + */ + noDisposeOnSet; + /** + * {@link LRUCache.OptionsBase.noUpdateTTL} + */ + noUpdateTTL; + /** + * {@link LRUCache.OptionsBase.maxEntrySize} + */ + maxEntrySize; + /** + * {@link LRUCache.OptionsBase.sizeCalculation} + */ + sizeCalculation; + /** + * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection} + */ + noDeleteOnFetchRejection; + /** + * {@link LRUCache.OptionsBase.noDeleteOnStaleGet} + */ + noDeleteOnStaleGet; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort} + */ + allowStaleOnFetchAbort; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} + */ + allowStaleOnFetchRejection; + /** + * {@link LRUCache.OptionsBase.ignoreFetchAbort} + */ + ignoreFetchAbort; + // computed properties + #size; + #calculatedSize; + #keyMap; + #keyList; + #valList; + #next; + #prev; + #head; + #tail; + #free; + #disposed; + #sizes; + #starts; + #ttls; + #hasDispose; + #hasFetchMethod; + #hasDisposeAfter; + /** + * Do not call this method unless you need to inspect the + * inner workings of the cache. If anything returned by this + * object is modified in any way, strange breakage may occur. + * + * These fields are private for a reason! + * + * @internal + */ + static unsafeExposeInternals(c) { + return { + // properties + starts: c.#starts, + ttls: c.#ttls, + sizes: c.#sizes, + keyMap: c.#keyMap, + keyList: c.#keyList, + valList: c.#valList, + next: c.#next, + prev: c.#prev, + get head() { + return c.#head; + }, + get tail() { + return c.#tail; + }, + free: c.#free, + // methods + isBackgroundFetch: (p) => c.#isBackgroundFetch(p), + backgroundFetch: (k, index, options, context) => c.#backgroundFetch(k, index, options, context), + moveToTail: (index) => c.#moveToTail(index), + indexes: (options) => c.#indexes(options), + rindexes: (options) => c.#rindexes(options), + isStale: (index) => c.#isStale(index), + }; + } + // Protected read-only members + /** + * {@link LRUCache.OptionsBase.max} (read-only) + */ + get max() { + return this.#max; + } + /** + * {@link LRUCache.OptionsBase.maxSize} (read-only) + */ + get maxSize() { + return this.#maxSize; + } + /** + * The total computed size of items in the cache (read-only) + */ + get calculatedSize() { + return this.#calculatedSize; + } + /** + * The number of items stored in the cache (read-only) + */ + get size() { + return this.#size; + } + /** + * {@link LRUCache.OptionsBase.fetchMethod} (read-only) + */ + get fetchMethod() { + return this.#fetchMethod; + } + /** + * {@link LRUCache.OptionsBase.dispose} (read-only) + */ + get dispose() { + return this.#dispose; + } + /** + * {@link LRUCache.OptionsBase.disposeAfter} (read-only) + */ + get disposeAfter() { + return this.#disposeAfter; + } + constructor(options) { + const { max = 0, ttl, ttlResolution = 1, ttlAutopurge, updateAgeOnGet, updateAgeOnHas, allowStale, dispose, disposeAfter, noDisposeOnSet, noUpdateTTL, maxSize = 0, maxEntrySize = 0, sizeCalculation, fetchMethod, noDeleteOnFetchRejection, noDeleteOnStaleGet, allowStaleOnFetchRejection, allowStaleOnFetchAbort, ignoreFetchAbort, } = options; + if (max !== 0 && !isPosInt(max)) { + throw new TypeError('max option must be a nonnegative integer'); + } + const UintArray = max ? getUintArray(max) : Array; + if (!UintArray) { + throw new Error('invalid max value: ' + max); + } + this.#max = max; + this.#maxSize = maxSize; + this.maxEntrySize = maxEntrySize || this.#maxSize; + this.sizeCalculation = sizeCalculation; + if (this.sizeCalculation) { + if (!this.#maxSize && !this.maxEntrySize) { + throw new TypeError('cannot set sizeCalculation without setting maxSize or maxEntrySize'); + } + if (typeof this.sizeCalculation !== 'function') { + throw new TypeError('sizeCalculation set to non-function'); + } + } + if (fetchMethod !== undefined && + typeof fetchMethod !== 'function') { + throw new TypeError('fetchMethod must be a function if specified'); + } + this.#fetchMethod = fetchMethod; + this.#hasFetchMethod = !!fetchMethod; + this.#keyMap = new Map(); + this.#keyList = new Array(max).fill(undefined); + this.#valList = new Array(max).fill(undefined); + this.#next = new UintArray(max); + this.#prev = new UintArray(max); + this.#head = 0; + this.#tail = 0; + this.#free = Stack.create(max); + this.#size = 0; + this.#calculatedSize = 0; + if (typeof dispose === 'function') { + this.#dispose = dispose; + } + if (typeof disposeAfter === 'function') { + this.#disposeAfter = disposeAfter; + this.#disposed = []; + } + else { + this.#disposeAfter = undefined; + this.#disposed = undefined; + } + this.#hasDispose = !!this.#dispose; + this.#hasDisposeAfter = !!this.#disposeAfter; + this.noDisposeOnSet = !!noDisposeOnSet; + this.noUpdateTTL = !!noUpdateTTL; + this.noDeleteOnFetchRejection = !!noDeleteOnFetchRejection; + this.allowStaleOnFetchRejection = !!allowStaleOnFetchRejection; + this.allowStaleOnFetchAbort = !!allowStaleOnFetchAbort; + this.ignoreFetchAbort = !!ignoreFetchAbort; + // NB: maxEntrySize is set to maxSize if it's set + if (this.maxEntrySize !== 0) { + if (this.#maxSize !== 0) { + if (!isPosInt(this.#maxSize)) { + throw new TypeError('maxSize must be a positive integer if specified'); + } + } + if (!isPosInt(this.maxEntrySize)) { + throw new TypeError('maxEntrySize must be a positive integer if specified'); + } + this.#initializeSizeTracking(); + } + this.allowStale = !!allowStale; + this.noDeleteOnStaleGet = !!noDeleteOnStaleGet; + this.updateAgeOnGet = !!updateAgeOnGet; + this.updateAgeOnHas = !!updateAgeOnHas; + this.ttlResolution = + isPosInt(ttlResolution) || ttlResolution === 0 + ? ttlResolution + : 1; + this.ttlAutopurge = !!ttlAutopurge; + this.ttl = ttl || 0; + if (this.ttl) { + if (!isPosInt(this.ttl)) { + throw new TypeError('ttl must be a positive integer if specified'); + } + this.#initializeTTLTracking(); + } + // do not allow completely unbounded caches + if (this.#max === 0 && this.ttl === 0 && this.#maxSize === 0) { + throw new TypeError('At least one of max, maxSize, or ttl is required'); + } + if (!this.ttlAutopurge && !this.#max && !this.#maxSize) { + const code = 'LRU_CACHE_UNBOUNDED'; + if (shouldWarn(code)) { + warned.add(code); + const msg = 'TTL caching without ttlAutopurge, max, or maxSize can ' + + 'result in unbounded memory consumption.'; + emitWarning(msg, 'UnboundedCacheWarning', code, LRUCache); + } + } + } + /** + * Return the remaining TTL time for a given entry key + */ + getRemainingTTL(key) { + return this.#keyMap.has(key) ? Infinity : 0; + } + #initializeTTLTracking() { + const ttls = new ZeroArray(this.#max); + const starts = new ZeroArray(this.#max); + this.#ttls = ttls; + this.#starts = starts; + this.#setItemTTL = (index, ttl, start = perf.now()) => { + starts[index] = ttl !== 0 ? start : 0; + ttls[index] = ttl; + if (ttl !== 0 && this.ttlAutopurge) { + const t = setTimeout(() => { + if (this.#isStale(index)) { + this.delete(this.#keyList[index]); + } + }, ttl + 1); + // unref() not supported on all platforms + /* c8 ignore start */ + if (t.unref) { + t.unref(); + } + /* c8 ignore stop */ + } + }; + this.#updateItemAge = index => { + starts[index] = ttls[index] !== 0 ? perf.now() : 0; + }; + this.#statusTTL = (status, index) => { + if (ttls[index]) { + const ttl = ttls[index]; + const start = starts[index]; + /* c8 ignore next */ + if (!ttl || !start) + return; + status.ttl = ttl; + status.start = start; + status.now = cachedNow || getNow(); + const age = status.now - start; + status.remainingTTL = ttl - age; + } + }; + // debounce calls to perf.now() to 1s so we're not hitting + // that costly call repeatedly. + let cachedNow = 0; + const getNow = () => { + const n = perf.now(); + if (this.ttlResolution > 0) { + cachedNow = n; + const t = setTimeout(() => (cachedNow = 0), this.ttlResolution); + // not available on all platforms + /* c8 ignore start */ + if (t.unref) { + t.unref(); + } + /* c8 ignore stop */ + } + return n; + }; + this.getRemainingTTL = key => { + const index = this.#keyMap.get(key); + if (index === undefined) { + return 0; + } + const ttl = ttls[index]; + const start = starts[index]; + if (!ttl || !start) { + return Infinity; + } + const age = (cachedNow || getNow()) - start; + return ttl - age; + }; + this.#isStale = index => { + const s = starts[index]; + const t = ttls[index]; + return !!t && !!s && (cachedNow || getNow()) - s > t; + }; + } + // conditionally set private methods related to TTL + #updateItemAge = () => { }; + #statusTTL = () => { }; + #setItemTTL = () => { }; + /* c8 ignore stop */ + #isStale = () => false; + #initializeSizeTracking() { + const sizes = new ZeroArray(this.#max); + this.#calculatedSize = 0; + this.#sizes = sizes; + this.#removeItemSize = index => { + this.#calculatedSize -= sizes[index]; + sizes[index] = 0; + }; + this.#requireSize = (k, v, size, sizeCalculation) => { + // provisionally accept background fetches. + // actual value size will be checked when they return. + if (this.#isBackgroundFetch(v)) { + return 0; + } + if (!isPosInt(size)) { + if (sizeCalculation) { + if (typeof sizeCalculation !== 'function') { + throw new TypeError('sizeCalculation must be a function'); + } + size = sizeCalculation(v, k); + if (!isPosInt(size)) { + throw new TypeError('sizeCalculation return invalid (expect positive integer)'); + } + } + else { + throw new TypeError('invalid size value (must be positive integer). ' + + 'When maxSize or maxEntrySize is used, sizeCalculation ' + + 'or size must be set.'); + } + } + return size; + }; + this.#addItemSize = (index, size, status) => { + sizes[index] = size; + if (this.#maxSize) { + const maxSize = this.#maxSize - sizes[index]; + while (this.#calculatedSize > maxSize) { + this.#evict(true); + } + } + this.#calculatedSize += sizes[index]; + if (status) { + status.entrySize = size; + status.totalCalculatedSize = this.#calculatedSize; + } + }; + } + #removeItemSize = _i => { }; + #addItemSize = (_i, _s, _st) => { }; + #requireSize = (_k, _v, size, sizeCalculation) => { + if (size || sizeCalculation) { + throw new TypeError('cannot set size without setting maxSize or maxEntrySize on cache'); + } + return 0; + }; + *#indexes({ allowStale = this.allowStale } = {}) { + if (this.#size) { + for (let i = this.#tail; true;) { + if (!this.#isValidIndex(i)) { + break; + } + if (allowStale || !this.#isStale(i)) { + yield i; + } + if (i === this.#head) { + break; + } + else { + i = this.#prev[i]; + } + } + } + } + *#rindexes({ allowStale = this.allowStale } = {}) { + if (this.#size) { + for (let i = this.#head; true;) { + if (!this.#isValidIndex(i)) { + break; + } + if (allowStale || !this.#isStale(i)) { + yield i; + } + if (i === this.#tail) { + break; + } + else { + i = this.#next[i]; + } + } + } + } + #isValidIndex(index) { + return (index !== undefined && + this.#keyMap.get(this.#keyList[index]) === index); + } + /** + * Return a generator yielding `[key, value]` pairs, + * in order from most recently used to least recently used. + */ + *entries() { + for (const i of this.#indexes()) { + if (this.#valList[i] !== undefined && + this.#keyList[i] !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield [this.#keyList[i], this.#valList[i]]; + } + } + } + /** + * Inverse order version of {@link LRUCache.entries} + * + * Return a generator yielding `[key, value]` pairs, + * in order from least recently used to most recently used. + */ + *rentries() { + for (const i of this.#rindexes()) { + if (this.#valList[i] !== undefined && + this.#keyList[i] !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield [this.#keyList[i], this.#valList[i]]; + } + } + } + /** + * Return a generator yielding the keys in the cache, + * in order from most recently used to least recently used. + */ + *keys() { + for (const i of this.#indexes()) { + const k = this.#keyList[i]; + if (k !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield k; + } + } + } + /** + * Inverse order version of {@link LRUCache.keys} + * + * Return a generator yielding the keys in the cache, + * in order from least recently used to most recently used. + */ + *rkeys() { + for (const i of this.#rindexes()) { + const k = this.#keyList[i]; + if (k !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield k; + } + } + } + /** + * Return a generator yielding the values in the cache, + * in order from most recently used to least recently used. + */ + *values() { + for (const i of this.#indexes()) { + const v = this.#valList[i]; + if (v !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield this.#valList[i]; + } + } + } + /** + * Inverse order version of {@link LRUCache.values} + * + * Return a generator yielding the values in the cache, + * in order from least recently used to most recently used. + */ + *rvalues() { + for (const i of this.#rindexes()) { + const v = this.#valList[i]; + if (v !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield this.#valList[i]; + } + } + } + /** + * Iterating over the cache itself yields the same results as + * {@link LRUCache.entries} + */ + [Symbol.iterator]() { + return this.entries(); + } + /** + * A String value that is used in the creation of the default string description of an object. + * Called by the built-in method Object.prototype.toString. + */ + [Symbol.toStringTag] = 'LRUCache'; + /** + * Find a value for which the supplied fn method returns a truthy value, + * similar to Array.find(). fn is called as fn(value, key, cache). + */ + find(fn, getOptions = {}) { + for (const i of this.#indexes()) { + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + continue; + if (fn(value, this.#keyList[i], this)) { + return this.get(this.#keyList[i], getOptions); + } + } + } + /** + * Call the supplied function on each item in the cache, in order from + * most recently used to least recently used. fn is called as + * fn(value, key, cache). Does not update age or recenty of use. + * Does not iterate over stale values. + */ + forEach(fn, thisp = this) { + for (const i of this.#indexes()) { + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + continue; + fn.call(thisp, value, this.#keyList[i], this); + } + } + /** + * The same as {@link LRUCache.forEach} but items are iterated over in + * reverse order. (ie, less recently used items are iterated over first.) + */ + rforEach(fn, thisp = this) { + for (const i of this.#rindexes()) { + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + continue; + fn.call(thisp, value, this.#keyList[i], this); + } + } + /** + * Delete any stale entries. Returns true if anything was removed, + * false otherwise. + */ + purgeStale() { + let deleted = false; + for (const i of this.#rindexes({ allowStale: true })) { + if (this.#isStale(i)) { + this.delete(this.#keyList[i]); + deleted = true; + } + } + return deleted; + } + /** + * Get the extended info about a given entry, to get its value, size, and + * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a + * single key. Always returns stale values, if their info is found in the + * cache, so be sure to check for expired TTLs if relevant. + */ + info(key) { + const i = this.#keyMap.get(key); + if (i === undefined) + return undefined; + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + return undefined; + const entry = { value }; + if (this.#ttls && this.#starts) { + const ttl = this.#ttls[i]; + const start = this.#starts[i]; + if (ttl && start) { + const remain = ttl - (perf.now() - start); + entry.ttl = remain; + entry.start = Date.now(); + } + } + if (this.#sizes) { + entry.size = this.#sizes[i]; + } + return entry; + } + /** + * Return an array of [key, {@link LRUCache.Entry}] tuples which can be + * passed to cache.load() + */ + dump() { + const arr = []; + for (const i of this.#indexes({ allowStale: true })) { + const key = this.#keyList[i]; + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined || key === undefined) + continue; + const entry = { value }; + if (this.#ttls && this.#starts) { + entry.ttl = this.#ttls[i]; + // always dump the start relative to a portable timestamp + // it's ok for this to be a bit slow, it's a rare operation. + const age = perf.now() - this.#starts[i]; + entry.start = Math.floor(Date.now() - age); + } + if (this.#sizes) { + entry.size = this.#sizes[i]; + } + arr.unshift([key, entry]); + } + return arr; + } + /** + * Reset the cache and load in the items in entries in the order listed. + * Note that the shape of the resulting cache may be different if the + * same options are not used in both caches. + */ + load(arr) { + this.clear(); + for (const [key, entry] of arr) { + if (entry.start) { + // entry.start is a portable timestamp, but we may be using + // node's performance.now(), so calculate the offset, so that + // we get the intended remaining TTL, no matter how long it's + // been on ice. + // + // it's ok for this to be a bit slow, it's a rare operation. + const age = Date.now() - entry.start; + entry.start = perf.now() - age; + } + this.set(key, entry.value, entry); + } + } + /** + * Add a value to the cache. + * + * Note: if `undefined` is specified as a value, this is an alias for + * {@link LRUCache#delete} + */ + set(k, v, setOptions = {}) { + if (v === undefined) { + this.delete(k); + return this; + } + const { ttl = this.ttl, start, noDisposeOnSet = this.noDisposeOnSet, sizeCalculation = this.sizeCalculation, status, } = setOptions; + let { noUpdateTTL = this.noUpdateTTL } = setOptions; + const size = this.#requireSize(k, v, setOptions.size || 0, sizeCalculation); + // if the item doesn't fit, don't do anything + // NB: maxEntrySize set to maxSize by default + if (this.maxEntrySize && size > this.maxEntrySize) { + if (status) { + status.set = 'miss'; + status.maxEntrySizeExceeded = true; + } + // have to delete, in case something is there already. + this.delete(k); + return this; + } + let index = this.#size === 0 ? undefined : this.#keyMap.get(k); + if (index === undefined) { + // addition + index = (this.#size === 0 + ? this.#tail + : this.#free.length !== 0 + ? this.#free.pop() + : this.#size === this.#max + ? this.#evict(false) + : this.#size); + this.#keyList[index] = k; + this.#valList[index] = v; + this.#keyMap.set(k, index); + this.#next[this.#tail] = index; + this.#prev[index] = this.#tail; + this.#tail = index; + this.#size++; + this.#addItemSize(index, size, status); + if (status) + status.set = 'add'; + noUpdateTTL = false; + } + else { + // update + this.#moveToTail(index); + const oldVal = this.#valList[index]; + if (v !== oldVal) { + if (this.#hasFetchMethod && this.#isBackgroundFetch(oldVal)) { + oldVal.__abortController.abort(new Error('replaced')); + const { __staleWhileFetching: s } = oldVal; + if (s !== undefined && !noDisposeOnSet) { + if (this.#hasDispose) { + this.#dispose?.(s, k, 'set'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([s, k, 'set']); + } + } + } + else if (!noDisposeOnSet) { + if (this.#hasDispose) { + this.#dispose?.(oldVal, k, 'set'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([oldVal, k, 'set']); + } + } + this.#removeItemSize(index); + this.#addItemSize(index, size, status); + this.#valList[index] = v; + if (status) { + status.set = 'replace'; + const oldValue = oldVal && this.#isBackgroundFetch(oldVal) + ? oldVal.__staleWhileFetching + : oldVal; + if (oldValue !== undefined) + status.oldValue = oldValue; + } + } + else if (status) { + status.set = 'update'; + } + } + if (ttl !== 0 && !this.#ttls) { + this.#initializeTTLTracking(); + } + if (this.#ttls) { + if (!noUpdateTTL) { + this.#setItemTTL(index, ttl, start); + } + if (status) + this.#statusTTL(status, index); + } + if (!noDisposeOnSet && this.#hasDisposeAfter && this.#disposed) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + return this; + } + /** + * Evict the least recently used item, returning its value or + * `undefined` if cache is empty. + */ + pop() { + try { + while (this.#size) { + const val = this.#valList[this.#head]; + this.#evict(true); + if (this.#isBackgroundFetch(val)) { + if (val.__staleWhileFetching) { + return val.__staleWhileFetching; + } + } + else if (val !== undefined) { + return val; + } + } + } + finally { + if (this.#hasDisposeAfter && this.#disposed) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + } + } + #evict(free) { + const head = this.#head; + const k = this.#keyList[head]; + const v = this.#valList[head]; + if (this.#hasFetchMethod && this.#isBackgroundFetch(v)) { + v.__abortController.abort(new Error('evicted')); + } + else if (this.#hasDispose || this.#hasDisposeAfter) { + if (this.#hasDispose) { + this.#dispose?.(v, k, 'evict'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([v, k, 'evict']); + } + } + this.#removeItemSize(head); + // if we aren't about to use the index, then null these out + if (free) { + this.#keyList[head] = undefined; + this.#valList[head] = undefined; + this.#free.push(head); + } + if (this.#size === 1) { + this.#head = this.#tail = 0; + this.#free.length = 0; + } + else { + this.#head = this.#next[head]; + } + this.#keyMap.delete(k); + this.#size--; + return head; + } + /** + * Check if a key is in the cache, without updating the recency of use. + * Will return false if the item is stale, even though it is technically + * in the cache. + * + * Will not update item age unless + * {@link LRUCache.OptionsBase.updateAgeOnHas} is set. + */ + has(k, hasOptions = {}) { + const { updateAgeOnHas = this.updateAgeOnHas, status } = hasOptions; + const index = this.#keyMap.get(k); + if (index !== undefined) { + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v) && + v.__staleWhileFetching === undefined) { + return false; + } + if (!this.#isStale(index)) { + if (updateAgeOnHas) { + this.#updateItemAge(index); + } + if (status) { + status.has = 'hit'; + this.#statusTTL(status, index); + } + return true; + } + else if (status) { + status.has = 'stale'; + this.#statusTTL(status, index); + } + } + else if (status) { + status.has = 'miss'; + } + return false; + } + /** + * Like {@link LRUCache#get} but doesn't update recency or delete stale + * items. + * + * Returns `undefined` if the item is stale, unless + * {@link LRUCache.OptionsBase.allowStale} is set. + */ + peek(k, peekOptions = {}) { + const { allowStale = this.allowStale } = peekOptions; + const index = this.#keyMap.get(k); + if (index === undefined || + (!allowStale && this.#isStale(index))) { + return; + } + const v = this.#valList[index]; + // either stale and allowed, or forcing a refresh of non-stale value + return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v; + } + #backgroundFetch(k, index, options, context) { + const v = index === undefined ? undefined : this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + return v; + } + const ac = new AC(); + const { signal } = options; + // when/if our AC signals, then stop listening to theirs. + signal?.addEventListener('abort', () => ac.abort(signal.reason), { + signal: ac.signal, + }); + const fetchOpts = { + signal: ac.signal, + options, + context, + }; + const cb = (v, updateCache = false) => { + const { aborted } = ac.signal; + const ignoreAbort = options.ignoreFetchAbort && v !== undefined; + if (options.status) { + if (aborted && !updateCache) { + options.status.fetchAborted = true; + options.status.fetchError = ac.signal.reason; + if (ignoreAbort) + options.status.fetchAbortIgnored = true; + } + else { + options.status.fetchResolved = true; + } + } + if (aborted && !ignoreAbort && !updateCache) { + return fetchFail(ac.signal.reason); + } + // either we didn't abort, and are still here, or we did, and ignored + const bf = p; + if (this.#valList[index] === p) { + if (v === undefined) { + if (bf.__staleWhileFetching) { + this.#valList[index] = bf.__staleWhileFetching; + } + else { + this.delete(k); + } + } + else { + if (options.status) + options.status.fetchUpdated = true; + this.set(k, v, fetchOpts.options); + } + } + return v; + }; + const eb = (er) => { + if (options.status) { + options.status.fetchRejected = true; + options.status.fetchError = er; + } + return fetchFail(er); + }; + const fetchFail = (er) => { + const { aborted } = ac.signal; + const allowStaleAborted = aborted && options.allowStaleOnFetchAbort; + const allowStale = allowStaleAborted || options.allowStaleOnFetchRejection; + const noDelete = allowStale || options.noDeleteOnFetchRejection; + const bf = p; + if (this.#valList[index] === p) { + // if we allow stale on fetch rejections, then we need to ensure that + // the stale value is not removed from the cache when the fetch fails. + const del = !noDelete || bf.__staleWhileFetching === undefined; + if (del) { + this.delete(k); + } + else if (!allowStaleAborted) { + // still replace the *promise* with the stale value, + // since we are done with the promise at this point. + // leave it untouched if we're still waiting for an + // aborted background fetch that hasn't yet returned. + this.#valList[index] = bf.__staleWhileFetching; + } + } + if (allowStale) { + if (options.status && bf.__staleWhileFetching !== undefined) { + options.status.returnedStale = true; + } + return bf.__staleWhileFetching; + } + else if (bf.__returned === bf) { + throw er; + } + }; + const pcall = (res, rej) => { + const fmp = this.#fetchMethod?.(k, v, fetchOpts); + if (fmp && fmp instanceof Promise) { + fmp.then(v => res(v === undefined ? undefined : v), rej); + } + // ignored, we go until we finish, regardless. + // defer check until we are actually aborting, + // so fetchMethod can override. + ac.signal.addEventListener('abort', () => { + if (!options.ignoreFetchAbort || + options.allowStaleOnFetchAbort) { + res(undefined); + // when it eventually resolves, update the cache. + if (options.allowStaleOnFetchAbort) { + res = v => cb(v, true); + } + } + }); + }; + if (options.status) + options.status.fetchDispatched = true; + const p = new Promise(pcall).then(cb, eb); + const bf = Object.assign(p, { + __abortController: ac, + __staleWhileFetching: v, + __returned: undefined, + }); + if (index === undefined) { + // internal, don't expose status. + this.set(k, bf, { ...fetchOpts.options, status: undefined }); + index = this.#keyMap.get(k); + } + else { + this.#valList[index] = bf; + } + return bf; + } + #isBackgroundFetch(p) { + if (!this.#hasFetchMethod) + return false; + const b = p; + return (!!b && + b instanceof Promise && + b.hasOwnProperty('__staleWhileFetching') && + b.__abortController instanceof AC); + } + async fetch(k, fetchOptions = {}) { + const { + // get options + allowStale = this.allowStale, updateAgeOnGet = this.updateAgeOnGet, noDeleteOnStaleGet = this.noDeleteOnStaleGet, + // set options + ttl = this.ttl, noDisposeOnSet = this.noDisposeOnSet, size = 0, sizeCalculation = this.sizeCalculation, noUpdateTTL = this.noUpdateTTL, + // fetch exclusive options + noDeleteOnFetchRejection = this.noDeleteOnFetchRejection, allowStaleOnFetchRejection = this.allowStaleOnFetchRejection, ignoreFetchAbort = this.ignoreFetchAbort, allowStaleOnFetchAbort = this.allowStaleOnFetchAbort, context, forceRefresh = false, status, signal, } = fetchOptions; + if (!this.#hasFetchMethod) { + if (status) + status.fetch = 'get'; + return this.get(k, { + allowStale, + updateAgeOnGet, + noDeleteOnStaleGet, + status, + }); + } + const options = { + allowStale, + updateAgeOnGet, + noDeleteOnStaleGet, + ttl, + noDisposeOnSet, + size, + sizeCalculation, + noUpdateTTL, + noDeleteOnFetchRejection, + allowStaleOnFetchRejection, + allowStaleOnFetchAbort, + ignoreFetchAbort, + status, + signal, + }; + let index = this.#keyMap.get(k); + if (index === undefined) { + if (status) + status.fetch = 'miss'; + const p = this.#backgroundFetch(k, index, options, context); + return (p.__returned = p); + } + else { + // in cache, maybe already fetching + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + const stale = allowStale && v.__staleWhileFetching !== undefined; + if (status) { + status.fetch = 'inflight'; + if (stale) + status.returnedStale = true; + } + return stale ? v.__staleWhileFetching : (v.__returned = v); + } + // if we force a refresh, that means do NOT serve the cached value, + // unless we are already in the process of refreshing the cache. + const isStale = this.#isStale(index); + if (!forceRefresh && !isStale) { + if (status) + status.fetch = 'hit'; + this.#moveToTail(index); + if (updateAgeOnGet) { + this.#updateItemAge(index); + } + if (status) + this.#statusTTL(status, index); + return v; + } + // ok, it is stale or a forced refresh, and not already fetching. + // refresh the cache. + const p = this.#backgroundFetch(k, index, options, context); + const hasStale = p.__staleWhileFetching !== undefined; + const staleVal = hasStale && allowStale; + if (status) { + status.fetch = isStale ? 'stale' : 'refresh'; + if (staleVal && isStale) + status.returnedStale = true; + } + return staleVal ? p.__staleWhileFetching : (p.__returned = p); + } + } + /** + * Return a value from the cache. Will update the recency of the cache + * entry found. + * + * If the key is not found, get() will return `undefined`. + */ + get(k, getOptions = {}) { + const { allowStale = this.allowStale, updateAgeOnGet = this.updateAgeOnGet, noDeleteOnStaleGet = this.noDeleteOnStaleGet, status, } = getOptions; + const index = this.#keyMap.get(k); + if (index !== undefined) { + const value = this.#valList[index]; + const fetching = this.#isBackgroundFetch(value); + if (status) + this.#statusTTL(status, index); + if (this.#isStale(index)) { + if (status) + status.get = 'stale'; + // delete only if not an in-flight background fetch + if (!fetching) { + if (!noDeleteOnStaleGet) { + this.delete(k); + } + if (status && allowStale) + status.returnedStale = true; + return allowStale ? value : undefined; + } + else { + if (status && + allowStale && + value.__staleWhileFetching !== undefined) { + status.returnedStale = true; + } + return allowStale ? value.__staleWhileFetching : undefined; + } + } + else { + if (status) + status.get = 'hit'; + // if we're currently fetching it, we don't actually have it yet + // it's not stale, which means this isn't a staleWhileRefetching. + // If it's not stale, and fetching, AND has a __staleWhileFetching + // value, then that means the user fetched with {forceRefresh:true}, + // so it's safe to return that value. + if (fetching) { + return value.__staleWhileFetching; + } + this.#moveToTail(index); + if (updateAgeOnGet) { + this.#updateItemAge(index); + } + return value; + } + } + else if (status) { + status.get = 'miss'; + } + } + #connect(p, n) { + this.#prev[n] = p; + this.#next[p] = n; + } + #moveToTail(index) { + // if tail already, nothing to do + // if head, move head to next[index] + // else + // move next[prev[index]] to next[index] (head has no prev) + // move prev[next[index]] to prev[index] + // prev[index] = tail + // next[tail] = index + // tail = index + if (index !== this.#tail) { + if (index === this.#head) { + this.#head = this.#next[index]; + } + else { + this.#connect(this.#prev[index], this.#next[index]); + } + this.#connect(this.#tail, index); + this.#tail = index; + } + } + /** + * Deletes a key out of the cache. + * Returns true if the key was deleted, false otherwise. + */ + delete(k) { + let deleted = false; + if (this.#size !== 0) { + const index = this.#keyMap.get(k); + if (index !== undefined) { + deleted = true; + if (this.#size === 1) { + this.clear(); + } + else { + this.#removeItemSize(index); + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + v.__abortController.abort(new Error('deleted')); + } + else if (this.#hasDispose || this.#hasDisposeAfter) { + if (this.#hasDispose) { + this.#dispose?.(v, k, 'delete'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([v, k, 'delete']); + } + } + this.#keyMap.delete(k); + this.#keyList[index] = undefined; + this.#valList[index] = undefined; + if (index === this.#tail) { + this.#tail = this.#prev[index]; + } + else if (index === this.#head) { + this.#head = this.#next[index]; + } + else { + const pi = this.#prev[index]; + this.#next[pi] = this.#next[index]; + const ni = this.#next[index]; + this.#prev[ni] = this.#prev[index]; + } + this.#size--; + this.#free.push(index); + } + } + } + if (this.#hasDisposeAfter && this.#disposed?.length) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + return deleted; + } + /** + * Clear the cache entirely, throwing away all values. + */ + clear() { + for (const index of this.#rindexes({ allowStale: true })) { + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + v.__abortController.abort(new Error('deleted')); + } + else { + const k = this.#keyList[index]; + if (this.#hasDispose) { + this.#dispose?.(v, k, 'delete'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([v, k, 'delete']); + } + } + } + this.#keyMap.clear(); + this.#valList.fill(undefined); + this.#keyList.fill(undefined); + if (this.#ttls && this.#starts) { + this.#ttls.fill(0); + this.#starts.fill(0); + } + if (this.#sizes) { + this.#sizes.fill(0); + } + this.#head = 0; + this.#tail = 0; + this.#free.length = 0; + this.#calculatedSize = 0; + this.#size = 0; + if (this.#hasDisposeAfter && this.#disposed) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + } +} +exports.LRUCache = LRUCache; +exports.default = LRUCache; +//# sourceMappingURL=index.js.map \ No newline at end of file diff --git a/dist/commonjs/index.js.map b/dist/commonjs/index.js.map new file mode 100644 index 0000000..a9ed019 --- /dev/null +++ b/dist/commonjs/index.js.map @@ -0,0 +1 @@ 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* @module LRUCache\n */\n\n// module-private names and types\ntype Perf = { now: () => number }\nconst perf: Perf =\n typeof performance === 'object' &&\n performance &&\n typeof performance.now === 'function'\n ? performance\n : Date\n\nconst warned = new Set()\n\n// either a function or a class\ntype ForC = ((...a: any[]) => any) | { new (...a: any[]): any }\n\n/* c8 ignore start */\nconst PROCESS = (\n typeof process === 'object' && !!process ? process : {}\n) as { [k: string]: any }\n/* c8 ignore start */\n\nconst emitWarning = (\n msg: string,\n type: string,\n code: string,\n fn: ForC\n) => {\n typeof PROCESS.emitWarning === 'function'\n ? PROCESS.emitWarning(msg, type, code, fn)\n : console.error(`[${code}] ${type}: ${msg}`)\n}\n\nlet AC = globalThis.AbortController\nlet AS = globalThis.AbortSignal\n\n/* c8 ignore start */\nif (typeof AC === 'undefined') {\n //@ts-ignore\n AS = class AbortSignal {\n onabort?: (...a: any[]) => any\n _onabort: ((...a: any[]) => any)[] = []\n reason?: any\n aborted: boolean = false\n addEventListener(_: string, fn: (...a: any[]) => any) {\n this._onabort.push(fn)\n }\n }\n //@ts-ignore\n AC = class AbortController {\n constructor() {\n warnACPolyfill()\n }\n signal = new AS()\n abort(reason: any) {\n if (this.signal.aborted) return\n //@ts-ignore\n this.signal.reason = reason\n //@ts-ignore\n this.signal.aborted = true\n //@ts-ignore\n for (const fn of this.signal._onabort) {\n fn(reason)\n }\n this.signal.onabort?.(reason)\n }\n }\n let printACPolyfillWarning =\n PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'\n const warnACPolyfill = () => {\n if (!printACPolyfillWarning) return\n printACPolyfillWarning = false\n emitWarning(\n 'AbortController is not defined. If using lru-cache in ' +\n 'node 14, load an AbortController polyfill from the ' +\n '`node-abort-controller` package. A minimal polyfill is ' +\n 'provided for use by LRUCache.fetch(), but it should not be ' +\n 'relied upon in other contexts (eg, passing it to other APIs that ' +\n 'use AbortController/AbortSignal might have undesirable effects). ' +\n 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.',\n 'NO_ABORT_CONTROLLER',\n 'ENOTSUP',\n warnACPolyfill\n )\n }\n}\n/* c8 ignore stop */\n\nconst shouldWarn = (code: string) => !warned.has(code)\n\nconst TYPE = Symbol('type')\nexport type PosInt = number & { [TYPE]: 'Positive Integer' }\nexport type Index = number & { [TYPE]: 'LRUCache Index' }\n\nconst isPosInt = (n: any): n is PosInt =>\n n && n === Math.floor(n) && n > 0 && isFinite(n)\n\nexport type UintArray = Uint8Array | Uint16Array | Uint32Array\nexport type NumberArray = UintArray | number[]\n\n/* c8 ignore start */\n// This is a little bit ridiculous, tbh.\n// The maximum array length is 2^32-1 or thereabouts on most JS impls.\n// And well before that point, you're caching the entire world, I mean,\n// that's ~32GB of just integers for the next/prev links, plus whatever\n// else to hold that many keys and values. Just filling the memory with\n// zeroes at init time is brutal when you get that big.\n// But why not be complete?\n// Maybe in the future, these limits will have expanded.\nconst getUintArray = (max: number) =>\n !isPosInt(max)\n ? null\n : max <= Math.pow(2, 8)\n ? Uint8Array\n : max <= Math.pow(2, 16)\n ? Uint16Array\n : max <= Math.pow(2, 32)\n ? Uint32Array\n : max <= Number.MAX_SAFE_INTEGER\n ? ZeroArray\n : null\n/* c8 ignore stop */\n\nclass ZeroArray extends Array {\n constructor(size: number) {\n super(size)\n this.fill(0)\n }\n}\nexport type { ZeroArray }\nexport type { Stack }\n\nexport type StackLike = Stack | Index[]\nclass Stack {\n heap: NumberArray\n length: number\n // private constructor\n static #constructing: boolean = false\n static create(max: number): StackLike {\n const HeapCls = getUintArray(max)\n if (!HeapCls) return []\n Stack.#constructing = true\n const s = new Stack(max, HeapCls)\n Stack.#constructing = false\n return s\n }\n constructor(\n max: number,\n HeapCls: { new (n: number): NumberArray }\n ) {\n /* c8 ignore start */\n if (!Stack.#constructing) {\n throw new TypeError('instantiate Stack using Stack.create(n)')\n }\n /* c8 ignore stop */\n this.heap = new HeapCls(max)\n this.length = 0\n }\n push(n: Index) {\n this.heap[this.length++] = n\n }\n pop(): Index {\n return this.heap[--this.length] as Index\n }\n}\n\n/**\n * Promise representing an in-progress {@link LRUCache#fetch} call\n */\nexport type BackgroundFetch = Promise & {\n __returned: BackgroundFetch | undefined\n __abortController: AbortController\n __staleWhileFetching: V | undefined\n}\n\nexport type DisposeTask = [\n value: V,\n key: K,\n reason: LRUCache.DisposeReason\n]\n\nexport namespace LRUCache {\n /**\n * An integer greater than 0, reflecting the calculated size of items\n */\n export type Size = number\n\n /**\n * Integer greater than 0, representing some number of milliseconds, or the\n * time at which a TTL started counting from.\n */\n export type Milliseconds = number\n\n /**\n * An integer greater than 0, reflecting a number of items\n */\n export type Count = number\n\n /**\n * The reason why an item was removed from the cache, passed\n * to the {@link Disposer} methods.\n */\n export type DisposeReason = 'evict' | 'set' | 'delete'\n /**\n * A method called upon item removal, passed as the\n * {@link OptionsBase.dispose} and/or\n * {@link OptionsBase.disposeAfter} options.\n */\n export type Disposer = (\n value: V,\n key: K,\n reason: DisposeReason\n ) => void\n\n /**\n * A function that returns the effective calculated size\n * of an entry in the cache.\n */\n export type SizeCalculator = (value: V, key: K) => Size\n\n /**\n * Options provided to the\n * {@link OptionsBase.fetchMethod} function.\n */\n export interface FetcherOptions {\n signal: AbortSignal\n options: FetcherFetchOptions\n /**\n * Object provided in the {@link FetchOptions.context} option to\n * {@link LRUCache#fetch}\n */\n context: FC\n }\n\n /**\n * Status object that may be passed to {@link LRUCache#fetch},\n * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}.\n */\n export interface Status {\n /**\n * The status of a set() operation.\n *\n * - add: the item was not found in the cache, and was added\n * - update: the item was in the cache, with the same value provided\n * - replace: the item was in the cache, and replaced\n * - miss: the item was not added to the cache for some reason\n */\n set?: 'add' | 'update' | 'replace' | 'miss'\n\n /**\n * the ttl stored for the item, or undefined if ttls are not used.\n */\n ttl?: Milliseconds\n\n /**\n * the start time for the item, or undefined if ttls are not used.\n */\n start?: Milliseconds\n\n /**\n * The timestamp used for TTL calculation\n */\n now?: Milliseconds\n\n /**\n * the remaining ttl for the item, or undefined if ttls are not used.\n */\n remainingTTL?: Milliseconds\n\n /**\n * The calculated size for the item, if sizes are used.\n */\n entrySize?: Size\n\n /**\n * The total calculated size of the cache, if sizes are used.\n */\n totalCalculatedSize?: Size\n\n /**\n * A flag indicating that the item was not stored, due to exceeding the\n * {@link OptionsBase.maxEntrySize}\n */\n maxEntrySizeExceeded?: true\n\n /**\n * The old value, specified in the case of `set:'update'` or\n * `set:'replace'`\n */\n oldValue?: V\n\n /**\n * The results of a {@link LRUCache#has} operation\n *\n * - hit: the item was found in the cache\n * - stale: the item was found in the cache, but is stale\n * - miss: the item was not found in the cache\n */\n has?: 'hit' | 'stale' | 'miss'\n\n /**\n * The status of a {@link LRUCache#fetch} operation.\n * Note that this can change as the underlying fetch() moves through\n * various states.\n *\n * - inflight: there is another fetch() for this key which is in process\n * - get: there is no fetchMethod, so {@link LRUCache#get} was called.\n * - miss: the item is not in cache, and will be fetched.\n * - hit: the item is in the cache, and was resolved immediately.\n * - stale: the item is in the cache, but stale.\n * - refresh: the item is in the cache, and not stale, but\n * {@link FetchOptions.forceRefresh} was specified.\n */\n fetch?: 'get' | 'inflight' | 'miss' | 'hit' | 'stale' | 'refresh'\n\n /**\n * The {@link OptionsBase.fetchMethod} was called\n */\n fetchDispatched?: true\n\n /**\n * The cached value was updated after a successful call to\n * {@link OptionsBase.fetchMethod}\n */\n fetchUpdated?: true\n\n /**\n * The reason for a fetch() rejection. Either the error raised by the\n * {@link OptionsBase.fetchMethod}, or the reason for an\n * AbortSignal.\n */\n fetchError?: Error\n\n /**\n * The fetch received an abort signal\n */\n fetchAborted?: true\n\n /**\n * The abort signal received was ignored, and the fetch was allowed to\n * continue.\n */\n fetchAbortIgnored?: true\n\n /**\n * The fetchMethod promise resolved successfully\n */\n fetchResolved?: true\n\n /**\n * The fetchMethod promise was rejected\n */\n fetchRejected?: true\n\n /**\n * The status of a {@link LRUCache#get} operation.\n *\n * - fetching: The item is currently being fetched. If a previous value\n * is present and allowed, that will be returned.\n * - stale: The item is in the cache, and is stale.\n * - hit: the item is in the cache\n * - miss: the item is not in the cache\n */\n get?: 'stale' | 'hit' | 'miss'\n\n /**\n * A fetch or get operation returned a stale value.\n */\n returnedStale?: true\n }\n\n /**\n * options which override the options set in the LRUCache constructor\n * when calling {@link LRUCache#fetch}.\n *\n * This is the union of {@link GetOptions} and {@link SetOptions}, plus\n * {@link OptionsBase.noDeleteOnFetchRejection},\n * {@link OptionsBase.allowStaleOnFetchRejection},\n * {@link FetchOptions.forceRefresh}, and\n * {@link FetcherOptions.context}\n *\n * Any of these may be modified in the {@link OptionsBase.fetchMethod}\n * function, but the {@link GetOptions} fields will of course have no\n * effect, as the {@link LRUCache#get} call already happened by the time\n * the fetchMethod is called.\n */\n export interface FetcherFetchOptions\n extends Pick<\n OptionsBase,\n | 'allowStale'\n | 'updateAgeOnGet'\n | 'noDeleteOnStaleGet'\n | 'sizeCalculation'\n | 'ttl'\n | 'noDisposeOnSet'\n | 'noUpdateTTL'\n | 'noDeleteOnFetchRejection'\n | 'allowStaleOnFetchRejection'\n | 'ignoreFetchAbort'\n | 'allowStaleOnFetchAbort'\n > {\n status?: Status\n size?: Size\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#fetch} method.\n */\n export interface FetchOptions\n extends FetcherFetchOptions {\n /**\n * Set to true to force a re-load of the existing data, even if it\n * is not yet stale.\n */\n forceRefresh?: boolean\n /**\n * Context provided to the {@link OptionsBase.fetchMethod} as\n * the {@link FetcherOptions.context} param.\n *\n * If the FC type is specified as unknown (the default),\n * undefined or void, then this is optional. Otherwise, it will\n * be required.\n */\n context?: FC\n signal?: AbortSignal\n status?: Status\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is something\n * other than `unknown`, `undefined`, or `void`\n */\n export interface FetchOptionsWithContext\n extends FetchOptions {\n context: FC\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is\n * `undefined` or `void`\n */\n export interface FetchOptionsNoContext\n extends FetchOptions {\n context?: undefined\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#has} method.\n */\n export interface HasOptions\n extends Pick, 'updateAgeOnHas'> {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#get} method.\n */\n export interface GetOptions\n extends Pick<\n OptionsBase,\n 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'\n > {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#peek} method.\n */\n export interface PeekOptions\n extends Pick, 'allowStale'> {}\n\n /**\n * Options that may be passed to the {@link LRUCache#set} method.\n */\n export interface SetOptions\n extends Pick<\n OptionsBase,\n 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL'\n > {\n /**\n * If size tracking is enabled, then setting an explicit size\n * in the {@link LRUCache#set} call will prevent calling the\n * {@link OptionsBase.sizeCalculation} function.\n */\n size?: Size\n /**\n * If TTL tracking is enabled, then setting an explicit start\n * time in the {@link LRUCache#set} call will override the\n * default time from `performance.now()` or `Date.now()`.\n *\n * Note that it must be a valid value for whichever time-tracking\n * method is in use.\n */\n start?: Milliseconds\n status?: Status\n }\n\n /**\n * The type signature for the {@link OptionsBase.fetchMethod} option.\n */\n export type Fetcher = (\n key: K,\n staleValue: V | undefined,\n options: FetcherOptions\n ) => Promise | V | undefined | void\n\n /**\n * Options which may be passed to the {@link LRUCache} constructor.\n *\n * Most of these may be overridden in the various options that use\n * them.\n *\n * Despite all being technically optional, the constructor requires that\n * a cache is at minimum limited by one or more of {@link OptionsBase.max},\n * {@link OptionsBase.ttl}, or {@link OptionsBase.maxSize}.\n *\n * If {@link OptionsBase.ttl} is used alone, then it is strongly advised\n * (and in fact required by the type definitions here) that the cache\n * also set {@link OptionsBase.ttlAutopurge}, to prevent potentially\n * unbounded storage.\n */\n export interface OptionsBase {\n /**\n * The maximum number of items to store in the cache before evicting\n * old entries. This is read-only on the {@link LRUCache} instance,\n * and may not be overridden.\n *\n * If set, then storage space will be pre-allocated at construction\n * time, and the cache will perform significantly faster.\n *\n * Note that significantly fewer items may be stored, if\n * {@link OptionsBase.maxSize} and/or {@link OptionsBase.ttl} are also\n * set.\n */\n max?: Count\n\n /**\n * Max time in milliseconds for items to live in cache before they are\n * considered stale. Note that stale items are NOT preemptively removed\n * by default, and MAY live in the cache long after they have expired.\n *\n * Also, as this cache is optimized for LRU/MRU operations, some of\n * the staleness/TTL checks will reduce performance, as they will incur\n * overhead by deleting items.\n *\n * Must be an integer number of ms. If set to 0, this indicates \"no TTL\"\n *\n * @default 0\n */\n ttl?: Milliseconds\n\n /**\n * Minimum amount of time in ms in which to check for staleness.\n * Defaults to 1, which means that the current time is checked\n * at most once per millisecond.\n *\n * Set to 0 to check the current time every time staleness is tested.\n * (This reduces performance, and is theoretically unnecessary.)\n *\n * Setting this to a higher value will improve performance somewhat\n * while using ttl tracking, albeit at the expense of keeping stale\n * items around a bit longer than their TTLs would indicate.\n *\n * @default 1\n */\n ttlResolution?: Milliseconds\n\n /**\n * Preemptively remove stale items from the cache.\n * Note that this may significantly degrade performance,\n * especially if the cache is storing a large number of items.\n * It is almost always best to just leave the stale items in\n * the cache, and let them fall out as new items are added.\n *\n * Note that this means that {@link OptionsBase.allowStale} is a bit\n * pointless, as stale items will be deleted almost as soon as they\n * expire.\n *\n * @default false\n */\n ttlAutopurge?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#get}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnGet?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#has}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnHas?: boolean\n\n /**\n * Allow {@link LRUCache#get} and {@link LRUCache#fetch} calls to return\n * stale data, if available.\n */\n allowStale?: boolean\n\n /**\n * Function that is called on items when they are dropped from the cache.\n * This can be handy if you want to close file descriptors or do other\n * cleanup tasks when items are no longer accessible. Called with `key,\n * value`. It's called before actually removing the item from the\n * internal cache, so it is *NOT* safe to re-add them.\n *\n * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after\n * they have been full removed, when it is safe to add them back to the\n * cache.\n */\n dispose?: Disposer\n\n /**\n * The same as {@link OptionsBase.dispose}, but called *after* the entry\n * is completely removed and the cache is once again in a clean state.\n * It is safe to add an item right back into the cache at this point.\n * However, note that it is *very* easy to inadvertently create infinite\n * recursion this way.\n */\n disposeAfter?: Disposer\n\n /**\n * Set to true to suppress calling the\n * {@link OptionsBase.dispose} function if the entry key is\n * still accessible within the cache.\n * This may be overridden by passing an options object to\n * {@link LRUCache#set}.\n */\n noDisposeOnSet?: boolean\n\n /**\n * Boolean flag to tell the cache to not update the TTL when\n * setting a new value for an existing key (ie, when updating a value\n * rather than inserting a new value). Note that the TTL value is\n * _always_ set (if provided) when adding a new entry into the cache.\n *\n * Has no effect if a {@link OptionsBase.ttl} is not set.\n */\n noUpdateTTL?: boolean\n\n /**\n * If you wish to track item size, you must provide a maxSize\n * note that we still will only keep up to max *actual items*,\n * if max is set, so size tracking may cause fewer than max items\n * to be stored. At the extreme, a single item of maxSize size\n * will cause everything else in the cache to be dropped when it\n * is added. Use with caution!\n *\n * Note also that size tracking can negatively impact performance,\n * though for most cases, only minimally.\n */\n maxSize?: Size\n\n /**\n * The maximum allowed size for any single item in the cache.\n *\n * If a larger item is passed to {@link LRUCache#set} or returned by a\n * {@link OptionsBase.fetchMethod}, then it will not be stored in the\n * cache.\n */\n maxEntrySize?: Size\n\n /**\n * A function that returns a number indicating the item's size.\n *\n * If not provided, and {@link OptionsBase.maxSize} or\n * {@link OptionsBase.maxEntrySize} are set, then all\n * {@link LRUCache#set} calls **must** provide an explicit\n * {@link SetOptions.size} or sizeCalculation param.\n */\n sizeCalculation?: SizeCalculator\n\n /**\n * Method that provides the implementation for {@link LRUCache#fetch}\n */\n fetchMethod?: Fetcher\n\n /**\n * Set to true to suppress the deletion of stale data when a\n * {@link OptionsBase.fetchMethod} returns a rejected promise.\n */\n noDeleteOnFetchRejection?: boolean\n\n /**\n * Do not delete stale items when they are retrieved with\n * {@link LRUCache#get}.\n *\n * Note that the `get` return value will still be `undefined`\n * unless {@link OptionsBase.allowStale} is true.\n */\n noDeleteOnStaleGet?: boolean\n\n /**\n * Set to true to allow returning stale data when a\n * {@link OptionsBase.fetchMethod} throws an error or returns a rejected\n * promise.\n *\n * This differs from using {@link OptionsBase.allowStale} in that stale\n * data will ONLY be returned in the case that the\n * {@link LRUCache#fetch} fails, not any other times.\n */\n allowStaleOnFetchRejection?: boolean\n\n /**\n * Set to true to return a stale value from the cache when the\n * `AbortSignal` passed to the {@link OptionsBase.fetchMethod} dispatches an `'abort'`\n * event, whether user-triggered, or due to internal cache behavior.\n *\n * Unless {@link OptionsBase.ignoreFetchAbort} is also set, the underlying\n * {@link OptionsBase.fetchMethod} will still be considered canceled, and\n * any value it returns will be ignored and not cached.\n *\n * Caveat: since fetches are aborted when a new value is explicitly\n * set in the cache, this can lead to fetch returning a stale value,\n * since that was the fallback value _at the moment the `fetch()` was\n * initiated_, even though the new updated value is now present in\n * the cache.\n *\n * For example:\n *\n * ```ts\n * const cache = new LRUCache({\n * ttl: 100,\n * fetchMethod: async (url, oldValue, { signal }) => {\n * const res = await fetch(url, { signal })\n * return await res.json()\n * }\n * })\n * cache.set('https://example.com/', { some: 'data' })\n * // 100ms go by...\n * const result = cache.fetch('https://example.com/')\n * cache.set('https://example.com/', { other: 'thing' })\n * console.log(await result) // { some: 'data' }\n * console.log(cache.get('https://example.com/')) // { other: 'thing' }\n * ```\n */\n allowStaleOnFetchAbort?: boolean\n\n /**\n * Set to true to ignore the `abort` event emitted by the `AbortSignal`\n * object passed to {@link OptionsBase.fetchMethod}, and still cache the\n * resulting resolution value, as long as it is not `undefined`.\n *\n * When used on its own, this means aborted {@link LRUCache#fetch} calls are not\n * immediately resolved or rejected when they are aborted, and instead\n * take the full time to await.\n *\n * When used with {@link OptionsBase.allowStaleOnFetchAbort}, aborted\n * {@link LRUCache#fetch} calls will resolve immediately to their stale\n * cached value or `undefined`, and will continue to process and eventually\n * update the cache when they resolve, as long as the resulting value is\n * not `undefined`, thus supporting a \"return stale on timeout while\n * refreshing\" mechanism by passing `AbortSignal.timeout(n)` as the signal.\n *\n * **Note**: regardless of this setting, an `abort` event _is still\n * emitted on the `AbortSignal` object_, so may result in invalid results\n * when passed to other underlying APIs that use AbortSignals.\n *\n * This may be overridden in the {@link OptionsBase.fetchMethod} or the\n * call to {@link LRUCache#fetch}.\n */\n ignoreFetchAbort?: boolean\n }\n\n export interface OptionsMaxLimit\n extends OptionsBase {\n max: Count\n }\n export interface OptionsTTLLimit\n extends OptionsBase {\n ttl: Milliseconds\n ttlAutopurge: boolean\n }\n export interface OptionsSizeLimit\n extends OptionsBase {\n maxSize: Size\n }\n\n /**\n * The valid safe options for the {@link LRUCache} constructor\n */\n export type Options =\n | OptionsMaxLimit\n | OptionsSizeLimit\n | OptionsTTLLimit\n\n /**\n * Entry objects used by {@link LRUCache#load} and {@link LRUCache#dump},\n * and returned by {@link LRUCache#info}.\n */\n export interface Entry {\n value: V\n ttl?: Milliseconds\n size?: Size\n start?: Milliseconds\n }\n}\n\n/**\n * Default export, the thing you're using this module to get.\n *\n * All properties from the options object (with the exception of\n * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as\n * normal public members. (`max` and `maxBase` are read-only getters.)\n * Changing any of these will alter the defaults for subsequent method calls,\n * but is otherwise safe.\n */\nexport class LRUCache implements Map {\n // properties coming in from the options of these, only max and maxSize\n // really *need* to be protected. The rest can be modified, as they just\n // set defaults for various methods.\n readonly #max: LRUCache.Count\n readonly #maxSize: LRUCache.Size\n readonly #dispose?: LRUCache.Disposer\n readonly #disposeAfter?: LRUCache.Disposer\n readonly #fetchMethod?: LRUCache.Fetcher\n\n /**\n * {@link LRUCache.OptionsBase.ttl}\n */\n ttl: LRUCache.Milliseconds\n\n /**\n * {@link LRUCache.OptionsBase.ttlResolution}\n */\n ttlResolution: LRUCache.Milliseconds\n /**\n * {@link LRUCache.OptionsBase.ttlAutopurge}\n */\n ttlAutopurge: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnGet}\n */\n updateAgeOnGet: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnHas}\n */\n updateAgeOnHas: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStale}\n */\n allowStale: boolean\n\n /**\n * {@link LRUCache.OptionsBase.noDisposeOnSet}\n */\n noDisposeOnSet: boolean\n /**\n * {@link LRUCache.OptionsBase.noUpdateTTL}\n */\n noUpdateTTL: boolean\n /**\n * {@link LRUCache.OptionsBase.maxEntrySize}\n */\n maxEntrySize: LRUCache.Size\n /**\n * {@link LRUCache.OptionsBase.sizeCalculation}\n */\n sizeCalculation?: LRUCache.SizeCalculator\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection}\n */\n noDeleteOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnStaleGet}\n */\n noDeleteOnStaleGet: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort}\n */\n allowStaleOnFetchAbort: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection}\n */\n allowStaleOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.ignoreFetchAbort}\n */\n ignoreFetchAbort: boolean\n\n // computed properties\n #size: LRUCache.Count\n #calculatedSize: LRUCache.Size\n #keyMap: Map\n #keyList: (K | undefined)[]\n #valList: (V | BackgroundFetch | undefined)[]\n #next: NumberArray\n #prev: NumberArray\n #head: Index\n #tail: Index\n #free: StackLike\n #disposed?: DisposeTask[]\n #sizes?: ZeroArray\n #starts?: ZeroArray\n #ttls?: ZeroArray\n\n #hasDispose: boolean\n #hasFetchMethod: boolean\n #hasDisposeAfter: boolean\n\n /**\n * Do not call this method unless you need to inspect the\n * inner workings of the cache. If anything returned by this\n * object is modified in any way, strange breakage may occur.\n *\n * These fields are private for a reason!\n *\n * @internal\n */\n static unsafeExposeInternals<\n K extends {},\n V extends {},\n FC extends unknown = unknown\n >(c: LRUCache) {\n return {\n // properties\n starts: c.#starts,\n ttls: c.#ttls,\n sizes: c.#sizes,\n keyMap: c.#keyMap as Map,\n keyList: c.#keyList,\n valList: c.#valList,\n next: c.#next,\n prev: c.#prev,\n get head() {\n return c.#head\n },\n get tail() {\n return c.#tail\n },\n free: c.#free,\n // methods\n isBackgroundFetch: (p: any) => c.#isBackgroundFetch(p),\n backgroundFetch: (\n k: K,\n index: number | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch =>\n c.#backgroundFetch(\n k,\n index as Index | undefined,\n options,\n context\n ),\n moveToTail: (index: number): void =>\n c.#moveToTail(index as Index),\n indexes: (options?: { allowStale: boolean }) =>\n c.#indexes(options),\n rindexes: (options?: { allowStale: boolean }) =>\n c.#rindexes(options),\n isStale: (index: number | undefined) =>\n c.#isStale(index as Index),\n }\n }\n\n // Protected read-only members\n\n /**\n * {@link LRUCache.OptionsBase.max} (read-only)\n */\n get max(): LRUCache.Count {\n return this.#max\n }\n /**\n * {@link LRUCache.OptionsBase.maxSize} (read-only)\n */\n get maxSize(): LRUCache.Count {\n return this.#maxSize\n }\n /**\n * The total computed size of items in the cache (read-only)\n */\n get calculatedSize(): LRUCache.Size {\n return this.#calculatedSize\n }\n /**\n * The number of items stored in the cache (read-only)\n */\n get size(): LRUCache.Count {\n return this.#size\n }\n /**\n * {@link LRUCache.OptionsBase.fetchMethod} (read-only)\n */\n get fetchMethod(): LRUCache.Fetcher | undefined {\n return this.#fetchMethod\n }\n /**\n * {@link LRUCache.OptionsBase.dispose} (read-only)\n */\n get dispose() {\n return this.#dispose\n }\n /**\n * {@link LRUCache.OptionsBase.disposeAfter} (read-only)\n */\n get disposeAfter() {\n return this.#disposeAfter\n }\n\n constructor(\n options: LRUCache.Options | LRUCache\n ) {\n const {\n max = 0,\n ttl,\n ttlResolution = 1,\n ttlAutopurge,\n updateAgeOnGet,\n updateAgeOnHas,\n allowStale,\n dispose,\n disposeAfter,\n noDisposeOnSet,\n noUpdateTTL,\n maxSize = 0,\n maxEntrySize = 0,\n sizeCalculation,\n fetchMethod,\n noDeleteOnFetchRejection,\n noDeleteOnStaleGet,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n } = options\n\n if (max !== 0 && !isPosInt(max)) {\n throw new TypeError('max option must be a nonnegative integer')\n }\n\n const UintArray = max ? getUintArray(max) : Array\n if (!UintArray) {\n throw new Error('invalid max value: ' + max)\n }\n\n this.#max = max\n this.#maxSize = maxSize\n this.maxEntrySize = maxEntrySize || this.#maxSize\n this.sizeCalculation = sizeCalculation\n if (this.sizeCalculation) {\n if (!this.#maxSize && !this.maxEntrySize) {\n throw new TypeError(\n 'cannot set sizeCalculation without setting maxSize or maxEntrySize'\n )\n }\n if (typeof this.sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation set to non-function')\n }\n }\n\n if (\n fetchMethod !== undefined &&\n typeof fetchMethod !== 'function'\n ) {\n throw new TypeError(\n 'fetchMethod must be a function if specified'\n )\n }\n this.#fetchMethod = fetchMethod\n this.#hasFetchMethod = !!fetchMethod\n\n this.#keyMap = new Map()\n this.#keyList = new Array(max).fill(undefined)\n this.#valList = new Array(max).fill(undefined)\n this.#next = new UintArray(max)\n this.#prev = new UintArray(max)\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free = Stack.create(max)\n this.#size = 0\n this.#calculatedSize = 0\n\n if (typeof dispose === 'function') {\n this.#dispose = dispose\n }\n if (typeof disposeAfter === 'function') {\n this.#disposeAfter = disposeAfter\n this.#disposed = []\n } else {\n this.#disposeAfter = undefined\n this.#disposed = undefined\n }\n this.#hasDispose = !!this.#dispose\n this.#hasDisposeAfter = !!this.#disposeAfter\n\n this.noDisposeOnSet = !!noDisposeOnSet\n this.noUpdateTTL = !!noUpdateTTL\n this.noDeleteOnFetchRejection = !!noDeleteOnFetchRejection\n this.allowStaleOnFetchRejection = !!allowStaleOnFetchRejection\n this.allowStaleOnFetchAbort = !!allowStaleOnFetchAbort\n this.ignoreFetchAbort = !!ignoreFetchAbort\n\n // NB: maxEntrySize is set to maxSize if it's set\n if (this.maxEntrySize !== 0) {\n if (this.#maxSize !== 0) {\n if (!isPosInt(this.#maxSize)) {\n throw new TypeError(\n 'maxSize must be a positive integer if specified'\n )\n }\n }\n if (!isPosInt(this.maxEntrySize)) {\n throw new TypeError(\n 'maxEntrySize must be a positive integer if specified'\n )\n }\n this.#initializeSizeTracking()\n }\n\n this.allowStale = !!allowStale\n this.noDeleteOnStaleGet = !!noDeleteOnStaleGet\n this.updateAgeOnGet = !!updateAgeOnGet\n this.updateAgeOnHas = !!updateAgeOnHas\n this.ttlResolution =\n isPosInt(ttlResolution) || ttlResolution === 0\n ? ttlResolution\n : 1\n this.ttlAutopurge = !!ttlAutopurge\n this.ttl = ttl || 0\n if (this.ttl) {\n if (!isPosInt(this.ttl)) {\n throw new TypeError(\n 'ttl must be a positive integer if specified'\n )\n }\n this.#initializeTTLTracking()\n }\n\n // do not allow completely unbounded caches\n if (this.#max === 0 && this.ttl === 0 && this.#maxSize === 0) {\n throw new TypeError(\n 'At least one of max, maxSize, or ttl is required'\n )\n }\n if (!this.ttlAutopurge && !this.#max && !this.#maxSize) {\n const code = 'LRU_CACHE_UNBOUNDED'\n if (shouldWarn(code)) {\n warned.add(code)\n const msg =\n 'TTL caching without ttlAutopurge, max, or maxSize can ' +\n 'result in unbounded memory consumption.'\n emitWarning(msg, 'UnboundedCacheWarning', code, LRUCache)\n }\n }\n }\n\n /**\n * Return the remaining TTL time for a given entry key\n */\n getRemainingTTL(key: K) {\n return this.#keyMap.has(key) ? Infinity : 0\n }\n\n #initializeTTLTracking() {\n const ttls = new ZeroArray(this.#max)\n const starts = new ZeroArray(this.#max)\n this.#ttls = ttls\n this.#starts = starts\n\n this.#setItemTTL = (index, ttl, start = perf.now()) => {\n starts[index] = ttl !== 0 ? start : 0\n ttls[index] = ttl\n if (ttl !== 0 && this.ttlAutopurge) {\n const t = setTimeout(() => {\n if (this.#isStale(index)) {\n this.delete(this.#keyList[index] as K)\n }\n }, ttl + 1)\n // unref() not supported on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n }\n\n this.#updateItemAge = index => {\n starts[index] = ttls[index] !== 0 ? perf.now() : 0\n }\n\n this.#statusTTL = (status, index) => {\n if (ttls[index]) {\n const ttl = ttls[index]\n const start = starts[index]\n /* c8 ignore next */\n if (!ttl || !start) return\n status.ttl = ttl\n status.start = start\n status.now = cachedNow || getNow()\n const age = status.now - start\n status.remainingTTL = ttl - age\n }\n }\n\n // debounce calls to perf.now() to 1s so we're not hitting\n // that costly call repeatedly.\n let cachedNow = 0\n const getNow = () => {\n const n = perf.now()\n if (this.ttlResolution > 0) {\n cachedNow = n\n const t = setTimeout(\n () => (cachedNow = 0),\n this.ttlResolution\n )\n // not available on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n return n\n }\n\n this.getRemainingTTL = key => {\n const index = this.#keyMap.get(key)\n if (index === undefined) {\n return 0\n }\n const ttl = ttls[index]\n const start = starts[index]\n if (!ttl || !start) {\n return Infinity\n }\n const age = (cachedNow || getNow()) - start\n return ttl - age\n }\n\n this.#isStale = index => {\n const s = starts[index]\n const t = ttls[index]\n return !!t && !!s && (cachedNow || getNow()) - s > t\n }\n }\n\n // conditionally set private methods related to TTL\n #updateItemAge: (index: Index) => void = () => {}\n #statusTTL: (status: LRUCache.Status, index: Index) => void =\n () => {}\n #setItemTTL: (\n index: Index,\n ttl: LRUCache.Milliseconds,\n start?: LRUCache.Milliseconds\n // ignore because we never call this if we're not already in TTL mode\n /* c8 ignore start */\n ) => void = () => {}\n /* c8 ignore stop */\n\n #isStale: (index: Index) => boolean = () => false\n\n #initializeSizeTracking() {\n const sizes = new ZeroArray(this.#max)\n this.#calculatedSize = 0\n this.#sizes = sizes\n this.#removeItemSize = index => {\n this.#calculatedSize -= sizes[index] as number\n sizes[index] = 0\n }\n this.#requireSize = (k, v, size, sizeCalculation) => {\n // provisionally accept background fetches.\n // actual value size will be checked when they return.\n if (this.#isBackgroundFetch(v)) {\n return 0\n }\n if (!isPosInt(size)) {\n if (sizeCalculation) {\n if (typeof sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation must be a function')\n }\n size = sizeCalculation(v, k)\n if (!isPosInt(size)) {\n throw new TypeError(\n 'sizeCalculation return invalid (expect positive integer)'\n )\n }\n } else {\n throw new TypeError(\n 'invalid size value (must be positive integer). ' +\n 'When maxSize or maxEntrySize is used, sizeCalculation ' +\n 'or size must be set.'\n )\n }\n }\n return size\n }\n this.#addItemSize = (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => {\n sizes[index] = size\n if (this.#maxSize) {\n const maxSize = this.#maxSize - (sizes[index] as number)\n while (this.#calculatedSize > maxSize) {\n this.#evict(true)\n }\n }\n this.#calculatedSize += sizes[index] as number\n if (status) {\n status.entrySize = size\n status.totalCalculatedSize = this.#calculatedSize\n }\n }\n }\n\n #removeItemSize: (index: Index) => void = _i => {}\n #addItemSize: (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => void = (_i, _s, _st) => {}\n #requireSize: (\n k: K,\n v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => LRUCache.Size = (\n _k: K,\n _v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => {\n if (size || sizeCalculation) {\n throw new TypeError(\n 'cannot set size without setting maxSize or maxEntrySize on cache'\n )\n }\n return 0\n };\n\n *#indexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#tail; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#head) {\n break\n } else {\n i = this.#prev[i] as Index\n }\n }\n }\n }\n\n *#rindexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#head; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#tail) {\n break\n } else {\n i = this.#next[i] as Index\n }\n }\n }\n }\n\n #isValidIndex(index: Index) {\n return (\n index !== undefined &&\n this.#keyMap.get(this.#keyList[index] as K) === index\n )\n }\n\n /**\n * Return a generator yielding `[key, value]` pairs,\n * in order from most recently used to least recently used.\n */\n *entries() {\n for (const i of this.#indexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]] as [K, V]\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.entries}\n *\n * Return a generator yielding `[key, value]` pairs,\n * in order from least recently used to most recently used.\n */\n *rentries() {\n for (const i of this.#rindexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]]\n }\n }\n }\n\n /**\n * Return a generator yielding the keys in the cache,\n * in order from most recently used to least recently used.\n */\n *keys() {\n for (const i of this.#indexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.keys}\n *\n * Return a generator yielding the keys in the cache,\n * in order from least recently used to most recently used.\n */\n *rkeys() {\n for (const i of this.#rindexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Return a generator yielding the values in the cache,\n * in order from most recently used to least recently used.\n */\n *values() {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i] as V\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.values}\n *\n * Return a generator yielding the values in the cache,\n * in order from least recently used to most recently used.\n */\n *rvalues() {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i]\n }\n }\n }\n\n /**\n * Iterating over the cache itself yields the same results as\n * {@link LRUCache.entries}\n */\n [Symbol.iterator]() {\n return this.entries()\n }\n\n /**\n * A String value that is used in the creation of the default string description of an object.\n * Called by the built-in method Object.prototype.toString.\n */\n [Symbol.toStringTag] = 'LRUCache'\n\n /**\n * Find a value for which the supplied fn method returns a truthy value,\n * similar to Array.find(). fn is called as fn(value, key, cache).\n */\n find(\n fn: (v: V, k: K, self: LRUCache) => boolean,\n getOptions: LRUCache.GetOptions = {}\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n if (fn(value, this.#keyList[i] as K, this)) {\n return this.get(this.#keyList[i] as K, getOptions)\n }\n }\n }\n\n /**\n * Call the supplied function on each item in the cache, in order from\n * most recently used to least recently used. fn is called as\n * fn(value, key, cache). Does not update age or recenty of use.\n * Does not iterate over stale values.\n */\n forEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * The same as {@link LRUCache.forEach} but items are iterated over in\n * reverse order. (ie, less recently used items are iterated over first.)\n */\n rforEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * Delete any stale entries. Returns true if anything was removed,\n * false otherwise.\n */\n purgeStale() {\n let deleted = false\n for (const i of this.#rindexes({ allowStale: true })) {\n if (this.#isStale(i)) {\n this.delete(this.#keyList[i] as K)\n deleted = true\n }\n }\n return deleted\n }\n\n /**\n * Get the extended info about a given entry, to get its value, size, and\n * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a\n * single key. Always returns stale values, if their info is found in the\n * cache, so be sure to check for expired TTLs if relevant.\n */\n info(key: K): LRUCache.Entry | undefined {\n const i = this.#keyMap.get(key)\n if (i === undefined) return undefined\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) return undefined\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n const ttl = this.#ttls[i]\n const start = this.#starts[i]\n if (ttl && start) {\n const remain = ttl - (perf.now() - start)\n entry.ttl = remain\n entry.start = Date.now()\n }\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n return entry\n }\n\n /**\n * Return an array of [key, {@link LRUCache.Entry}] tuples which can be\n * passed to cache.load()\n */\n dump() {\n const arr: [K, LRUCache.Entry][] = []\n for (const i of this.#indexes({ allowStale: true })) {\n const key = this.#keyList[i]\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined || key === undefined) continue\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n entry.ttl = this.#ttls[i]\n // always dump the start relative to a portable timestamp\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = perf.now() - (this.#starts[i] as number)\n entry.start = Math.floor(Date.now() - age)\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n arr.unshift([key, entry])\n }\n return arr\n }\n\n /**\n * Reset the cache and load in the items in entries in the order listed.\n * Note that the shape of the resulting cache may be different if the\n * same options are not used in both caches.\n */\n load(arr: [K, LRUCache.Entry][]) {\n this.clear()\n for (const [key, entry] of arr) {\n if (entry.start) {\n // entry.start is a portable timestamp, but we may be using\n // node's performance.now(), so calculate the offset, so that\n // we get the intended remaining TTL, no matter how long it's\n // been on ice.\n //\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = Date.now() - entry.start\n entry.start = perf.now() - age\n }\n this.set(key, entry.value, entry)\n }\n }\n\n /**\n * Add a value to the cache.\n *\n * Note: if `undefined` is specified as a value, this is an alias for\n * {@link LRUCache#delete}\n */\n set(\n k: K,\n v: V | BackgroundFetch | undefined,\n setOptions: LRUCache.SetOptions = {}\n ) {\n if (v === undefined) {\n this.delete(k)\n return this\n }\n const {\n ttl = this.ttl,\n start,\n noDisposeOnSet = this.noDisposeOnSet,\n sizeCalculation = this.sizeCalculation,\n status,\n } = setOptions\n let { noUpdateTTL = this.noUpdateTTL } = setOptions\n\n const size = this.#requireSize(\n k,\n v,\n setOptions.size || 0,\n sizeCalculation\n )\n // if the item doesn't fit, don't do anything\n // NB: maxEntrySize set to maxSize by default\n if (this.maxEntrySize && size > this.maxEntrySize) {\n if (status) {\n status.set = 'miss'\n status.maxEntrySizeExceeded = true\n }\n // have to delete, in case something is there already.\n this.delete(k)\n return this\n }\n let index = this.#size === 0 ? undefined : this.#keyMap.get(k)\n if (index === undefined) {\n // addition\n index = (\n this.#size === 0\n ? this.#tail\n : this.#free.length !== 0\n ? this.#free.pop()\n : this.#size === this.#max\n ? this.#evict(false)\n : this.#size\n ) as Index\n this.#keyList[index] = k\n this.#valList[index] = v\n this.#keyMap.set(k, index)\n this.#next[this.#tail] = index\n this.#prev[index] = this.#tail\n this.#tail = index\n this.#size++\n this.#addItemSize(index, size, status)\n if (status) status.set = 'add'\n noUpdateTTL = false\n } else {\n // update\n this.#moveToTail(index)\n const oldVal = this.#valList[index] as V | BackgroundFetch\n if (v !== oldVal) {\n if (this.#hasFetchMethod && this.#isBackgroundFetch(oldVal)) {\n oldVal.__abortController.abort(new Error('replaced'))\n const { __staleWhileFetching: s } = oldVal\n if (s !== undefined && !noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(s as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([s as V, k, 'set'])\n }\n }\n } else if (!noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(oldVal as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([oldVal as V, k, 'set'])\n }\n }\n this.#removeItemSize(index)\n this.#addItemSize(index, size, status)\n this.#valList[index] = v\n if (status) {\n status.set = 'replace'\n const oldValue =\n oldVal && this.#isBackgroundFetch(oldVal)\n ? oldVal.__staleWhileFetching\n : oldVal\n if (oldValue !== undefined) status.oldValue = oldValue\n }\n } else if (status) {\n status.set = 'update'\n }\n }\n if (ttl !== 0 && !this.#ttls) {\n this.#initializeTTLTracking()\n }\n if (this.#ttls) {\n if (!noUpdateTTL) {\n this.#setItemTTL(index, ttl, start)\n }\n if (status) this.#statusTTL(status, index)\n }\n if (!noDisposeOnSet && this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return this\n }\n\n /**\n * Evict the least recently used item, returning its value or\n * `undefined` if cache is empty.\n */\n pop(): V | undefined {\n try {\n while (this.#size) {\n const val = this.#valList[this.#head]\n this.#evict(true)\n if (this.#isBackgroundFetch(val)) {\n if (val.__staleWhileFetching) {\n return val.__staleWhileFetching\n }\n } else if (val !== undefined) {\n return val\n }\n }\n } finally {\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n }\n\n #evict(free: boolean) {\n const head = this.#head\n const k = this.#keyList[head] as K\n const v = this.#valList[head] as V\n if (this.#hasFetchMethod && this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('evicted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v, k, 'evict')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v, k, 'evict'])\n }\n }\n this.#removeItemSize(head)\n // if we aren't about to use the index, then null these out\n if (free) {\n this.#keyList[head] = undefined\n this.#valList[head] = undefined\n this.#free.push(head)\n }\n if (this.#size === 1) {\n this.#head = this.#tail = 0 as Index\n this.#free.length = 0\n } else {\n this.#head = this.#next[head] as Index\n }\n this.#keyMap.delete(k)\n this.#size--\n return head\n }\n\n /**\n * Check if a key is in the cache, without updating the recency of use.\n * Will return false if the item is stale, even though it is technically\n * in the cache.\n *\n * Will not update item age unless\n * {@link LRUCache.OptionsBase.updateAgeOnHas} is set.\n */\n has(k: K, hasOptions: LRUCache.HasOptions = {}) {\n const { updateAgeOnHas = this.updateAgeOnHas, status } =\n hasOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const v = this.#valList[index]\n if (\n this.#isBackgroundFetch(v) &&\n v.__staleWhileFetching === undefined\n ) {\n return false\n }\n if (!this.#isStale(index)) {\n if (updateAgeOnHas) {\n this.#updateItemAge(index)\n }\n if (status) {\n status.has = 'hit'\n this.#statusTTL(status, index)\n }\n return true\n } else if (status) {\n status.has = 'stale'\n this.#statusTTL(status, index)\n }\n } else if (status) {\n status.has = 'miss'\n }\n return false\n }\n\n /**\n * Like {@link LRUCache#get} but doesn't update recency or delete stale\n * items.\n *\n * Returns `undefined` if the item is stale, unless\n * {@link LRUCache.OptionsBase.allowStale} is set.\n */\n peek(k: K, peekOptions: LRUCache.PeekOptions = {}) {\n const { allowStale = this.allowStale } = peekOptions\n const index = this.#keyMap.get(k)\n if (\n index === undefined ||\n (!allowStale && this.#isStale(index))\n ) {\n return\n }\n const v = this.#valList[index]\n // either stale and allowed, or forcing a refresh of non-stale value\n return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v\n }\n\n #backgroundFetch(\n k: K,\n index: Index | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch {\n const v = index === undefined ? undefined : this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n return v\n }\n\n const ac = new AC()\n const { signal } = options\n // when/if our AC signals, then stop listening to theirs.\n signal?.addEventListener('abort', () => ac.abort(signal.reason), {\n signal: ac.signal,\n })\n\n const fetchOpts = {\n signal: ac.signal,\n options,\n context,\n }\n\n const cb = (\n v: V | undefined,\n updateCache = false\n ): V | undefined => {\n const { aborted } = ac.signal\n const ignoreAbort = options.ignoreFetchAbort && v !== undefined\n if (options.status) {\n if (aborted && !updateCache) {\n options.status.fetchAborted = true\n options.status.fetchError = ac.signal.reason\n if (ignoreAbort) options.status.fetchAbortIgnored = true\n } else {\n options.status.fetchResolved = true\n }\n }\n if (aborted && !ignoreAbort && !updateCache) {\n return fetchFail(ac.signal.reason)\n }\n // either we didn't abort, and are still here, or we did, and ignored\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n if (v === undefined) {\n if (bf.__staleWhileFetching) {\n this.#valList[index as Index] = bf.__staleWhileFetching\n } else {\n this.delete(k)\n }\n } else {\n if (options.status) options.status.fetchUpdated = true\n this.set(k, v, fetchOpts.options)\n }\n }\n return v\n }\n\n const eb = (er: any) => {\n if (options.status) {\n options.status.fetchRejected = true\n options.status.fetchError = er\n }\n return fetchFail(er)\n }\n\n const fetchFail = (er: any): V | undefined => {\n const { aborted } = ac.signal\n const allowStaleAborted =\n aborted && options.allowStaleOnFetchAbort\n const allowStale =\n allowStaleAborted || options.allowStaleOnFetchRejection\n const noDelete = allowStale || options.noDeleteOnFetchRejection\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n // if we allow stale on fetch rejections, then we need to ensure that\n // the stale value is not removed from the cache when the fetch fails.\n const del = !noDelete || bf.__staleWhileFetching === undefined\n if (del) {\n this.delete(k)\n } else if (!allowStaleAborted) {\n // still replace the *promise* with the stale value,\n // since we are done with the promise at this point.\n // leave it untouched if we're still waiting for an\n // aborted background fetch that hasn't yet returned.\n this.#valList[index as Index] = bf.__staleWhileFetching\n }\n }\n if (allowStale) {\n if (options.status && bf.__staleWhileFetching !== undefined) {\n options.status.returnedStale = true\n }\n return bf.__staleWhileFetching\n } else if (bf.__returned === bf) {\n throw er\n }\n }\n\n const pcall = (\n res: (v: V | undefined) => void,\n rej: (e: any) => void\n ) => {\n const fmp = this.#fetchMethod?.(k, v, fetchOpts)\n if (fmp && fmp instanceof Promise) {\n fmp.then(v => res(v === undefined ? undefined : v), rej)\n }\n // ignored, we go until we finish, regardless.\n // defer check until we are actually aborting,\n // so fetchMethod can override.\n ac.signal.addEventListener('abort', () => {\n if (\n !options.ignoreFetchAbort ||\n options.allowStaleOnFetchAbort\n ) {\n res(undefined)\n // when it eventually resolves, update the cache.\n if (options.allowStaleOnFetchAbort) {\n res = v => cb(v, true)\n }\n }\n })\n }\n\n if (options.status) options.status.fetchDispatched = true\n const p = new Promise(pcall).then(cb, eb)\n const bf: BackgroundFetch = Object.assign(p, {\n __abortController: ac,\n __staleWhileFetching: v,\n __returned: undefined,\n })\n\n if (index === undefined) {\n // internal, don't expose status.\n this.set(k, bf, { ...fetchOpts.options, status: undefined })\n index = this.#keyMap.get(k)\n } else {\n this.#valList[index] = bf\n }\n return bf\n }\n\n #isBackgroundFetch(p: any): p is BackgroundFetch {\n if (!this.#hasFetchMethod) return false\n const b = p as BackgroundFetch\n return (\n !!b &&\n b instanceof Promise &&\n b.hasOwnProperty('__staleWhileFetching') &&\n b.__abortController instanceof AC\n )\n }\n\n /**\n * Make an asynchronous cached fetch using the\n * {@link LRUCache.OptionsBase.fetchMethod} function.\n *\n * If multiple fetches for the same key are issued, then they will all be\n * coalesced into a single call to fetchMethod.\n *\n * Note that this means that handling options such as\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort},\n * {@link LRUCache.FetchOptions.signal},\n * and {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} will be\n * determined by the FIRST fetch() call for a given key.\n *\n * This is a known (fixable) shortcoming which will be addresed on when\n * someone complains about it, as the fix would involve added complexity and\n * may not be worth the costs for this edge case.\n */\n fetch(\n k: K,\n fetchOptions: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : LRUCache.FetchOptionsWithContext\n ): Promise\n // this overload not allowed if context is required\n fetch(\n k: unknown extends FC\n ? K\n : FC extends undefined | void\n ? K\n : never,\n fetchOptions?: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : never\n ): Promise\n async fetch(\n k: K,\n fetchOptions: LRUCache.FetchOptions = {}\n ): Promise {\n const {\n // get options\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n // set options\n ttl = this.ttl,\n noDisposeOnSet = this.noDisposeOnSet,\n size = 0,\n sizeCalculation = this.sizeCalculation,\n noUpdateTTL = this.noUpdateTTL,\n // fetch exclusive options\n noDeleteOnFetchRejection = this.noDeleteOnFetchRejection,\n allowStaleOnFetchRejection = this.allowStaleOnFetchRejection,\n ignoreFetchAbort = this.ignoreFetchAbort,\n allowStaleOnFetchAbort = this.allowStaleOnFetchAbort,\n context,\n forceRefresh = false,\n status,\n signal,\n } = fetchOptions\n\n if (!this.#hasFetchMethod) {\n if (status) status.fetch = 'get'\n return this.get(k, {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n status,\n })\n }\n\n const options = {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n ttl,\n noDisposeOnSet,\n size,\n sizeCalculation,\n noUpdateTTL,\n noDeleteOnFetchRejection,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n status,\n signal,\n }\n\n let index = this.#keyMap.get(k)\n if (index === undefined) {\n if (status) status.fetch = 'miss'\n const p = this.#backgroundFetch(k, index, options, context)\n return (p.__returned = p)\n } else {\n // in cache, maybe already fetching\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n const stale =\n allowStale && v.__staleWhileFetching !== undefined\n if (status) {\n status.fetch = 'inflight'\n if (stale) status.returnedStale = true\n }\n return stale ? v.__staleWhileFetching : (v.__returned = v)\n }\n\n // if we force a refresh, that means do NOT serve the cached value,\n // unless we are already in the process of refreshing the cache.\n const isStale = this.#isStale(index)\n if (!forceRefresh && !isStale) {\n if (status) status.fetch = 'hit'\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n if (status) this.#statusTTL(status, index)\n return v\n }\n\n // ok, it is stale or a forced refresh, and not already fetching.\n // refresh the cache.\n const p = this.#backgroundFetch(k, index, options, context)\n const hasStale = p.__staleWhileFetching !== undefined\n const staleVal = hasStale && allowStale\n if (status) {\n status.fetch = isStale ? 'stale' : 'refresh'\n if (staleVal && isStale) status.returnedStale = true\n }\n return staleVal ? p.__staleWhileFetching : (p.__returned = p)\n }\n }\n\n /**\n * Return a value from the cache. Will update the recency of the cache\n * entry found.\n *\n * If the key is not found, get() will return `undefined`.\n */\n get(k: K, getOptions: LRUCache.GetOptions = {}) {\n const {\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n status,\n } = getOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const value = this.#valList[index]\n const fetching = this.#isBackgroundFetch(value)\n if (status) this.#statusTTL(status, index)\n if (this.#isStale(index)) {\n if (status) status.get = 'stale'\n // delete only if not an in-flight background fetch\n if (!fetching) {\n if (!noDeleteOnStaleGet) {\n this.delete(k)\n }\n if (status && allowStale) status.returnedStale = true\n return allowStale ? value : undefined\n } else {\n if (\n status &&\n allowStale &&\n value.__staleWhileFetching !== undefined\n ) {\n status.returnedStale = true\n }\n return allowStale ? value.__staleWhileFetching : undefined\n }\n } else {\n if (status) status.get = 'hit'\n // if we're currently fetching it, we don't actually have it yet\n // it's not stale, which means this isn't a staleWhileRefetching.\n // If it's not stale, and fetching, AND has a __staleWhileFetching\n // value, then that means the user fetched with {forceRefresh:true},\n // so it's safe to return that value.\n if (fetching) {\n return value.__staleWhileFetching\n }\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n return value\n }\n } else if (status) {\n status.get = 'miss'\n }\n }\n\n #connect(p: Index, n: Index) {\n this.#prev[n] = p\n this.#next[p] = n\n }\n\n #moveToTail(index: Index): void {\n // if tail already, nothing to do\n // if head, move head to next[index]\n // else\n // move next[prev[index]] to next[index] (head has no prev)\n // move prev[next[index]] to prev[index]\n // prev[index] = tail\n // next[tail] = index\n // tail = index\n if (index !== this.#tail) {\n if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n this.#connect(\n this.#prev[index] as Index,\n this.#next[index] as Index\n )\n }\n this.#connect(this.#tail, index)\n this.#tail = index\n }\n }\n\n /**\n * Deletes a key out of the cache.\n * Returns true if the key was deleted, false otherwise.\n */\n delete(k: K) {\n let deleted = false\n if (this.#size !== 0) {\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n deleted = true\n if (this.#size === 1) {\n this.clear()\n } else {\n this.#removeItemSize(index)\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k, 'delete'])\n }\n }\n this.#keyMap.delete(k)\n this.#keyList[index] = undefined\n this.#valList[index] = undefined\n if (index === this.#tail) {\n this.#tail = this.#prev[index] as Index\n } else if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n const pi = this.#prev[index] as number\n this.#next[pi] = this.#next[index] as number\n const ni = this.#next[index] as number\n this.#prev[ni] = this.#prev[index] as number\n }\n this.#size--\n this.#free.push(index)\n }\n }\n }\n if (this.#hasDisposeAfter && this.#disposed?.length) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return deleted\n }\n\n /**\n * Clear the cache entirely, throwing away all values.\n */\n clear() {\n for (const index of this.#rindexes({ allowStale: true })) {\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else {\n const k = this.#keyList[index]\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k as K, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k as K, 'delete'])\n }\n }\n }\n\n this.#keyMap.clear()\n this.#valList.fill(undefined)\n this.#keyList.fill(undefined)\n if (this.#ttls && this.#starts) {\n this.#ttls.fill(0)\n this.#starts.fill(0)\n }\n if (this.#sizes) {\n this.#sizes.fill(0)\n }\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free.length = 0\n this.#calculatedSize = 0\n this.#size = 0\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n}\n\nexport default LRUCache\n"]} \ No newline at end of file diff --git a/dist/commonjs/index.min.js b/dist/commonjs/index.min.js new file mode 100644 index 0000000..b157bc7 --- /dev/null +++ b/dist/commonjs/index.min.js @@ -0,0 +1,2 @@ +"use strict";var G=(o,t,e)=>{if(!t.has(o))throw TypeError("Cannot "+e)};var j=(o,t,e)=>(G(o,t,"read from private field"),e?e.call(o):t.get(o)),I=(o,t,e)=>{if(t.has(o))throw TypeError("Cannot add the same private member more than once");t instanceof WeakSet?t.add(o):t.set(o,e)},D=(o,t,e,i)=>(G(o,t,"write to private field"),i?i.call(o,e):t.set(o,e),e);Object.defineProperty(exports,"__esModule",{value:!0});exports.LRUCache=void 0;var T=typeof performance=="object"&&performance&&typeof performance.now=="function"?performance:Date,N=new Set,L=typeof process=="object"&&process?process:{},P=(o,t,e,i)=>{typeof L.emitWarning=="function"?L.emitWarning(o,t,e,i):console.error(`[${e}] ${t}: ${o}`)},W=globalThis.AbortController,M=globalThis.AbortSignal;if(typeof W>"u"){M=class{onabort;_onabort=[];reason;aborted=!1;addEventListener(i,s){this._onabort.push(s)}},W=class{constructor(){t()}signal=new M;abort(i){if(!this.signal.aborted){this.signal.reason=i,this.signal.aborted=!0;for(let s of this.signal._onabort)s(i);this.signal.onabort?.(i)}}};let o=L.env?.LRU_CACHE_IGNORE_AC_WARNING!=="1",t=()=>{o&&(o=!1,P("AbortController is not defined. 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C=class{#g;#f;#p;#w;#C;ttl;ttlResolution;ttlAutopurge;updateAgeOnGet;updateAgeOnHas;allowStale;noDisposeOnSet;noUpdateTTL;maxEntrySize;sizeCalculation;noDeleteOnFetchRejection;noDeleteOnStaleGet;allowStaleOnFetchAbort;allowStaleOnFetchRejection;ignoreFetchAbort;#n;#S;#s;#i;#t;#l;#c;#o;#h;#_;#r;#b;#y;#u;#m;#T;#a;static unsafeExposeInternals(t){return{starts:t.#y,ttls:t.#u,sizes:t.#b,keyMap:t.#s,keyList:t.#i,valList:t.#t,next:t.#l,prev:t.#c,get head(){return t.#o},get tail(){return t.#h},free:t.#_,isBackgroundFetch:e=>t.#e(e),backgroundFetch:(e,i,s,n)=>t.#D(e,i,s,n),moveToTail:e=>t.#v(e),indexes:e=>t.#A(e),rindexes:e=>t.#F(e),isStale:e=>t.#d(e)}}get max(){return this.#g}get maxSize(){return this.#f}get calculatedSize(){return this.#S}get size(){return this.#n}get fetchMethod(){return this.#C}get dispose(){return this.#p}get disposeAfter(){return 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y={allowStale:i,updateAgeOnGet:s,noDeleteOnStaleGet:n,ttl:h,noDisposeOnSet:l,size:r,sizeCalculation:g,noUpdateTTL:b,noDeleteOnFetchRejection:f,allowStaleOnFetchRejection:u,allowStaleOnFetchAbort:F,ignoreFetchAbort:c,status:a,signal:w},p=this.#s.get(t);if(p===void 0){a&&(a.fetch="miss");let _=this.#D(t,p,y,d);return _.__returned=_}else{let _=this.#t[p];if(this.#e(_)){let x=i&&_.__staleWhileFetching!==void 0;return a&&(a.fetch="inflight",x&&(a.returnedStale=!0)),x?_.__staleWhileFetching:_.__returned=_}let O=this.#d(p);if(!S&&!O)return a&&(a.fetch="hit"),this.#v(p),s&&this.#z(p),a&&this.#O(a,p),_;let m=this.#D(t,p,y,d),U=m.__staleWhileFetching!==void 0&&i;return a&&(a.fetch=O?"stale":"refresh",U&&O&&(a.returnedStale=!0)),U?m.__staleWhileFetching:m.__returned=m}}get(t,e={}){let{allowStale:i=this.allowStale,updateAgeOnGet:s=this.updateAgeOnGet,noDeleteOnStaleGet:n=this.noDeleteOnStaleGet,status:h}=e,l=this.#s.get(t);if(l!==void 0){let r=this.#t[l],g=this.#e(r);return h&&this.#O(h,l),this.#d(l)?(h&&(h.get="stale"),g?(h&&i&&r.__staleWhileFetching!==void 0&&(h.returnedStale=!0),i?r.__staleWhileFetching:void 0):(n||this.delete(t),h&&i&&(h.returnedStale=!0),i?r:void 0)):(h&&(h.get="hit"),g?r.__staleWhileFetching:(this.#v(l),s&&this.#z(l),r))}else h&&(h.get="miss")}#j(t,e){this.#c[e]=t,this.#l[t]=e}#v(t){t!==this.#h&&(t===this.#o?this.#o=this.#l[t]:this.#j(this.#c[t],this.#l[t]),this.#j(this.#h,t),this.#h=t)}delete(t){let e=!1;if(this.#n!==0){let i=this.#s.get(t);if(i!==void 0)if(e=!0,this.#n===1)this.clear();else{this.#E(i);let s=this.#t[i];if(this.#e(s)?s.__abortController.abort(new Error("deleted")):(this.#m||this.#a)&&(this.#m&&this.#p?.(s,t,"delete"),this.#a&&this.#r?.push([s,t,"delete"])),this.#s.delete(t),this.#i[i]=void 0,this.#t[i]=void 0,i===this.#h)this.#h=this.#c[i];else if(i===this.#o)this.#o=this.#l[i];else{let n=this.#c[i];this.#l[n]=this.#l[i];let h=this.#l[i];this.#c[h]=this.#c[i]}this.#n--,this.#_.push(i)}}if(this.#a&&this.#r?.length){let i=this.#r,s;for(;s=i?.shift();)this.#w?.(...s)}return e}clear(){for(let t of this.#F({allowStale:!0})){let e=this.#t[t];if(this.#e(e))e.__abortController.abort(new Error("deleted"));else{let i=this.#i[t];this.#m&&this.#p?.(e,i,"delete"),this.#a&&this.#r?.push([e,i,"delete"])}}if(this.#s.clear(),this.#t.fill(void 0),this.#i.fill(void 0),this.#u&&this.#y&&(this.#u.fill(0),this.#y.fill(0)),this.#b&&this.#b.fill(0),this.#o=0,this.#h=0,this.#_.length=0,this.#S=0,this.#n=0,this.#a&&this.#r){let t=this.#r,e;for(;e=t?.shift();)this.#w?.(...e)}}};exports.LRUCache=C;exports.default=C; +//# sourceMappingURL=index.min.js.map diff --git a/dist/commonjs/index.min.js.map b/dist/commonjs/index.min.js.map new file mode 100644 index 0000000..3f8d69f --- /dev/null +++ b/dist/commonjs/index.min.js.map @@ -0,0 +1,7 @@ +{ + "version": 3, + "sources": ["../../src/index.ts"], + "sourcesContent": ["/**\n * @module LRUCache\n */\n\n// module-private names and types\ntype Perf = { now: () => number }\nconst perf: Perf =\n typeof performance === 'object' &&\n performance &&\n typeof performance.now === 'function'\n ? performance\n : Date\n\nconst warned = new Set()\n\n// either a function or a class\ntype ForC = ((...a: any[]) => any) | { new (...a: any[]): any }\n\n/* c8 ignore start */\nconst PROCESS = (\n typeof process === 'object' && !!process ? process : {}\n) as { [k: string]: any }\n/* c8 ignore start */\n\nconst emitWarning = (\n msg: string,\n type: string,\n code: string,\n fn: ForC\n) => {\n typeof PROCESS.emitWarning === 'function'\n ? PROCESS.emitWarning(msg, type, code, fn)\n : console.error(`[${code}] ${type}: ${msg}`)\n}\n\nlet AC = globalThis.AbortController\nlet AS = globalThis.AbortSignal\n\n/* c8 ignore start */\nif (typeof AC === 'undefined') {\n //@ts-ignore\n AS = class AbortSignal {\n onabort?: (...a: any[]) => any\n _onabort: ((...a: any[]) => any)[] = []\n reason?: any\n aborted: boolean = false\n addEventListener(_: string, fn: (...a: any[]) => any) {\n this._onabort.push(fn)\n }\n }\n //@ts-ignore\n AC = class AbortController {\n constructor() {\n warnACPolyfill()\n }\n signal = new AS()\n abort(reason: any) {\n if (this.signal.aborted) return\n //@ts-ignore\n this.signal.reason = reason\n //@ts-ignore\n this.signal.aborted = true\n //@ts-ignore\n for (const fn of this.signal._onabort) {\n fn(reason)\n }\n this.signal.onabort?.(reason)\n }\n }\n let printACPolyfillWarning =\n PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'\n const warnACPolyfill = () => {\n if (!printACPolyfillWarning) return\n printACPolyfillWarning = false\n emitWarning(\n 'AbortController is not defined. If using lru-cache in ' +\n 'node 14, load an AbortController polyfill from the ' +\n '`node-abort-controller` package. A minimal polyfill is ' +\n 'provided for use by LRUCache.fetch(), but it should not be ' +\n 'relied upon in other contexts (eg, passing it to other APIs that ' +\n 'use AbortController/AbortSignal might have undesirable effects). ' +\n 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.',\n 'NO_ABORT_CONTROLLER',\n 'ENOTSUP',\n warnACPolyfill\n )\n }\n}\n/* c8 ignore stop */\n\nconst shouldWarn = (code: string) => !warned.has(code)\n\nconst TYPE = Symbol('type')\nexport type PosInt = number & { [TYPE]: 'Positive Integer' }\nexport type Index = number & { [TYPE]: 'LRUCache Index' }\n\nconst isPosInt = (n: any): n is PosInt =>\n n && n === Math.floor(n) && n > 0 && isFinite(n)\n\nexport type UintArray = Uint8Array | Uint16Array | Uint32Array\nexport type NumberArray = UintArray | number[]\n\n/* c8 ignore start */\n// This is a little bit ridiculous, tbh.\n// The maximum array length is 2^32-1 or thereabouts on most JS impls.\n// And well before that point, you're caching the entire world, I mean,\n// that's ~32GB of just integers for the next/prev links, plus whatever\n// else to hold that many keys and values. Just filling the memory with\n// zeroes at init time is brutal when you get that big.\n// But why not be complete?\n// Maybe in the future, these limits will have expanded.\nconst getUintArray = (max: number) =>\n !isPosInt(max)\n ? null\n : max <= Math.pow(2, 8)\n ? Uint8Array\n : max <= Math.pow(2, 16)\n ? Uint16Array\n : max <= Math.pow(2, 32)\n ? Uint32Array\n : max <= Number.MAX_SAFE_INTEGER\n ? ZeroArray\n : null\n/* c8 ignore stop */\n\nclass ZeroArray extends Array {\n constructor(size: number) {\n super(size)\n this.fill(0)\n }\n}\nexport type { ZeroArray }\nexport type { Stack }\n\nexport type StackLike = Stack | Index[]\nclass Stack {\n heap: NumberArray\n length: number\n // private constructor\n static #constructing: boolean = false\n static create(max: number): StackLike {\n const HeapCls = getUintArray(max)\n if (!HeapCls) return []\n Stack.#constructing = true\n const s = new Stack(max, HeapCls)\n Stack.#constructing = false\n return s\n }\n constructor(\n max: number,\n HeapCls: { new (n: number): NumberArray }\n ) {\n /* c8 ignore start */\n if (!Stack.#constructing) {\n throw new TypeError('instantiate Stack using Stack.create(n)')\n }\n /* c8 ignore stop */\n this.heap = new HeapCls(max)\n this.length = 0\n }\n push(n: Index) {\n this.heap[this.length++] = n\n }\n pop(): Index {\n return this.heap[--this.length] as Index\n }\n}\n\n/**\n * Promise representing an in-progress {@link LRUCache#fetch} call\n */\nexport type BackgroundFetch = Promise & {\n __returned: BackgroundFetch | undefined\n __abortController: AbortController\n __staleWhileFetching: V | undefined\n}\n\nexport type DisposeTask = [\n value: V,\n key: K,\n reason: LRUCache.DisposeReason\n]\n\nexport namespace LRUCache {\n /**\n * An integer greater than 0, reflecting the calculated size of items\n */\n export type Size = number\n\n /**\n * Integer greater than 0, representing some number of milliseconds, or the\n * time at which a TTL started counting from.\n */\n export type Milliseconds = number\n\n /**\n * An integer greater than 0, reflecting a number of items\n */\n export type Count = number\n\n /**\n * The reason why an item was removed from the cache, passed\n * to the {@link Disposer} methods.\n */\n export type DisposeReason = 'evict' | 'set' | 'delete'\n /**\n * A method called upon item removal, passed as the\n * {@link OptionsBase.dispose} and/or\n * {@link OptionsBase.disposeAfter} options.\n */\n export type Disposer = (\n value: V,\n key: K,\n reason: DisposeReason\n ) => void\n\n /**\n * A function that returns the effective calculated size\n * of an entry in the cache.\n */\n export type SizeCalculator = (value: V, key: K) => Size\n\n /**\n * Options provided to the\n * {@link OptionsBase.fetchMethod} function.\n */\n export interface FetcherOptions {\n signal: AbortSignal\n options: FetcherFetchOptions\n /**\n * Object provided in the {@link FetchOptions.context} option to\n * {@link LRUCache#fetch}\n */\n context: FC\n }\n\n /**\n * Status object that may be passed to {@link LRUCache#fetch},\n * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}.\n */\n export interface Status {\n /**\n * The status of a set() operation.\n *\n * - add: the item was not found in the cache, and was added\n * - update: the item was in the cache, with the same value provided\n * - replace: the item was in the cache, and replaced\n * - miss: the item was not added to the cache for some reason\n */\n set?: 'add' | 'update' | 'replace' | 'miss'\n\n /**\n * the ttl stored for the item, or undefined if ttls are not used.\n */\n ttl?: Milliseconds\n\n /**\n * the start time for the item, or undefined if ttls are not used.\n */\n start?: Milliseconds\n\n /**\n * The timestamp used for TTL calculation\n */\n now?: Milliseconds\n\n /**\n * the remaining ttl for the item, or undefined if ttls are not used.\n */\n remainingTTL?: Milliseconds\n\n /**\n * The calculated size for the item, if sizes are used.\n */\n entrySize?: Size\n\n /**\n * The total calculated size of the cache, if sizes are used.\n */\n totalCalculatedSize?: Size\n\n /**\n * A flag indicating that the item was not stored, due to exceeding the\n * {@link OptionsBase.maxEntrySize}\n */\n maxEntrySizeExceeded?: true\n\n /**\n * The old value, specified in the case of `set:'update'` or\n * `set:'replace'`\n */\n oldValue?: V\n\n /**\n * The results of a {@link LRUCache#has} operation\n *\n * - hit: the item was found in the cache\n * - stale: the item was found in the cache, but is stale\n * - miss: the item was not found in the cache\n */\n has?: 'hit' | 'stale' | 'miss'\n\n /**\n * The status of a {@link LRUCache#fetch} operation.\n * Note that this can change as the underlying fetch() moves through\n * various states.\n *\n * - inflight: there is another fetch() for this key which is in process\n * - get: there is no fetchMethod, so {@link LRUCache#get} was called.\n * - miss: the item is not in cache, and will be fetched.\n * - hit: the item is in the cache, and was resolved immediately.\n * - stale: the item is in the cache, but stale.\n * - refresh: the item is in the cache, and not stale, but\n * {@link FetchOptions.forceRefresh} was specified.\n */\n fetch?: 'get' | 'inflight' | 'miss' | 'hit' | 'stale' | 'refresh'\n\n /**\n * The {@link OptionsBase.fetchMethod} was called\n */\n fetchDispatched?: true\n\n /**\n * The cached value was updated after a successful call to\n * {@link OptionsBase.fetchMethod}\n */\n fetchUpdated?: true\n\n /**\n * The reason for a fetch() rejection. Either the error raised by the\n * {@link OptionsBase.fetchMethod}, or the reason for an\n * AbortSignal.\n */\n fetchError?: Error\n\n /**\n * The fetch received an abort signal\n */\n fetchAborted?: true\n\n /**\n * The abort signal received was ignored, and the fetch was allowed to\n * continue.\n */\n fetchAbortIgnored?: true\n\n /**\n * The fetchMethod promise resolved successfully\n */\n fetchResolved?: true\n\n /**\n * The fetchMethod promise was rejected\n */\n fetchRejected?: true\n\n /**\n * The status of a {@link LRUCache#get} operation.\n *\n * - fetching: The item is currently being fetched. If a previous value\n * is present and allowed, that will be returned.\n * - stale: The item is in the cache, and is stale.\n * - hit: the item is in the cache\n * - miss: the item is not in the cache\n */\n get?: 'stale' | 'hit' | 'miss'\n\n /**\n * A fetch or get operation returned a stale value.\n */\n returnedStale?: true\n }\n\n /**\n * options which override the options set in the LRUCache constructor\n * when calling {@link LRUCache#fetch}.\n *\n * This is the union of {@link GetOptions} and {@link SetOptions}, plus\n * {@link OptionsBase.noDeleteOnFetchRejection},\n * {@link OptionsBase.allowStaleOnFetchRejection},\n * {@link FetchOptions.forceRefresh}, and\n * {@link FetcherOptions.context}\n *\n * Any of these may be modified in the {@link OptionsBase.fetchMethod}\n * function, but the {@link GetOptions} fields will of course have no\n * effect, as the {@link LRUCache#get} call already happened by the time\n * the fetchMethod is called.\n */\n export interface FetcherFetchOptions\n extends Pick<\n OptionsBase,\n | 'allowStale'\n | 'updateAgeOnGet'\n | 'noDeleteOnStaleGet'\n | 'sizeCalculation'\n | 'ttl'\n | 'noDisposeOnSet'\n | 'noUpdateTTL'\n | 'noDeleteOnFetchRejection'\n | 'allowStaleOnFetchRejection'\n | 'ignoreFetchAbort'\n | 'allowStaleOnFetchAbort'\n > {\n status?: Status\n size?: Size\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#fetch} method.\n */\n export interface FetchOptions\n extends FetcherFetchOptions {\n /**\n * Set to true to force a re-load of the existing data, even if it\n * is not yet stale.\n */\n forceRefresh?: boolean\n /**\n * Context provided to the {@link OptionsBase.fetchMethod} as\n * the {@link FetcherOptions.context} param.\n *\n * If the FC type is specified as unknown (the default),\n * undefined or void, then this is optional. Otherwise, it will\n * be required.\n */\n context?: FC\n signal?: AbortSignal\n status?: Status\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is something\n * other than `unknown`, `undefined`, or `void`\n */\n export interface FetchOptionsWithContext\n extends FetchOptions {\n context: FC\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is\n * `undefined` or `void`\n */\n export interface FetchOptionsNoContext\n extends FetchOptions {\n context?: undefined\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#has} method.\n */\n export interface HasOptions\n extends Pick, 'updateAgeOnHas'> {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#get} method.\n */\n export interface GetOptions\n extends Pick<\n OptionsBase,\n 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'\n > {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#peek} method.\n */\n export interface PeekOptions\n extends Pick, 'allowStale'> {}\n\n /**\n * Options that may be passed to the {@link LRUCache#set} method.\n */\n export interface SetOptions\n extends Pick<\n OptionsBase,\n 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL'\n > {\n /**\n * If size tracking is enabled, then setting an explicit size\n * in the {@link LRUCache#set} call will prevent calling the\n * {@link OptionsBase.sizeCalculation} function.\n */\n size?: Size\n /**\n * If TTL tracking is enabled, then setting an explicit start\n * time in the {@link LRUCache#set} call will override the\n * default time from `performance.now()` or `Date.now()`.\n *\n * Note that it must be a valid value for whichever time-tracking\n * method is in use.\n */\n start?: Milliseconds\n status?: Status\n }\n\n /**\n * The type signature for the {@link OptionsBase.fetchMethod} option.\n */\n export type Fetcher = (\n key: K,\n staleValue: V | undefined,\n options: FetcherOptions\n ) => Promise | V | undefined | void\n\n /**\n * Options which may be passed to the {@link LRUCache} constructor.\n *\n * Most of these may be overridden in the various options that use\n * them.\n *\n * Despite all being technically optional, the constructor requires that\n * a cache is at minimum limited by one or more of {@link OptionsBase.max},\n * {@link OptionsBase.ttl}, or {@link OptionsBase.maxSize}.\n *\n * If {@link OptionsBase.ttl} is used alone, then it is strongly advised\n * (and in fact required by the type definitions here) that the cache\n * also set {@link OptionsBase.ttlAutopurge}, to prevent potentially\n * unbounded storage.\n */\n export interface OptionsBase {\n /**\n * The maximum number of items to store in the cache before evicting\n * old entries. This is read-only on the {@link LRUCache} instance,\n * and may not be overridden.\n *\n * If set, then storage space will be pre-allocated at construction\n * time, and the cache will perform significantly faster.\n *\n * Note that significantly fewer items may be stored, if\n * {@link OptionsBase.maxSize} and/or {@link OptionsBase.ttl} are also\n * set.\n */\n max?: Count\n\n /**\n * Max time in milliseconds for items to live in cache before they are\n * considered stale. Note that stale items are NOT preemptively removed\n * by default, and MAY live in the cache long after they have expired.\n *\n * Also, as this cache is optimized for LRU/MRU operations, some of\n * the staleness/TTL checks will reduce performance, as they will incur\n * overhead by deleting items.\n *\n * Must be an integer number of ms. If set to 0, this indicates \"no TTL\"\n *\n * @default 0\n */\n ttl?: Milliseconds\n\n /**\n * Minimum amount of time in ms in which to check for staleness.\n * Defaults to 1, which means that the current time is checked\n * at most once per millisecond.\n *\n * Set to 0 to check the current time every time staleness is tested.\n * (This reduces performance, and is theoretically unnecessary.)\n *\n * Setting this to a higher value will improve performance somewhat\n * while using ttl tracking, albeit at the expense of keeping stale\n * items around a bit longer than their TTLs would indicate.\n *\n * @default 1\n */\n ttlResolution?: Milliseconds\n\n /**\n * Preemptively remove stale items from the cache.\n * Note that this may significantly degrade performance,\n * especially if the cache is storing a large number of items.\n * It is almost always best to just leave the stale items in\n * the cache, and let them fall out as new items are added.\n *\n * Note that this means that {@link OptionsBase.allowStale} is a bit\n * pointless, as stale items will be deleted almost as soon as they\n * expire.\n *\n * @default false\n */\n ttlAutopurge?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#get}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnGet?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#has}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnHas?: boolean\n\n /**\n * Allow {@link LRUCache#get} and {@link LRUCache#fetch} calls to return\n * stale data, if available.\n */\n allowStale?: boolean\n\n /**\n * Function that is called on items when they are dropped from the cache.\n * This can be handy if you want to close file descriptors or do other\n * cleanup tasks when items are no longer accessible. Called with `key,\n * value`. It's called before actually removing the item from the\n * internal cache, so it is *NOT* safe to re-add them.\n *\n * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after\n * they have been full removed, when it is safe to add them back to the\n * cache.\n */\n dispose?: Disposer\n\n /**\n * The same as {@link OptionsBase.dispose}, but called *after* the entry\n * is completely removed and the cache is once again in a clean state.\n * It is safe to add an item right back into the cache at this point.\n * However, note that it is *very* easy to inadvertently create infinite\n * recursion this way.\n */\n disposeAfter?: Disposer\n\n /**\n * Set to true to suppress calling the\n * {@link OptionsBase.dispose} function if the entry key is\n * still accessible within the cache.\n * This may be overridden by passing an options object to\n * {@link LRUCache#set}.\n */\n noDisposeOnSet?: boolean\n\n /**\n * Boolean flag to tell the cache to not update the TTL when\n * setting a new value for an existing key (ie, when updating a value\n * rather than inserting a new value). Note that the TTL value is\n * _always_ set (if provided) when adding a new entry into the cache.\n *\n * Has no effect if a {@link OptionsBase.ttl} is not set.\n */\n noUpdateTTL?: boolean\n\n /**\n * If you wish to track item size, you must provide a maxSize\n * note that we still will only keep up to max *actual items*,\n * if max is set, so size tracking may cause fewer than max items\n * to be stored. At the extreme, a single item of maxSize size\n * will cause everything else in the cache to be dropped when it\n * is added. Use with caution!\n *\n * Note also that size tracking can negatively impact performance,\n * though for most cases, only minimally.\n */\n maxSize?: Size\n\n /**\n * The maximum allowed size for any single item in the cache.\n *\n * If a larger item is passed to {@link LRUCache#set} or returned by a\n * {@link OptionsBase.fetchMethod}, then it will not be stored in the\n * cache.\n */\n maxEntrySize?: Size\n\n /**\n * A function that returns a number indicating the item's size.\n *\n * If not provided, and {@link OptionsBase.maxSize} or\n * {@link OptionsBase.maxEntrySize} are set, then all\n * {@link LRUCache#set} calls **must** provide an explicit\n * {@link SetOptions.size} or sizeCalculation param.\n */\n sizeCalculation?: SizeCalculator\n\n /**\n * Method that provides the implementation for {@link LRUCache#fetch}\n */\n fetchMethod?: Fetcher\n\n /**\n * Set to true to suppress the deletion of stale data when a\n * {@link OptionsBase.fetchMethod} returns a rejected promise.\n */\n noDeleteOnFetchRejection?: boolean\n\n /**\n * Do not delete stale items when they are retrieved with\n * {@link LRUCache#get}.\n *\n * Note that the `get` return value will still be `undefined`\n * unless {@link OptionsBase.allowStale} is true.\n */\n noDeleteOnStaleGet?: boolean\n\n /**\n * Set to true to allow returning stale data when a\n * {@link OptionsBase.fetchMethod} throws an error or returns a rejected\n * promise.\n *\n * This differs from using {@link OptionsBase.allowStale} in that stale\n * data will ONLY be returned in the case that the\n * {@link LRUCache#fetch} fails, not any other times.\n */\n allowStaleOnFetchRejection?: boolean\n\n /**\n * Set to true to return a stale value from the cache when the\n * `AbortSignal` passed to the {@link OptionsBase.fetchMethod} dispatches an `'abort'`\n * event, whether user-triggered, or due to internal cache behavior.\n *\n * Unless {@link OptionsBase.ignoreFetchAbort} is also set, the underlying\n * {@link OptionsBase.fetchMethod} will still be considered canceled, and\n * any value it returns will be ignored and not cached.\n *\n * Caveat: since fetches are aborted when a new value is explicitly\n * set in the cache, this can lead to fetch returning a stale value,\n * since that was the fallback value _at the moment the `fetch()` was\n * initiated_, even though the new updated value is now present in\n * the cache.\n *\n * For example:\n *\n * ```ts\n * const cache = new LRUCache({\n * ttl: 100,\n * fetchMethod: async (url, oldValue, { signal }) => {\n * const res = await fetch(url, { signal })\n * return await res.json()\n * }\n * })\n * cache.set('https://example.com/', { some: 'data' })\n * // 100ms go by...\n * const result = cache.fetch('https://example.com/')\n * cache.set('https://example.com/', { other: 'thing' })\n * console.log(await result) // { some: 'data' }\n * console.log(cache.get('https://example.com/')) // { other: 'thing' }\n * ```\n */\n allowStaleOnFetchAbort?: boolean\n\n /**\n * Set to true to ignore the `abort` event emitted by the `AbortSignal`\n * object passed to {@link OptionsBase.fetchMethod}, and still cache the\n * resulting resolution value, as long as it is not `undefined`.\n *\n * When used on its own, this means aborted {@link LRUCache#fetch} calls are not\n * immediately resolved or rejected when they are aborted, and instead\n * take the full time to await.\n *\n * When used with {@link OptionsBase.allowStaleOnFetchAbort}, aborted\n * {@link LRUCache#fetch} calls will resolve immediately to their stale\n * cached value or `undefined`, and will continue to process and eventually\n * update the cache when they resolve, as long as the resulting value is\n * not `undefined`, thus supporting a \"return stale on timeout while\n * refreshing\" mechanism by passing `AbortSignal.timeout(n)` as the signal.\n *\n * **Note**: regardless of this setting, an `abort` event _is still\n * emitted on the `AbortSignal` object_, so may result in invalid results\n * when passed to other underlying APIs that use AbortSignals.\n *\n * This may be overridden in the {@link OptionsBase.fetchMethod} or the\n * call to {@link LRUCache#fetch}.\n */\n ignoreFetchAbort?: boolean\n }\n\n export interface OptionsMaxLimit\n extends OptionsBase {\n max: Count\n }\n export interface OptionsTTLLimit\n extends OptionsBase {\n ttl: Milliseconds\n ttlAutopurge: boolean\n }\n export interface OptionsSizeLimit\n extends OptionsBase {\n maxSize: Size\n }\n\n /**\n * The valid safe options for the {@link LRUCache} constructor\n */\n export type Options =\n | OptionsMaxLimit\n | OptionsSizeLimit\n | OptionsTTLLimit\n\n /**\n * Entry objects used by {@link LRUCache#load} and {@link LRUCache#dump},\n * and returned by {@link LRUCache#info}.\n */\n export interface Entry {\n value: V\n ttl?: Milliseconds\n size?: Size\n start?: Milliseconds\n }\n}\n\n/**\n * Default export, the thing you're using this module to get.\n *\n * All properties from the options object (with the exception of\n * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as\n * normal public members. (`max` and `maxBase` are read-only getters.)\n * Changing any of these will alter the defaults for subsequent method calls,\n * but is otherwise safe.\n */\nexport class LRUCache implements Map {\n // properties coming in from the options of these, only max and maxSize\n // really *need* to be protected. The rest can be modified, as they just\n // set defaults for various methods.\n readonly #max: LRUCache.Count\n readonly #maxSize: LRUCache.Size\n readonly #dispose?: LRUCache.Disposer\n readonly #disposeAfter?: LRUCache.Disposer\n readonly #fetchMethod?: LRUCache.Fetcher\n\n /**\n * {@link LRUCache.OptionsBase.ttl}\n */\n ttl: LRUCache.Milliseconds\n\n /**\n * {@link LRUCache.OptionsBase.ttlResolution}\n */\n ttlResolution: LRUCache.Milliseconds\n /**\n * {@link LRUCache.OptionsBase.ttlAutopurge}\n */\n ttlAutopurge: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnGet}\n */\n updateAgeOnGet: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnHas}\n */\n updateAgeOnHas: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStale}\n */\n allowStale: boolean\n\n /**\n * {@link LRUCache.OptionsBase.noDisposeOnSet}\n */\n noDisposeOnSet: boolean\n /**\n * {@link LRUCache.OptionsBase.noUpdateTTL}\n */\n noUpdateTTL: boolean\n /**\n * {@link LRUCache.OptionsBase.maxEntrySize}\n */\n maxEntrySize: LRUCache.Size\n /**\n * {@link LRUCache.OptionsBase.sizeCalculation}\n */\n sizeCalculation?: LRUCache.SizeCalculator\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection}\n */\n noDeleteOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnStaleGet}\n */\n noDeleteOnStaleGet: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort}\n */\n allowStaleOnFetchAbort: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection}\n */\n allowStaleOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.ignoreFetchAbort}\n */\n ignoreFetchAbort: boolean\n\n // computed properties\n #size: LRUCache.Count\n #calculatedSize: LRUCache.Size\n #keyMap: Map\n #keyList: (K | undefined)[]\n #valList: (V | BackgroundFetch | undefined)[]\n #next: NumberArray\n #prev: NumberArray\n #head: Index\n #tail: Index\n #free: StackLike\n #disposed?: DisposeTask[]\n #sizes?: ZeroArray\n #starts?: ZeroArray\n #ttls?: ZeroArray\n\n #hasDispose: boolean\n #hasFetchMethod: boolean\n #hasDisposeAfter: boolean\n\n /**\n * Do not call this method unless you need to inspect the\n * inner workings of the cache. If anything returned by this\n * object is modified in any way, strange breakage may occur.\n *\n * These fields are private for a reason!\n *\n * @internal\n */\n static unsafeExposeInternals<\n K extends {},\n V extends {},\n FC extends unknown = unknown\n >(c: LRUCache) {\n return {\n // properties\n starts: c.#starts,\n ttls: c.#ttls,\n sizes: c.#sizes,\n keyMap: c.#keyMap as Map,\n keyList: c.#keyList,\n valList: c.#valList,\n next: c.#next,\n prev: c.#prev,\n get head() {\n return c.#head\n },\n get tail() {\n return c.#tail\n },\n free: c.#free,\n // methods\n isBackgroundFetch: (p: any) => c.#isBackgroundFetch(p),\n backgroundFetch: (\n k: K,\n index: number | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch =>\n c.#backgroundFetch(\n k,\n index as Index | undefined,\n options,\n context\n ),\n moveToTail: (index: number): void =>\n c.#moveToTail(index as Index),\n indexes: (options?: { allowStale: boolean }) =>\n c.#indexes(options),\n rindexes: (options?: { allowStale: boolean }) =>\n c.#rindexes(options),\n isStale: (index: number | undefined) =>\n c.#isStale(index as Index),\n }\n }\n\n // Protected read-only members\n\n /**\n * {@link LRUCache.OptionsBase.max} (read-only)\n */\n get max(): LRUCache.Count {\n return this.#max\n }\n /**\n * {@link LRUCache.OptionsBase.maxSize} (read-only)\n */\n get maxSize(): LRUCache.Count {\n return this.#maxSize\n }\n /**\n * The total computed size of items in the cache (read-only)\n */\n get calculatedSize(): LRUCache.Size {\n return this.#calculatedSize\n }\n /**\n * The number of items stored in the cache (read-only)\n */\n get size(): LRUCache.Count {\n return this.#size\n }\n /**\n * {@link LRUCache.OptionsBase.fetchMethod} (read-only)\n */\n get fetchMethod(): LRUCache.Fetcher | undefined {\n return this.#fetchMethod\n }\n /**\n * {@link LRUCache.OptionsBase.dispose} (read-only)\n */\n get dispose() {\n return this.#dispose\n }\n /**\n * {@link LRUCache.OptionsBase.disposeAfter} (read-only)\n */\n get disposeAfter() {\n return this.#disposeAfter\n }\n\n constructor(\n options: LRUCache.Options | LRUCache\n ) {\n const {\n max = 0,\n ttl,\n ttlResolution = 1,\n ttlAutopurge,\n updateAgeOnGet,\n updateAgeOnHas,\n allowStale,\n dispose,\n disposeAfter,\n noDisposeOnSet,\n noUpdateTTL,\n maxSize = 0,\n maxEntrySize = 0,\n sizeCalculation,\n fetchMethod,\n noDeleteOnFetchRejection,\n noDeleteOnStaleGet,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n } = options\n\n if (max !== 0 && !isPosInt(max)) {\n throw new TypeError('max option must be a nonnegative integer')\n }\n\n const UintArray = max ? getUintArray(max) : Array\n if (!UintArray) {\n throw new Error('invalid max value: ' + max)\n }\n\n this.#max = max\n this.#maxSize = maxSize\n this.maxEntrySize = maxEntrySize || this.#maxSize\n this.sizeCalculation = sizeCalculation\n if (this.sizeCalculation) {\n if (!this.#maxSize && !this.maxEntrySize) {\n throw new TypeError(\n 'cannot set sizeCalculation without setting maxSize or maxEntrySize'\n )\n }\n if (typeof this.sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation set to non-function')\n }\n }\n\n if (\n fetchMethod !== undefined &&\n typeof fetchMethod !== 'function'\n ) {\n throw new TypeError(\n 'fetchMethod must be a function if specified'\n )\n }\n this.#fetchMethod = fetchMethod\n this.#hasFetchMethod = !!fetchMethod\n\n this.#keyMap = new Map()\n this.#keyList = new Array(max).fill(undefined)\n this.#valList = new Array(max).fill(undefined)\n this.#next = new UintArray(max)\n this.#prev = new UintArray(max)\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free = Stack.create(max)\n this.#size = 0\n this.#calculatedSize = 0\n\n if (typeof dispose === 'function') {\n this.#dispose = dispose\n }\n if (typeof disposeAfter === 'function') {\n this.#disposeAfter = disposeAfter\n this.#disposed = []\n } else {\n this.#disposeAfter = undefined\n this.#disposed = undefined\n }\n this.#hasDispose = !!this.#dispose\n this.#hasDisposeAfter = !!this.#disposeAfter\n\n this.noDisposeOnSet = !!noDisposeOnSet\n this.noUpdateTTL = !!noUpdateTTL\n this.noDeleteOnFetchRejection = !!noDeleteOnFetchRejection\n this.allowStaleOnFetchRejection = !!allowStaleOnFetchRejection\n this.allowStaleOnFetchAbort = !!allowStaleOnFetchAbort\n this.ignoreFetchAbort = !!ignoreFetchAbort\n\n // NB: maxEntrySize is set to maxSize if it's set\n if (this.maxEntrySize !== 0) {\n if (this.#maxSize !== 0) {\n if (!isPosInt(this.#maxSize)) {\n throw new TypeError(\n 'maxSize must be a positive integer if specified'\n )\n }\n }\n if (!isPosInt(this.maxEntrySize)) {\n throw new TypeError(\n 'maxEntrySize must be a positive integer if specified'\n )\n }\n this.#initializeSizeTracking()\n }\n\n this.allowStale = !!allowStale\n this.noDeleteOnStaleGet = !!noDeleteOnStaleGet\n this.updateAgeOnGet = !!updateAgeOnGet\n this.updateAgeOnHas = !!updateAgeOnHas\n this.ttlResolution =\n isPosInt(ttlResolution) || ttlResolution === 0\n ? ttlResolution\n : 1\n this.ttlAutopurge = !!ttlAutopurge\n this.ttl = ttl || 0\n if (this.ttl) {\n if (!isPosInt(this.ttl)) {\n throw new TypeError(\n 'ttl must be a positive integer if specified'\n )\n }\n this.#initializeTTLTracking()\n }\n\n // do not allow completely unbounded caches\n if (this.#max === 0 && this.ttl === 0 && this.#maxSize === 0) {\n throw new TypeError(\n 'At least one of max, maxSize, or ttl is required'\n )\n }\n if (!this.ttlAutopurge && !this.#max && !this.#maxSize) {\n const code = 'LRU_CACHE_UNBOUNDED'\n if (shouldWarn(code)) {\n warned.add(code)\n const msg =\n 'TTL caching without ttlAutopurge, max, or maxSize can ' +\n 'result in unbounded memory consumption.'\n emitWarning(msg, 'UnboundedCacheWarning', code, LRUCache)\n }\n }\n }\n\n /**\n * Return the remaining TTL time for a given entry key\n */\n getRemainingTTL(key: K) {\n return this.#keyMap.has(key) ? Infinity : 0\n }\n\n #initializeTTLTracking() {\n const ttls = new ZeroArray(this.#max)\n const starts = new ZeroArray(this.#max)\n this.#ttls = ttls\n this.#starts = starts\n\n this.#setItemTTL = (index, ttl, start = perf.now()) => {\n starts[index] = ttl !== 0 ? start : 0\n ttls[index] = ttl\n if (ttl !== 0 && this.ttlAutopurge) {\n const t = setTimeout(() => {\n if (this.#isStale(index)) {\n this.delete(this.#keyList[index] as K)\n }\n }, ttl + 1)\n // unref() not supported on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n }\n\n this.#updateItemAge = index => {\n starts[index] = ttls[index] !== 0 ? perf.now() : 0\n }\n\n this.#statusTTL = (status, index) => {\n if (ttls[index]) {\n const ttl = ttls[index]\n const start = starts[index]\n /* c8 ignore next */\n if (!ttl || !start) return\n status.ttl = ttl\n status.start = start\n status.now = cachedNow || getNow()\n const age = status.now - start\n status.remainingTTL = ttl - age\n }\n }\n\n // debounce calls to perf.now() to 1s so we're not hitting\n // that costly call repeatedly.\n let cachedNow = 0\n const getNow = () => {\n const n = perf.now()\n if (this.ttlResolution > 0) {\n cachedNow = n\n const t = setTimeout(\n () => (cachedNow = 0),\n this.ttlResolution\n )\n // not available on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n return n\n }\n\n this.getRemainingTTL = key => {\n const index = this.#keyMap.get(key)\n if (index === undefined) {\n return 0\n }\n const ttl = ttls[index]\n const start = starts[index]\n if (!ttl || !start) {\n return Infinity\n }\n const age = (cachedNow || getNow()) - start\n return ttl - age\n }\n\n this.#isStale = index => {\n const s = starts[index]\n const t = ttls[index]\n return !!t && !!s && (cachedNow || getNow()) - s > t\n }\n }\n\n // conditionally set private methods related to TTL\n #updateItemAge: (index: Index) => void = () => {}\n #statusTTL: (status: LRUCache.Status, index: Index) => void =\n () => {}\n #setItemTTL: (\n index: Index,\n ttl: LRUCache.Milliseconds,\n start?: LRUCache.Milliseconds\n // ignore because we never call this if we're not already in TTL mode\n /* c8 ignore start */\n ) => void = () => {}\n /* c8 ignore stop */\n\n #isStale: (index: Index) => boolean = () => false\n\n #initializeSizeTracking() {\n const sizes = new ZeroArray(this.#max)\n this.#calculatedSize = 0\n this.#sizes = sizes\n this.#removeItemSize = index => {\n this.#calculatedSize -= sizes[index] as number\n sizes[index] = 0\n }\n this.#requireSize = (k, v, size, sizeCalculation) => {\n // provisionally accept background fetches.\n // actual value size will be checked when they return.\n if (this.#isBackgroundFetch(v)) {\n return 0\n }\n if (!isPosInt(size)) {\n if (sizeCalculation) {\n if (typeof sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation must be a function')\n }\n size = sizeCalculation(v, k)\n if (!isPosInt(size)) {\n throw new TypeError(\n 'sizeCalculation return invalid (expect positive integer)'\n )\n }\n } else {\n throw new TypeError(\n 'invalid size value (must be positive integer). ' +\n 'When maxSize or maxEntrySize is used, sizeCalculation ' +\n 'or size must be set.'\n )\n }\n }\n return size\n }\n this.#addItemSize = (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => {\n sizes[index] = size\n if (this.#maxSize) {\n const maxSize = this.#maxSize - (sizes[index] as number)\n while (this.#calculatedSize > maxSize) {\n this.#evict(true)\n }\n }\n this.#calculatedSize += sizes[index] as number\n if (status) {\n status.entrySize = size\n status.totalCalculatedSize = this.#calculatedSize\n }\n }\n }\n\n #removeItemSize: (index: Index) => void = _i => {}\n #addItemSize: (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => void = (_i, _s, _st) => {}\n #requireSize: (\n k: K,\n v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => LRUCache.Size = (\n _k: K,\n _v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => {\n if (size || sizeCalculation) {\n throw new TypeError(\n 'cannot set size without setting maxSize or maxEntrySize on cache'\n )\n }\n return 0\n };\n\n *#indexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#tail; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#head) {\n break\n } else {\n i = this.#prev[i] as Index\n }\n }\n }\n }\n\n *#rindexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#head; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#tail) {\n break\n } else {\n i = this.#next[i] as Index\n }\n }\n }\n }\n\n #isValidIndex(index: Index) {\n return (\n index !== undefined &&\n this.#keyMap.get(this.#keyList[index] as K) === index\n )\n }\n\n /**\n * Return a generator yielding `[key, value]` pairs,\n * in order from most recently used to least recently used.\n */\n *entries() {\n for (const i of this.#indexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]] as [K, V]\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.entries}\n *\n * Return a generator yielding `[key, value]` pairs,\n * in order from least recently used to most recently used.\n */\n *rentries() {\n for (const i of this.#rindexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]]\n }\n }\n }\n\n /**\n * Return a generator yielding the keys in the cache,\n * in order from most recently used to least recently used.\n */\n *keys() {\n for (const i of this.#indexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.keys}\n *\n * Return a generator yielding the keys in the cache,\n * in order from least recently used to most recently used.\n */\n *rkeys() {\n for (const i of this.#rindexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Return a generator yielding the values in the cache,\n * in order from most recently used to least recently used.\n */\n *values() {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i] as V\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.values}\n *\n * Return a generator yielding the values in the cache,\n * in order from least recently used to most recently used.\n */\n *rvalues() {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i]\n }\n }\n }\n\n /**\n * Iterating over the cache itself yields the same results as\n * {@link LRUCache.entries}\n */\n [Symbol.iterator]() {\n return this.entries()\n }\n\n /**\n * A String value that is used in the creation of the default string description of an object.\n * Called by the built-in method Object.prototype.toString.\n */\n [Symbol.toStringTag] = 'LRUCache'\n\n /**\n * Find a value for which the supplied fn method returns a truthy value,\n * similar to Array.find(). fn is called as fn(value, key, cache).\n */\n find(\n fn: (v: V, k: K, self: LRUCache) => boolean,\n getOptions: LRUCache.GetOptions = {}\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n if (fn(value, this.#keyList[i] as K, this)) {\n return this.get(this.#keyList[i] as K, getOptions)\n }\n }\n }\n\n /**\n * Call the supplied function on each item in the cache, in order from\n * most recently used to least recently used. fn is called as\n * fn(value, key, cache). Does not update age or recenty of use.\n * Does not iterate over stale values.\n */\n forEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * The same as {@link LRUCache.forEach} but items are iterated over in\n * reverse order. (ie, less recently used items are iterated over first.)\n */\n rforEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * Delete any stale entries. Returns true if anything was removed,\n * false otherwise.\n */\n purgeStale() {\n let deleted = false\n for (const i of this.#rindexes({ allowStale: true })) {\n if (this.#isStale(i)) {\n this.delete(this.#keyList[i] as K)\n deleted = true\n }\n }\n return deleted\n }\n\n /**\n * Get the extended info about a given entry, to get its value, size, and\n * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a\n * single key. Always returns stale values, if their info is found in the\n * cache, so be sure to check for expired TTLs if relevant.\n */\n info(key: K): LRUCache.Entry | undefined {\n const i = this.#keyMap.get(key)\n if (i === undefined) return undefined\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) return undefined\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n const ttl = this.#ttls[i]\n const start = this.#starts[i]\n if (ttl && start) {\n const remain = ttl - (perf.now() - start)\n entry.ttl = remain\n entry.start = Date.now()\n }\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n return entry\n }\n\n /**\n * Return an array of [key, {@link LRUCache.Entry}] tuples which can be\n * passed to cache.load()\n */\n dump() {\n const arr: [K, LRUCache.Entry][] = []\n for (const i of this.#indexes({ allowStale: true })) {\n const key = this.#keyList[i]\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined || key === undefined) continue\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n entry.ttl = this.#ttls[i]\n // always dump the start relative to a portable timestamp\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = perf.now() - (this.#starts[i] as number)\n entry.start = Math.floor(Date.now() - age)\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n arr.unshift([key, entry])\n }\n return arr\n }\n\n /**\n * Reset the cache and load in the items in entries in the order listed.\n * Note that the shape of the resulting cache may be different if the\n * same options are not used in both caches.\n */\n load(arr: [K, LRUCache.Entry][]) {\n this.clear()\n for (const [key, entry] of arr) {\n if (entry.start) {\n // entry.start is a portable timestamp, but we may be using\n // node's performance.now(), so calculate the offset, so that\n // we get the intended remaining TTL, no matter how long it's\n // been on ice.\n //\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = Date.now() - entry.start\n entry.start = perf.now() - age\n }\n this.set(key, entry.value, entry)\n }\n }\n\n /**\n * Add a value to the cache.\n *\n * Note: if `undefined` is specified as a value, this is an alias for\n * {@link LRUCache#delete}\n */\n set(\n k: K,\n v: V | BackgroundFetch | undefined,\n setOptions: LRUCache.SetOptions = {}\n ) {\n if (v === undefined) {\n this.delete(k)\n return this\n }\n const {\n ttl = this.ttl,\n start,\n noDisposeOnSet = this.noDisposeOnSet,\n sizeCalculation = this.sizeCalculation,\n status,\n } = setOptions\n let { noUpdateTTL = this.noUpdateTTL } = setOptions\n\n const size = this.#requireSize(\n k,\n v,\n setOptions.size || 0,\n sizeCalculation\n )\n // if the item doesn't fit, don't do anything\n // NB: maxEntrySize set to maxSize by default\n if (this.maxEntrySize && size > this.maxEntrySize) {\n if (status) {\n status.set = 'miss'\n status.maxEntrySizeExceeded = true\n }\n // have to delete, in case something is there already.\n this.delete(k)\n return this\n }\n let index = this.#size === 0 ? undefined : this.#keyMap.get(k)\n if (index === undefined) {\n // addition\n index = (\n this.#size === 0\n ? this.#tail\n : this.#free.length !== 0\n ? this.#free.pop()\n : this.#size === this.#max\n ? this.#evict(false)\n : this.#size\n ) as Index\n this.#keyList[index] = k\n this.#valList[index] = v\n this.#keyMap.set(k, index)\n this.#next[this.#tail] = index\n this.#prev[index] = this.#tail\n this.#tail = index\n this.#size++\n this.#addItemSize(index, size, status)\n if (status) status.set = 'add'\n noUpdateTTL = false\n } else {\n // update\n this.#moveToTail(index)\n const oldVal = this.#valList[index] as V | BackgroundFetch\n if (v !== oldVal) {\n if (this.#hasFetchMethod && this.#isBackgroundFetch(oldVal)) {\n oldVal.__abortController.abort(new Error('replaced'))\n const { __staleWhileFetching: s } = oldVal\n if (s !== undefined && !noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(s as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([s as V, k, 'set'])\n }\n }\n } else if (!noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(oldVal as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([oldVal as V, k, 'set'])\n }\n }\n this.#removeItemSize(index)\n this.#addItemSize(index, size, status)\n this.#valList[index] = v\n if (status) {\n status.set = 'replace'\n const oldValue =\n oldVal && this.#isBackgroundFetch(oldVal)\n ? oldVal.__staleWhileFetching\n : oldVal\n if (oldValue !== undefined) status.oldValue = oldValue\n }\n } else if (status) {\n status.set = 'update'\n }\n }\n if (ttl !== 0 && !this.#ttls) {\n this.#initializeTTLTracking()\n }\n if (this.#ttls) {\n if (!noUpdateTTL) {\n this.#setItemTTL(index, ttl, start)\n }\n if (status) this.#statusTTL(status, index)\n }\n if (!noDisposeOnSet && this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return this\n }\n\n /**\n * Evict the least recently used item, returning its value or\n * `undefined` if cache is empty.\n */\n pop(): V | undefined {\n try {\n while (this.#size) {\n const val = this.#valList[this.#head]\n this.#evict(true)\n if (this.#isBackgroundFetch(val)) {\n if (val.__staleWhileFetching) {\n return val.__staleWhileFetching\n }\n } else if (val !== undefined) {\n return val\n }\n }\n } finally {\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n }\n\n #evict(free: boolean) {\n const head = this.#head\n const k = this.#keyList[head] as K\n const v = this.#valList[head] as V\n if (this.#hasFetchMethod && this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('evicted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v, k, 'evict')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v, k, 'evict'])\n }\n }\n this.#removeItemSize(head)\n // if we aren't about to use the index, then null these out\n if (free) {\n this.#keyList[head] = undefined\n this.#valList[head] = undefined\n this.#free.push(head)\n }\n if (this.#size === 1) {\n this.#head = this.#tail = 0 as Index\n this.#free.length = 0\n } else {\n this.#head = this.#next[head] as Index\n }\n this.#keyMap.delete(k)\n this.#size--\n return head\n }\n\n /**\n * Check if a key is in the cache, without updating the recency of use.\n * Will return false if the item is stale, even though it is technically\n * in the cache.\n *\n * Will not update item age unless\n * {@link LRUCache.OptionsBase.updateAgeOnHas} is set.\n */\n has(k: K, hasOptions: LRUCache.HasOptions = {}) {\n const { updateAgeOnHas = this.updateAgeOnHas, status } =\n hasOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const v = this.#valList[index]\n if (\n this.#isBackgroundFetch(v) &&\n v.__staleWhileFetching === undefined\n ) {\n return false\n }\n if (!this.#isStale(index)) {\n if (updateAgeOnHas) {\n this.#updateItemAge(index)\n }\n if (status) {\n status.has = 'hit'\n this.#statusTTL(status, index)\n }\n return true\n } else if (status) {\n status.has = 'stale'\n this.#statusTTL(status, index)\n }\n } else if (status) {\n status.has = 'miss'\n }\n return false\n }\n\n /**\n * Like {@link LRUCache#get} but doesn't update recency or delete stale\n * items.\n *\n * Returns `undefined` if the item is stale, unless\n * {@link LRUCache.OptionsBase.allowStale} is set.\n */\n peek(k: K, peekOptions: LRUCache.PeekOptions = {}) {\n const { allowStale = this.allowStale } = peekOptions\n const index = this.#keyMap.get(k)\n if (\n index === undefined ||\n (!allowStale && this.#isStale(index))\n ) {\n return\n }\n const v = this.#valList[index]\n // either stale and allowed, or forcing a refresh of non-stale value\n return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v\n }\n\n #backgroundFetch(\n k: K,\n index: Index | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch {\n const v = index === undefined ? undefined : this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n return v\n }\n\n const ac = new AC()\n const { signal } = options\n // when/if our AC signals, then stop listening to theirs.\n signal?.addEventListener('abort', () => ac.abort(signal.reason), {\n signal: ac.signal,\n })\n\n const fetchOpts = {\n signal: ac.signal,\n options,\n context,\n }\n\n const cb = (\n v: V | undefined,\n updateCache = false\n ): V | undefined => {\n const { aborted } = ac.signal\n const ignoreAbort = options.ignoreFetchAbort && v !== undefined\n if (options.status) {\n if (aborted && !updateCache) {\n options.status.fetchAborted = true\n options.status.fetchError = ac.signal.reason\n if (ignoreAbort) options.status.fetchAbortIgnored = true\n } else {\n options.status.fetchResolved = true\n }\n }\n if (aborted && !ignoreAbort && !updateCache) {\n return fetchFail(ac.signal.reason)\n }\n // either we didn't abort, and are still here, or we did, and ignored\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n if (v === undefined) {\n if (bf.__staleWhileFetching) {\n this.#valList[index as Index] = bf.__staleWhileFetching\n } else {\n this.delete(k)\n }\n } else {\n if (options.status) options.status.fetchUpdated = true\n this.set(k, v, fetchOpts.options)\n }\n }\n return v\n }\n\n const eb = (er: any) => {\n if (options.status) {\n options.status.fetchRejected = true\n options.status.fetchError = er\n }\n return fetchFail(er)\n }\n\n const fetchFail = (er: any): V | undefined => {\n const { aborted } = ac.signal\n const allowStaleAborted =\n aborted && options.allowStaleOnFetchAbort\n const allowStale =\n allowStaleAborted || options.allowStaleOnFetchRejection\n const noDelete = allowStale || options.noDeleteOnFetchRejection\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n // if we allow stale on fetch rejections, then we need to ensure that\n // the stale value is not removed from the cache when the fetch fails.\n const del = !noDelete || bf.__staleWhileFetching === undefined\n if (del) {\n this.delete(k)\n } else if (!allowStaleAborted) {\n // still replace the *promise* with the stale value,\n // since we are done with the promise at this point.\n // leave it untouched if we're still waiting for an\n // aborted background fetch that hasn't yet returned.\n this.#valList[index as Index] = bf.__staleWhileFetching\n }\n }\n if (allowStale) {\n if (options.status && bf.__staleWhileFetching !== undefined) {\n options.status.returnedStale = true\n }\n return bf.__staleWhileFetching\n } else if (bf.__returned === bf) {\n throw er\n }\n }\n\n const pcall = (\n res: (v: V | undefined) => void,\n rej: (e: any) => void\n ) => {\n const fmp = this.#fetchMethod?.(k, v, fetchOpts)\n if (fmp && fmp instanceof Promise) {\n fmp.then(v => res(v === undefined ? undefined : v), rej)\n }\n // ignored, we go until we finish, regardless.\n // defer check until we are actually aborting,\n // so fetchMethod can override.\n ac.signal.addEventListener('abort', () => {\n if (\n !options.ignoreFetchAbort ||\n options.allowStaleOnFetchAbort\n ) {\n res(undefined)\n // when it eventually resolves, update the cache.\n if (options.allowStaleOnFetchAbort) {\n res = v => cb(v, true)\n }\n }\n })\n }\n\n if (options.status) options.status.fetchDispatched = true\n const p = new Promise(pcall).then(cb, eb)\n const bf: BackgroundFetch = Object.assign(p, {\n __abortController: ac,\n __staleWhileFetching: v,\n __returned: undefined,\n })\n\n if (index === undefined) {\n // internal, don't expose status.\n this.set(k, bf, { ...fetchOpts.options, status: undefined })\n index = this.#keyMap.get(k)\n } else {\n this.#valList[index] = bf\n }\n return bf\n }\n\n #isBackgroundFetch(p: any): p is BackgroundFetch {\n if (!this.#hasFetchMethod) return false\n const b = p as BackgroundFetch\n return (\n !!b &&\n b instanceof Promise &&\n b.hasOwnProperty('__staleWhileFetching') &&\n b.__abortController instanceof AC\n )\n }\n\n /**\n * Make an asynchronous cached fetch using the\n * {@link LRUCache.OptionsBase.fetchMethod} function.\n *\n * If multiple fetches for the same key are issued, then they will all be\n * coalesced into a single call to fetchMethod.\n *\n * Note that this means that handling options such as\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort},\n * {@link LRUCache.FetchOptions.signal},\n * and {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} will be\n * determined by the FIRST fetch() call for a given key.\n *\n * This is a known (fixable) shortcoming which will be addresed on when\n * someone complains about it, as the fix would involve added complexity and\n * may not be worth the costs for this edge case.\n */\n fetch(\n k: K,\n fetchOptions: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : LRUCache.FetchOptionsWithContext\n ): Promise\n // this overload not allowed if context is required\n fetch(\n k: unknown extends FC\n ? K\n : FC extends undefined | void\n ? K\n : never,\n fetchOptions?: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : never\n ): Promise\n async fetch(\n k: K,\n fetchOptions: LRUCache.FetchOptions = {}\n ): Promise {\n const {\n // get options\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n // set options\n ttl = this.ttl,\n noDisposeOnSet = this.noDisposeOnSet,\n size = 0,\n sizeCalculation = this.sizeCalculation,\n noUpdateTTL = this.noUpdateTTL,\n // fetch exclusive options\n noDeleteOnFetchRejection = this.noDeleteOnFetchRejection,\n allowStaleOnFetchRejection = this.allowStaleOnFetchRejection,\n ignoreFetchAbort = this.ignoreFetchAbort,\n allowStaleOnFetchAbort = this.allowStaleOnFetchAbort,\n context,\n forceRefresh = false,\n status,\n signal,\n } = fetchOptions\n\n if (!this.#hasFetchMethod) {\n if (status) status.fetch = 'get'\n return this.get(k, {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n status,\n })\n }\n\n const options = {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n ttl,\n noDisposeOnSet,\n size,\n sizeCalculation,\n noUpdateTTL,\n noDeleteOnFetchRejection,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n status,\n signal,\n }\n\n let index = this.#keyMap.get(k)\n if (index === undefined) {\n if (status) status.fetch = 'miss'\n const p = this.#backgroundFetch(k, index, options, context)\n return (p.__returned = p)\n } else {\n // in cache, maybe already fetching\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n const stale =\n allowStale && v.__staleWhileFetching !== undefined\n if (status) {\n status.fetch = 'inflight'\n if (stale) status.returnedStale = true\n }\n return stale ? v.__staleWhileFetching : (v.__returned = v)\n }\n\n // if we force a refresh, that means do NOT serve the cached value,\n // unless we are already in the process of refreshing the cache.\n const isStale = this.#isStale(index)\n if (!forceRefresh && !isStale) {\n if (status) status.fetch = 'hit'\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n if (status) this.#statusTTL(status, index)\n return v\n }\n\n // ok, it is stale or a forced refresh, and not already fetching.\n // refresh the cache.\n const p = this.#backgroundFetch(k, index, options, context)\n const hasStale = p.__staleWhileFetching !== undefined\n const staleVal = hasStale && allowStale\n if (status) {\n status.fetch = isStale ? 'stale' : 'refresh'\n if (staleVal && isStale) status.returnedStale = true\n }\n return staleVal ? p.__staleWhileFetching : (p.__returned = p)\n }\n }\n\n /**\n * Return a value from the cache. Will update the recency of the cache\n * entry found.\n *\n * If the key is not found, get() will return `undefined`.\n */\n get(k: K, getOptions: LRUCache.GetOptions = {}) {\n const {\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n status,\n } = getOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const value = this.#valList[index]\n const fetching = this.#isBackgroundFetch(value)\n if (status) this.#statusTTL(status, index)\n if (this.#isStale(index)) {\n if (status) status.get = 'stale'\n // delete only if not an in-flight background fetch\n if (!fetching) {\n if (!noDeleteOnStaleGet) {\n this.delete(k)\n }\n if (status && allowStale) status.returnedStale = true\n return allowStale ? value : undefined\n } else {\n if (\n status &&\n allowStale &&\n value.__staleWhileFetching !== undefined\n ) {\n status.returnedStale = true\n }\n return allowStale ? value.__staleWhileFetching : undefined\n }\n } else {\n if (status) status.get = 'hit'\n // if we're currently fetching it, we don't actually have it yet\n // it's not stale, which means this isn't a staleWhileRefetching.\n // If it's not stale, and fetching, AND has a __staleWhileFetching\n // value, then that means the user fetched with {forceRefresh:true},\n // so it's safe to return that value.\n if (fetching) {\n return value.__staleWhileFetching\n }\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n return value\n }\n } else if (status) {\n status.get = 'miss'\n }\n }\n\n #connect(p: Index, n: Index) {\n this.#prev[n] = p\n this.#next[p] = n\n }\n\n #moveToTail(index: Index): void {\n // if tail already, nothing to do\n // if head, move head to next[index]\n // else\n // move next[prev[index]] to next[index] (head has no prev)\n // move prev[next[index]] to prev[index]\n // prev[index] = tail\n // next[tail] = index\n // tail = index\n if (index !== this.#tail) {\n if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n this.#connect(\n this.#prev[index] as Index,\n this.#next[index] as Index\n )\n }\n this.#connect(this.#tail, index)\n this.#tail = index\n }\n }\n\n /**\n * Deletes a key out of the cache.\n * Returns true if the key was deleted, false otherwise.\n */\n delete(k: K) {\n let deleted = false\n if (this.#size !== 0) {\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n deleted = true\n if (this.#size === 1) {\n this.clear()\n } else {\n this.#removeItemSize(index)\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k, 'delete'])\n }\n }\n this.#keyMap.delete(k)\n this.#keyList[index] = undefined\n this.#valList[index] = undefined\n if (index === this.#tail) {\n this.#tail = this.#prev[index] as Index\n } else if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n const pi = this.#prev[index] as number\n this.#next[pi] = this.#next[index] as number\n const ni = this.#next[index] as number\n this.#prev[ni] = this.#prev[index] as number\n }\n this.#size--\n this.#free.push(index)\n }\n }\n }\n if (this.#hasDisposeAfter && this.#disposed?.length) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return deleted\n }\n\n /**\n * Clear the cache entirely, throwing away all values.\n */\n clear() {\n for (const index of this.#rindexes({ allowStale: true })) {\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else {\n const k = this.#keyList[index]\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k as K, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k as K, 'delete'])\n }\n }\n }\n\n this.#keyMap.clear()\n this.#valList.fill(undefined)\n this.#keyList.fill(undefined)\n if (this.#ttls && this.#starts) {\n this.#ttls.fill(0)\n this.#starts.fill(0)\n }\n if (this.#sizes) {\n this.#sizes.fill(0)\n }\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free.length = 0\n this.#calculatedSize = 0\n this.#size = 0\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n}\n\nexport default LRUCache\n"], + "mappings": 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b/dist/commonjs/package.json @@ -0,0 +1,3 @@ +{ + "type": "commonjs" +} diff --git a/dist/esm/index.d.ts b/dist/esm/index.d.ts new file mode 100644 index 0000000..769615c --- /dev/null +++ b/dist/esm/index.d.ts @@ -0,0 +1,857 @@ +/** + * @module LRUCache + */ +declare const TYPE: unique symbol; +export type PosInt = number & { + [TYPE]: 'Positive Integer'; +}; +export type Index = number & { + [TYPE]: 'LRUCache Index'; +}; +export type UintArray = Uint8Array | Uint16Array | Uint32Array; +export type NumberArray = UintArray | number[]; +declare class ZeroArray extends Array { + constructor(size: number); +} +export type { ZeroArray }; +export type { Stack }; +export type StackLike = Stack | Index[]; +declare class Stack { + #private; + heap: NumberArray; + length: number; + static create(max: number): StackLike; + constructor(max: number, HeapCls: { + new (n: number): NumberArray; + }); + push(n: Index): void; + pop(): Index; +} +/** + * Promise representing an in-progress {@link LRUCache#fetch} call + */ +export type BackgroundFetch = Promise & { + __returned: BackgroundFetch | undefined; + __abortController: AbortController; + __staleWhileFetching: V | undefined; +}; +export type DisposeTask = [ + value: V, + key: K, + reason: LRUCache.DisposeReason +]; +export declare namespace LRUCache { + /** + * An integer greater than 0, reflecting the calculated size of items + */ + type Size = number; + /** + * Integer greater than 0, representing some number of milliseconds, or the + * time at which a TTL started counting from. + */ + type Milliseconds = number; + /** + * An integer greater than 0, reflecting a number of items + */ + type Count = number; + /** + * The reason why an item was removed from the cache, passed + * to the {@link Disposer} methods. + */ + type DisposeReason = 'evict' | 'set' | 'delete'; + /** + * A method called upon item removal, passed as the + * {@link OptionsBase.dispose} and/or + * {@link OptionsBase.disposeAfter} options. + */ + type Disposer = (value: V, key: K, reason: DisposeReason) => void; + /** + * A function that returns the effective calculated size + * of an entry in the cache. + */ + type SizeCalculator = (value: V, key: K) => Size; + /** + * Options provided to the + * {@link OptionsBase.fetchMethod} function. + */ + interface FetcherOptions { + signal: AbortSignal; + options: FetcherFetchOptions; + /** + * Object provided in the {@link FetchOptions.context} option to + * {@link LRUCache#fetch} + */ + context: FC; + } + /** + * Status object that may be passed to {@link LRUCache#fetch}, + * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}. + */ + interface Status { + /** + * The status of a set() operation. + * + * - add: the item was not found in the cache, and was added + * - update: the item was in the cache, with the same value provided + * - replace: the item was in the cache, and replaced + * - miss: the item was not added to the cache for some reason + */ + set?: 'add' | 'update' | 'replace' | 'miss'; + /** + * the ttl stored for the item, or undefined if ttls are not used. + */ + ttl?: Milliseconds; + /** + * the start time for the item, or undefined if ttls are not used. + */ + start?: Milliseconds; + /** + * The timestamp used for TTL calculation + */ + now?: Milliseconds; + /** + * the remaining ttl for the item, or undefined if ttls are not used. + */ + remainingTTL?: Milliseconds; + /** + * The calculated size for the item, if sizes are used. + */ + entrySize?: Size; + /** + * The total calculated size of the cache, if sizes are used. + */ + totalCalculatedSize?: Size; + /** + * A flag indicating that the item was not stored, due to exceeding the + * {@link OptionsBase.maxEntrySize} + */ + maxEntrySizeExceeded?: true; + /** + * The old value, specified in the case of `set:'update'` or + * `set:'replace'` + */ + oldValue?: V; + /** + * The results of a {@link LRUCache#has} operation + * + * - hit: the item was found in the cache + * - stale: the item was found in the cache, but is stale + * - miss: the item was not found in the cache + */ + has?: 'hit' | 'stale' | 'miss'; + /** + * The status of a {@link LRUCache#fetch} operation. + * Note that this can change as the underlying fetch() moves through + * various states. + * + * - inflight: there is another fetch() for this key which is in process + * - get: there is no fetchMethod, so {@link LRUCache#get} was called. + * - miss: the item is not in cache, and will be fetched. + * - hit: the item is in the cache, and was resolved immediately. + * - stale: the item is in the cache, but stale. + * - refresh: the item is in the cache, and not stale, but + * {@link FetchOptions.forceRefresh} was specified. + */ + fetch?: 'get' | 'inflight' | 'miss' | 'hit' | 'stale' | 'refresh'; + /** + * The {@link OptionsBase.fetchMethod} was called + */ + fetchDispatched?: true; + /** + * The cached value was updated after a successful call to + * {@link OptionsBase.fetchMethod} + */ + fetchUpdated?: true; + /** + * The reason for a fetch() rejection. Either the error raised by the + * {@link OptionsBase.fetchMethod}, or the reason for an + * AbortSignal. + */ + fetchError?: Error; + /** + * The fetch received an abort signal + */ + fetchAborted?: true; + /** + * The abort signal received was ignored, and the fetch was allowed to + * continue. + */ + fetchAbortIgnored?: true; + /** + * The fetchMethod promise resolved successfully + */ + fetchResolved?: true; + /** + * The fetchMethod promise was rejected + */ + fetchRejected?: true; + /** + * The status of a {@link LRUCache#get} operation. + * + * - fetching: The item is currently being fetched. If a previous value + * is present and allowed, that will be returned. + * - stale: The item is in the cache, and is stale. + * - hit: the item is in the cache + * - miss: the item is not in the cache + */ + get?: 'stale' | 'hit' | 'miss'; + /** + * A fetch or get operation returned a stale value. + */ + returnedStale?: true; + } + /** + * options which override the options set in the LRUCache constructor + * when calling {@link LRUCache#fetch}. + * + * This is the union of {@link GetOptions} and {@link SetOptions}, plus + * {@link OptionsBase.noDeleteOnFetchRejection}, + * {@link OptionsBase.allowStaleOnFetchRejection}, + * {@link FetchOptions.forceRefresh}, and + * {@link FetcherOptions.context} + * + * Any of these may be modified in the {@link OptionsBase.fetchMethod} + * function, but the {@link GetOptions} fields will of course have no + * effect, as the {@link LRUCache#get} call already happened by the time + * the fetchMethod is called. + */ + interface FetcherFetchOptions extends Pick, 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet' | 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL' | 'noDeleteOnFetchRejection' | 'allowStaleOnFetchRejection' | 'ignoreFetchAbort' | 'allowStaleOnFetchAbort'> { + status?: Status; + size?: Size; + } + /** + * Options that may be passed to the {@link LRUCache#fetch} method. + */ + interface FetchOptions extends FetcherFetchOptions { + /** + * Set to true to force a re-load of the existing data, even if it + * is not yet stale. + */ + forceRefresh?: boolean; + /** + * Context provided to the {@link OptionsBase.fetchMethod} as + * the {@link FetcherOptions.context} param. + * + * If the FC type is specified as unknown (the default), + * undefined or void, then this is optional. Otherwise, it will + * be required. + */ + context?: FC; + signal?: AbortSignal; + status?: Status; + } + /** + * Options provided to {@link LRUCache#fetch} when the FC type is something + * other than `unknown`, `undefined`, or `void` + */ + interface FetchOptionsWithContext extends FetchOptions { + context: FC; + } + /** + * Options provided to {@link LRUCache#fetch} when the FC type is + * `undefined` or `void` + */ + interface FetchOptionsNoContext extends FetchOptions { + context?: undefined; + } + /** + * Options that may be passed to the {@link LRUCache#has} method. + */ + interface HasOptions extends Pick, 'updateAgeOnHas'> { + status?: Status; + } + /** + * Options that may be passed to the {@link LRUCache#get} method. + */ + interface GetOptions extends Pick, 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'> { + status?: Status; + } + /** + * Options that may be passed to the {@link LRUCache#peek} method. + */ + interface PeekOptions extends Pick, 'allowStale'> { + } + /** + * Options that may be passed to the {@link LRUCache#set} method. + */ + interface SetOptions extends Pick, 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL'> { + /** + * If size tracking is enabled, then setting an explicit size + * in the {@link LRUCache#set} call will prevent calling the + * {@link OptionsBase.sizeCalculation} function. + */ + size?: Size; + /** + * If TTL tracking is enabled, then setting an explicit start + * time in the {@link LRUCache#set} call will override the + * default time from `performance.now()` or `Date.now()`. + * + * Note that it must be a valid value for whichever time-tracking + * method is in use. + */ + start?: Milliseconds; + status?: Status; + } + /** + * The type signature for the {@link OptionsBase.fetchMethod} option. + */ + type Fetcher = (key: K, staleValue: V | undefined, options: FetcherOptions) => Promise | V | undefined | void; + /** + * Options which may be passed to the {@link LRUCache} constructor. + * + * Most of these may be overridden in the various options that use + * them. + * + * Despite all being technically optional, the constructor requires that + * a cache is at minimum limited by one or more of {@link OptionsBase.max}, + * {@link OptionsBase.ttl}, or {@link OptionsBase.maxSize}. + * + * If {@link OptionsBase.ttl} is used alone, then it is strongly advised + * (and in fact required by the type definitions here) that the cache + * also set {@link OptionsBase.ttlAutopurge}, to prevent potentially + * unbounded storage. + */ + interface OptionsBase { + /** + * The maximum number of items to store in the cache before evicting + * old entries. This is read-only on the {@link LRUCache} instance, + * and may not be overridden. + * + * If set, then storage space will be pre-allocated at construction + * time, and the cache will perform significantly faster. + * + * Note that significantly fewer items may be stored, if + * {@link OptionsBase.maxSize} and/or {@link OptionsBase.ttl} are also + * set. + */ + max?: Count; + /** + * Max time in milliseconds for items to live in cache before they are + * considered stale. Note that stale items are NOT preemptively removed + * by default, and MAY live in the cache long after they have expired. + * + * Also, as this cache is optimized for LRU/MRU operations, some of + * the staleness/TTL checks will reduce performance, as they will incur + * overhead by deleting items. + * + * Must be an integer number of ms. If set to 0, this indicates "no TTL" + * + * @default 0 + */ + ttl?: Milliseconds; + /** + * Minimum amount of time in ms in which to check for staleness. + * Defaults to 1, which means that the current time is checked + * at most once per millisecond. + * + * Set to 0 to check the current time every time staleness is tested. + * (This reduces performance, and is theoretically unnecessary.) + * + * Setting this to a higher value will improve performance somewhat + * while using ttl tracking, albeit at the expense of keeping stale + * items around a bit longer than their TTLs would indicate. + * + * @default 1 + */ + ttlResolution?: Milliseconds; + /** + * Preemptively remove stale items from the cache. + * Note that this may significantly degrade performance, + * especially if the cache is storing a large number of items. + * It is almost always best to just leave the stale items in + * the cache, and let them fall out as new items are added. + * + * Note that this means that {@link OptionsBase.allowStale} is a bit + * pointless, as stale items will be deleted almost as soon as they + * expire. + * + * @default false + */ + ttlAutopurge?: boolean; + /** + * Update the age of items on {@link LRUCache#get}, renewing their TTL + * + * Has no effect if {@link OptionsBase.ttl} is not set. + * + * @default false + */ + updateAgeOnGet?: boolean; + /** + * Update the age of items on {@link LRUCache#has}, renewing their TTL + * + * Has no effect if {@link OptionsBase.ttl} is not set. + * + * @default false + */ + updateAgeOnHas?: boolean; + /** + * Allow {@link LRUCache#get} and {@link LRUCache#fetch} calls to return + * stale data, if available. + */ + allowStale?: boolean; + /** + * Function that is called on items when they are dropped from the cache. + * This can be handy if you want to close file descriptors or do other + * cleanup tasks when items are no longer accessible. Called with `key, + * value`. It's called before actually removing the item from the + * internal cache, so it is *NOT* safe to re-add them. + * + * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after + * they have been full removed, when it is safe to add them back to the + * cache. + */ + dispose?: Disposer; + /** + * The same as {@link OptionsBase.dispose}, but called *after* the entry + * is completely removed and the cache is once again in a clean state. + * It is safe to add an item right back into the cache at this point. + * However, note that it is *very* easy to inadvertently create infinite + * recursion this way. + */ + disposeAfter?: Disposer; + /** + * Set to true to suppress calling the + * {@link OptionsBase.dispose} function if the entry key is + * still accessible within the cache. + * This may be overridden by passing an options object to + * {@link LRUCache#set}. + */ + noDisposeOnSet?: boolean; + /** + * Boolean flag to tell the cache to not update the TTL when + * setting a new value for an existing key (ie, when updating a value + * rather than inserting a new value). Note that the TTL value is + * _always_ set (if provided) when adding a new entry into the cache. + * + * Has no effect if a {@link OptionsBase.ttl} is not set. + */ + noUpdateTTL?: boolean; + /** + * If you wish to track item size, you must provide a maxSize + * note that we still will only keep up to max *actual items*, + * if max is set, so size tracking may cause fewer than max items + * to be stored. At the extreme, a single item of maxSize size + * will cause everything else in the cache to be dropped when it + * is added. Use with caution! + * + * Note also that size tracking can negatively impact performance, + * though for most cases, only minimally. + */ + maxSize?: Size; + /** + * The maximum allowed size for any single item in the cache. + * + * If a larger item is passed to {@link LRUCache#set} or returned by a + * {@link OptionsBase.fetchMethod}, then it will not be stored in the + * cache. + */ + maxEntrySize?: Size; + /** + * A function that returns a number indicating the item's size. + * + * If not provided, and {@link OptionsBase.maxSize} or + * {@link OptionsBase.maxEntrySize} are set, then all + * {@link LRUCache#set} calls **must** provide an explicit + * {@link SetOptions.size} or sizeCalculation param. + */ + sizeCalculation?: SizeCalculator; + /** + * Method that provides the implementation for {@link LRUCache#fetch} + */ + fetchMethod?: Fetcher; + /** + * Set to true to suppress the deletion of stale data when a + * {@link OptionsBase.fetchMethod} returns a rejected promise. + */ + noDeleteOnFetchRejection?: boolean; + /** + * Do not delete stale items when they are retrieved with + * {@link LRUCache#get}. + * + * Note that the `get` return value will still be `undefined` + * unless {@link OptionsBase.allowStale} is true. + */ + noDeleteOnStaleGet?: boolean; + /** + * Set to true to allow returning stale data when a + * {@link OptionsBase.fetchMethod} throws an error or returns a rejected + * promise. + * + * This differs from using {@link OptionsBase.allowStale} in that stale + * data will ONLY be returned in the case that the + * {@link LRUCache#fetch} fails, not any other times. + */ + allowStaleOnFetchRejection?: boolean; + /** + * Set to true to return a stale value from the cache when the + * `AbortSignal` passed to the {@link OptionsBase.fetchMethod} dispatches an `'abort'` + * event, whether user-triggered, or due to internal cache behavior. + * + * Unless {@link OptionsBase.ignoreFetchAbort} is also set, the underlying + * {@link OptionsBase.fetchMethod} will still be considered canceled, and + * any value it returns will be ignored and not cached. + * + * Caveat: since fetches are aborted when a new value is explicitly + * set in the cache, this can lead to fetch returning a stale value, + * since that was the fallback value _at the moment the `fetch()` was + * initiated_, even though the new updated value is now present in + * the cache. + * + * For example: + * + * ```ts + * const cache = new LRUCache({ + * ttl: 100, + * fetchMethod: async (url, oldValue, { signal }) => { + * const res = await fetch(url, { signal }) + * return await res.json() + * } + * }) + * cache.set('https://example.com/', { some: 'data' }) + * // 100ms go by... + * const result = cache.fetch('https://example.com/') + * cache.set('https://example.com/', { other: 'thing' }) + * console.log(await result) // { some: 'data' } + * console.log(cache.get('https://example.com/')) // { other: 'thing' } + * ``` + */ + allowStaleOnFetchAbort?: boolean; + /** + * Set to true to ignore the `abort` event emitted by the `AbortSignal` + * object passed to {@link OptionsBase.fetchMethod}, and still cache the + * resulting resolution value, as long as it is not `undefined`. + * + * When used on its own, this means aborted {@link LRUCache#fetch} calls are not + * immediately resolved or rejected when they are aborted, and instead + * take the full time to await. + * + * When used with {@link OptionsBase.allowStaleOnFetchAbort}, aborted + * {@link LRUCache#fetch} calls will resolve immediately to their stale + * cached value or `undefined`, and will continue to process and eventually + * update the cache when they resolve, as long as the resulting value is + * not `undefined`, thus supporting a "return stale on timeout while + * refreshing" mechanism by passing `AbortSignal.timeout(n)` as the signal. + * + * **Note**: regardless of this setting, an `abort` event _is still + * emitted on the `AbortSignal` object_, so may result in invalid results + * when passed to other underlying APIs that use AbortSignals. + * + * This may be overridden in the {@link OptionsBase.fetchMethod} or the + * call to {@link LRUCache#fetch}. + */ + ignoreFetchAbort?: boolean; + } + interface OptionsMaxLimit extends OptionsBase { + max: Count; + } + interface OptionsTTLLimit extends OptionsBase { + ttl: Milliseconds; + ttlAutopurge: boolean; + } + interface OptionsSizeLimit extends OptionsBase { + maxSize: Size; + } + /** + * The valid safe options for the {@link LRUCache} constructor + */ + type Options = OptionsMaxLimit | OptionsSizeLimit | OptionsTTLLimit; + /** + * Entry objects used by {@link LRUCache#load} and {@link LRUCache#dump}, + * and returned by {@link LRUCache#info}. + */ + interface Entry { + value: V; + ttl?: Milliseconds; + size?: Size; + start?: Milliseconds; + } +} +/** + * Default export, the thing you're using this module to get. + * + * All properties from the options object (with the exception of + * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as + * normal public members. (`max` and `maxBase` are read-only getters.) + * Changing any of these will alter the defaults for subsequent method calls, + * but is otherwise safe. + */ +export declare class LRUCache implements Map { + #private; + /** + * {@link LRUCache.OptionsBase.ttl} + */ + ttl: LRUCache.Milliseconds; + /** + * {@link LRUCache.OptionsBase.ttlResolution} + */ + ttlResolution: LRUCache.Milliseconds; + /** + * {@link LRUCache.OptionsBase.ttlAutopurge} + */ + ttlAutopurge: boolean; + /** + * {@link LRUCache.OptionsBase.updateAgeOnGet} + */ + updateAgeOnGet: boolean; + /** + * {@link LRUCache.OptionsBase.updateAgeOnHas} + */ + updateAgeOnHas: boolean; + /** + * {@link LRUCache.OptionsBase.allowStale} + */ + allowStale: boolean; + /** + * {@link LRUCache.OptionsBase.noDisposeOnSet} + */ + noDisposeOnSet: boolean; + /** + * {@link LRUCache.OptionsBase.noUpdateTTL} + */ + noUpdateTTL: boolean; + /** + * {@link LRUCache.OptionsBase.maxEntrySize} + */ + maxEntrySize: LRUCache.Size; + /** + * {@link LRUCache.OptionsBase.sizeCalculation} + */ + sizeCalculation?: LRUCache.SizeCalculator; + /** + * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection} + */ + noDeleteOnFetchRejection: boolean; + /** + * {@link LRUCache.OptionsBase.noDeleteOnStaleGet} + */ + noDeleteOnStaleGet: boolean; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort} + */ + allowStaleOnFetchAbort: boolean; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} + */ + allowStaleOnFetchRejection: boolean; + /** + * {@link LRUCache.OptionsBase.ignoreFetchAbort} + */ + ignoreFetchAbort: boolean; + /** + * Do not call this method unless you need to inspect the + * inner workings of the cache. If anything returned by this + * object is modified in any way, strange breakage may occur. + * + * These fields are private for a reason! + * + * @internal + */ + static unsafeExposeInternals(c: LRUCache): { + starts: ZeroArray | undefined; + ttls: ZeroArray | undefined; + sizes: ZeroArray | undefined; + keyMap: Map; + keyList: (K | undefined)[]; + valList: (V | BackgroundFetch | undefined)[]; + next: NumberArray; + prev: NumberArray; + readonly head: Index; + readonly tail: Index; + free: StackLike; + isBackgroundFetch: (p: any) => boolean; + backgroundFetch: (k: K, index: number | undefined, options: LRUCache.FetchOptions, context: any) => BackgroundFetch; + moveToTail: (index: number) => void; + indexes: (options?: { + allowStale: boolean; + }) => Generator; + rindexes: (options?: { + allowStale: boolean; + }) => Generator; + isStale: (index: number | undefined) => boolean; + }; + /** + * {@link LRUCache.OptionsBase.max} (read-only) + */ + get max(): LRUCache.Count; + /** + * {@link LRUCache.OptionsBase.maxSize} (read-only) + */ + get maxSize(): LRUCache.Count; + /** + * The total computed size of items in the cache (read-only) + */ + get calculatedSize(): LRUCache.Size; + /** + * The number of items stored in the cache (read-only) + */ + get size(): LRUCache.Count; + /** + * {@link LRUCache.OptionsBase.fetchMethod} (read-only) + */ + get fetchMethod(): LRUCache.Fetcher | undefined; + /** + * {@link LRUCache.OptionsBase.dispose} (read-only) + */ + get dispose(): LRUCache.Disposer | undefined; + /** + * {@link LRUCache.OptionsBase.disposeAfter} (read-only) + */ + get disposeAfter(): LRUCache.Disposer | undefined; + constructor(options: LRUCache.Options | LRUCache); + /** + * Return the remaining TTL time for a given entry key + */ + getRemainingTTL(key: K): number; + /** + * Return a generator yielding `[key, value]` pairs, + * in order from most recently used to least recently used. + */ + entries(): Generator<[K, V], void, unknown>; + /** + * Inverse order version of {@link LRUCache.entries} + * + * Return a generator yielding `[key, value]` pairs, + * in order from least recently used to most recently used. + */ + rentries(): Generator<(K | V | BackgroundFetch | undefined)[], void, unknown>; + /** + * Return a generator yielding the keys in the cache, + * in order from most recently used to least recently used. + */ + keys(): Generator; + /** + * Inverse order version of {@link LRUCache.keys} + * + * Return a generator yielding the keys in the cache, + * in order from least recently used to most recently used. + */ + rkeys(): Generator; + /** + * Return a generator yielding the values in the cache, + * in order from most recently used to least recently used. + */ + values(): Generator; + /** + * Inverse order version of {@link LRUCache.values} + * + * Return a generator yielding the values in the cache, + * in order from least recently used to most recently used. + */ + rvalues(): Generator | undefined, void, unknown>; + /** + * Iterating over the cache itself yields the same results as + * {@link LRUCache.entries} + */ + [Symbol.iterator](): Generator<[K, V], void, unknown>; + /** + * A String value that is used in the creation of the default string description of an object. + * Called by the built-in method Object.prototype.toString. + */ + [Symbol.toStringTag]: string; + /** + * Find a value for which the supplied fn method returns a truthy value, + * similar to Array.find(). fn is called as fn(value, key, cache). + */ + find(fn: (v: V, k: K, self: LRUCache) => boolean, getOptions?: LRUCache.GetOptions): V | undefined; + /** + * Call the supplied function on each item in the cache, in order from + * most recently used to least recently used. fn is called as + * fn(value, key, cache). Does not update age or recenty of use. + * Does not iterate over stale values. + */ + forEach(fn: (v: V, k: K, self: LRUCache) => any, thisp?: any): void; + /** + * The same as {@link LRUCache.forEach} but items are iterated over in + * reverse order. (ie, less recently used items are iterated over first.) + */ + rforEach(fn: (v: V, k: K, self: LRUCache) => any, thisp?: any): void; + /** + * Delete any stale entries. Returns true if anything was removed, + * false otherwise. + */ + purgeStale(): boolean; + /** + * Get the extended info about a given entry, to get its value, size, and + * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a + * single key. Always returns stale values, if their info is found in the + * cache, so be sure to check for expired TTLs if relevant. + */ + info(key: K): LRUCache.Entry | undefined; + /** + * Return an array of [key, {@link LRUCache.Entry}] tuples which can be + * passed to cache.load() + */ + dump(): [K, LRUCache.Entry][]; + /** + * Reset the cache and load in the items in entries in the order listed. + * Note that the shape of the resulting cache may be different if the + * same options are not used in both caches. + */ + load(arr: [K, LRUCache.Entry][]): void; + /** + * Add a value to the cache. + * + * Note: if `undefined` is specified as a value, this is an alias for + * {@link LRUCache#delete} + */ + set(k: K, v: V | BackgroundFetch | undefined, setOptions?: LRUCache.SetOptions): this; + /** + * Evict the least recently used item, returning its value or + * `undefined` if cache is empty. + */ + pop(): V | undefined; + /** + * Check if a key is in the cache, without updating the recency of use. + * Will return false if the item is stale, even though it is technically + * in the cache. + * + * Will not update item age unless + * {@link LRUCache.OptionsBase.updateAgeOnHas} is set. + */ + has(k: K, hasOptions?: LRUCache.HasOptions): boolean; + /** + * Like {@link LRUCache#get} but doesn't update recency or delete stale + * items. + * + * Returns `undefined` if the item is stale, unless + * {@link LRUCache.OptionsBase.allowStale} is set. + */ + peek(k: K, peekOptions?: LRUCache.PeekOptions): V | undefined; + /** + * Make an asynchronous cached fetch using the + * {@link LRUCache.OptionsBase.fetchMethod} function. + * + * If multiple fetches for the same key are issued, then they will all be + * coalesced into a single call to fetchMethod. + * + * Note that this means that handling options such as + * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort}, + * {@link LRUCache.FetchOptions.signal}, + * and {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} will be + * determined by the FIRST fetch() call for a given key. + * + * This is a known (fixable) shortcoming which will be addresed on when + * someone complains about it, as the fix would involve added complexity and + * may not be worth the costs for this edge case. + */ + fetch(k: K, fetchOptions: unknown extends FC ? LRUCache.FetchOptions : FC extends undefined | void ? LRUCache.FetchOptionsNoContext : LRUCache.FetchOptionsWithContext): Promise; + fetch(k: unknown extends FC ? K : FC extends undefined | void ? K : never, fetchOptions?: unknown extends FC ? LRUCache.FetchOptions : FC extends undefined | void ? LRUCache.FetchOptionsNoContext : never): Promise; + /** + * Return a value from the cache. Will update the recency of the cache + * entry found. + * + * If the key is not found, get() will return `undefined`. + */ + get(k: K, getOptions?: LRUCache.GetOptions): V | undefined; + /** + * Deletes a key out of the cache. + * Returns true if the key was deleted, false otherwise. + */ + delete(k: K): boolean; + /** + * Clear the cache entirely, throwing away all values. + */ + clear(): void; +} +export default LRUCache; +//# sourceMappingURL=index.d.ts.map \ No newline at end of file diff --git a/dist/esm/index.d.ts.map b/dist/esm/index.d.ts.map new file mode 100644 index 0000000..1aa47a0 --- /dev/null +++ b/dist/esm/index.d.ts.map @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/dist/esm/index.js b/dist/esm/index.js new file mode 100644 index 0000000..12deaee --- /dev/null +++ b/dist/esm/index.js @@ -0,0 +1,1443 @@ +/** + * @module LRUCache + */ +const perf = typeof performance === 'object' && + performance && + typeof performance.now === 'function' + ? performance + : Date; +const warned = new Set(); +/* c8 ignore start */ +const PROCESS = (typeof process === 'object' && !!process ? process : {}); +/* c8 ignore start */ +const emitWarning = (msg, type, code, fn) => { + typeof PROCESS.emitWarning === 'function' + ? PROCESS.emitWarning(msg, type, code, fn) + : console.error(`[${code}] ${type}: ${msg}`); +}; +let AC = globalThis.AbortController; +let AS = globalThis.AbortSignal; +/* c8 ignore start */ +if (typeof AC === 'undefined') { + //@ts-ignore + AS = class AbortSignal { + onabort; + _onabort = []; + reason; + aborted = false; + addEventListener(_, fn) { + this._onabort.push(fn); + } + }; + //@ts-ignore + AC = class AbortController { + constructor() { + warnACPolyfill(); + } + signal = new AS(); + abort(reason) { + if (this.signal.aborted) + return; + //@ts-ignore + this.signal.reason = reason; + //@ts-ignore + this.signal.aborted = true; + //@ts-ignore + for (const fn of this.signal._onabort) { + fn(reason); + } + this.signal.onabort?.(reason); + } + }; + let printACPolyfillWarning = PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'; + const warnACPolyfill = () => { + if (!printACPolyfillWarning) + return; + printACPolyfillWarning = false; + emitWarning('AbortController is not defined. If using lru-cache in ' + + 'node 14, load an AbortController polyfill from the ' + + '`node-abort-controller` package. A minimal polyfill is ' + + 'provided for use by LRUCache.fetch(), but it should not be ' + + 'relied upon in other contexts (eg, passing it to other APIs that ' + + 'use AbortController/AbortSignal might have undesirable effects). ' + + 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.', 'NO_ABORT_CONTROLLER', 'ENOTSUP', warnACPolyfill); + }; +} +/* c8 ignore stop */ +const shouldWarn = (code) => !warned.has(code); +const TYPE = Symbol('type'); +const isPosInt = (n) => n && n === Math.floor(n) && n > 0 && isFinite(n); +/* c8 ignore start */ +// This is a little bit ridiculous, tbh. +// The maximum array length is 2^32-1 or thereabouts on most JS impls. +// And well before that point, you're caching the entire world, I mean, +// that's ~32GB of just integers for the next/prev links, plus whatever +// else to hold that many keys and values. Just filling the memory with +// zeroes at init time is brutal when you get that big. +// But why not be complete? +// Maybe in the future, these limits will have expanded. +const getUintArray = (max) => !isPosInt(max) + ? null + : max <= Math.pow(2, 8) + ? Uint8Array + : max <= Math.pow(2, 16) + ? Uint16Array + : max <= Math.pow(2, 32) + ? Uint32Array + : max <= Number.MAX_SAFE_INTEGER + ? ZeroArray + : null; +/* c8 ignore stop */ +class ZeroArray extends Array { + constructor(size) { + super(size); + this.fill(0); + } +} +class Stack { + heap; + length; + // private constructor + static #constructing = false; + static create(max) { + const HeapCls = getUintArray(max); + if (!HeapCls) + return []; + Stack.#constructing = true; + const s = new Stack(max, HeapCls); + Stack.#constructing = false; + return s; + } + constructor(max, HeapCls) { + /* c8 ignore start */ + if (!Stack.#constructing) { + throw new TypeError('instantiate Stack using Stack.create(n)'); + } + /* c8 ignore stop */ + this.heap = new HeapCls(max); + this.length = 0; + } + push(n) { + this.heap[this.length++] = n; + } + pop() { + return this.heap[--this.length]; + } +} +/** + * Default export, the thing you're using this module to get. + * + * All properties from the options object (with the exception of + * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as + * normal public members. (`max` and `maxBase` are read-only getters.) + * Changing any of these will alter the defaults for subsequent method calls, + * but is otherwise safe. + */ +export class LRUCache { + // properties coming in from the options of these, only max and maxSize + // really *need* to be protected. The rest can be modified, as they just + // set defaults for various methods. + #max; + #maxSize; + #dispose; + #disposeAfter; + #fetchMethod; + /** + * {@link LRUCache.OptionsBase.ttl} + */ + ttl; + /** + * {@link LRUCache.OptionsBase.ttlResolution} + */ + ttlResolution; + /** + * {@link LRUCache.OptionsBase.ttlAutopurge} + */ + ttlAutopurge; + /** + * {@link LRUCache.OptionsBase.updateAgeOnGet} + */ + updateAgeOnGet; + /** + * {@link LRUCache.OptionsBase.updateAgeOnHas} + */ + updateAgeOnHas; + /** + * {@link LRUCache.OptionsBase.allowStale} + */ + allowStale; + /** + * {@link LRUCache.OptionsBase.noDisposeOnSet} + */ + noDisposeOnSet; + /** + * {@link LRUCache.OptionsBase.noUpdateTTL} + */ + noUpdateTTL; + /** + * {@link LRUCache.OptionsBase.maxEntrySize} + */ + maxEntrySize; + /** + * {@link LRUCache.OptionsBase.sizeCalculation} + */ + sizeCalculation; + /** + * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection} + */ + noDeleteOnFetchRejection; + /** + * {@link LRUCache.OptionsBase.noDeleteOnStaleGet} + */ + noDeleteOnStaleGet; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort} + */ + allowStaleOnFetchAbort; + /** + * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} + */ + allowStaleOnFetchRejection; + /** + * {@link LRUCache.OptionsBase.ignoreFetchAbort} + */ + ignoreFetchAbort; + // computed properties + #size; + #calculatedSize; + #keyMap; + #keyList; + #valList; + #next; + #prev; + #head; + #tail; + #free; + #disposed; + #sizes; + #starts; + #ttls; + #hasDispose; + #hasFetchMethod; + #hasDisposeAfter; + /** + * Do not call this method unless you need to inspect the + * inner workings of the cache. If anything returned by this + * object is modified in any way, strange breakage may occur. + * + * These fields are private for a reason! + * + * @internal + */ + static unsafeExposeInternals(c) { + return { + // properties + starts: c.#starts, + ttls: c.#ttls, + sizes: c.#sizes, + keyMap: c.#keyMap, + keyList: c.#keyList, + valList: c.#valList, + next: c.#next, + prev: c.#prev, + get head() { + return c.#head; + }, + get tail() { + return c.#tail; + }, + free: c.#free, + // methods + isBackgroundFetch: (p) => c.#isBackgroundFetch(p), + backgroundFetch: (k, index, options, context) => c.#backgroundFetch(k, index, options, context), + moveToTail: (index) => c.#moveToTail(index), + indexes: (options) => c.#indexes(options), + rindexes: (options) => c.#rindexes(options), + isStale: (index) => c.#isStale(index), + }; + } + // Protected read-only members + /** + * {@link LRUCache.OptionsBase.max} (read-only) + */ + get max() { + return this.#max; + } + /** + * {@link LRUCache.OptionsBase.maxSize} (read-only) + */ + get maxSize() { + return this.#maxSize; + } + /** + * The total computed size of items in the cache (read-only) + */ + get calculatedSize() { + return this.#calculatedSize; + } + /** + * The number of items stored in the cache (read-only) + */ + get size() { + return this.#size; + } + /** + * {@link LRUCache.OptionsBase.fetchMethod} (read-only) + */ + get fetchMethod() { + return this.#fetchMethod; + } + /** + * {@link LRUCache.OptionsBase.dispose} (read-only) + */ + get dispose() { + return this.#dispose; + } + /** + * {@link LRUCache.OptionsBase.disposeAfter} (read-only) + */ + get disposeAfter() { + return this.#disposeAfter; + } + constructor(options) { + const { max = 0, ttl, ttlResolution = 1, ttlAutopurge, updateAgeOnGet, updateAgeOnHas, allowStale, dispose, disposeAfter, noDisposeOnSet, noUpdateTTL, maxSize = 0, maxEntrySize = 0, sizeCalculation, fetchMethod, noDeleteOnFetchRejection, noDeleteOnStaleGet, allowStaleOnFetchRejection, allowStaleOnFetchAbort, ignoreFetchAbort, } = options; + if (max !== 0 && !isPosInt(max)) { + throw new TypeError('max option must be a nonnegative integer'); + } + const UintArray = max ? getUintArray(max) : Array; + if (!UintArray) { + throw new Error('invalid max value: ' + max); + } + this.#max = max; + this.#maxSize = maxSize; + this.maxEntrySize = maxEntrySize || this.#maxSize; + this.sizeCalculation = sizeCalculation; + if (this.sizeCalculation) { + if (!this.#maxSize && !this.maxEntrySize) { + throw new TypeError('cannot set sizeCalculation without setting maxSize or maxEntrySize'); + } + if (typeof this.sizeCalculation !== 'function') { + throw new TypeError('sizeCalculation set to non-function'); + } + } + if (fetchMethod !== undefined && + typeof fetchMethod !== 'function') { + throw new TypeError('fetchMethod must be a function if specified'); + } + this.#fetchMethod = fetchMethod; + this.#hasFetchMethod = !!fetchMethod; + this.#keyMap = new Map(); + this.#keyList = new Array(max).fill(undefined); + this.#valList = new Array(max).fill(undefined); + this.#next = new UintArray(max); + this.#prev = new UintArray(max); + this.#head = 0; + this.#tail = 0; + this.#free = Stack.create(max); + this.#size = 0; + this.#calculatedSize = 0; + if (typeof dispose === 'function') { + this.#dispose = dispose; + } + if (typeof disposeAfter === 'function') { + this.#disposeAfter = disposeAfter; + this.#disposed = []; + } + else { + this.#disposeAfter = undefined; + this.#disposed = undefined; + } + this.#hasDispose = !!this.#dispose; + this.#hasDisposeAfter = !!this.#disposeAfter; + this.noDisposeOnSet = !!noDisposeOnSet; + this.noUpdateTTL = !!noUpdateTTL; + this.noDeleteOnFetchRejection = !!noDeleteOnFetchRejection; + this.allowStaleOnFetchRejection = !!allowStaleOnFetchRejection; + this.allowStaleOnFetchAbort = !!allowStaleOnFetchAbort; + this.ignoreFetchAbort = !!ignoreFetchAbort; + // NB: maxEntrySize is set to maxSize if it's set + if (this.maxEntrySize !== 0) { + if (this.#maxSize !== 0) { + if (!isPosInt(this.#maxSize)) { + throw new TypeError('maxSize must be a positive integer if specified'); + } + } + if (!isPosInt(this.maxEntrySize)) { + throw new TypeError('maxEntrySize must be a positive integer if specified'); + } + this.#initializeSizeTracking(); + } + this.allowStale = !!allowStale; + this.noDeleteOnStaleGet = !!noDeleteOnStaleGet; + this.updateAgeOnGet = !!updateAgeOnGet; + this.updateAgeOnHas = !!updateAgeOnHas; + this.ttlResolution = + isPosInt(ttlResolution) || ttlResolution === 0 + ? ttlResolution + : 1; + this.ttlAutopurge = !!ttlAutopurge; + this.ttl = ttl || 0; + if (this.ttl) { + if (!isPosInt(this.ttl)) { + throw new TypeError('ttl must be a positive integer if specified'); + } + this.#initializeTTLTracking(); + } + // do not allow completely unbounded caches + if (this.#max === 0 && this.ttl === 0 && this.#maxSize === 0) { + throw new TypeError('At least one of max, maxSize, or ttl is required'); + } + if (!this.ttlAutopurge && !this.#max && !this.#maxSize) { + const code = 'LRU_CACHE_UNBOUNDED'; + if (shouldWarn(code)) { + warned.add(code); + const msg = 'TTL caching without ttlAutopurge, max, or maxSize can ' + + 'result in unbounded memory consumption.'; + emitWarning(msg, 'UnboundedCacheWarning', code, LRUCache); + } + } + } + /** + * Return the remaining TTL time for a given entry key + */ + getRemainingTTL(key) { + return this.#keyMap.has(key) ? Infinity : 0; + } + #initializeTTLTracking() { + const ttls = new ZeroArray(this.#max); + const starts = new ZeroArray(this.#max); + this.#ttls = ttls; + this.#starts = starts; + this.#setItemTTL = (index, ttl, start = perf.now()) => { + starts[index] = ttl !== 0 ? start : 0; + ttls[index] = ttl; + if (ttl !== 0 && this.ttlAutopurge) { + const t = setTimeout(() => { + if (this.#isStale(index)) { + this.delete(this.#keyList[index]); + } + }, ttl + 1); + // unref() not supported on all platforms + /* c8 ignore start */ + if (t.unref) { + t.unref(); + } + /* c8 ignore stop */ + } + }; + this.#updateItemAge = index => { + starts[index] = ttls[index] !== 0 ? perf.now() : 0; + }; + this.#statusTTL = (status, index) => { + if (ttls[index]) { + const ttl = ttls[index]; + const start = starts[index]; + /* c8 ignore next */ + if (!ttl || !start) + return; + status.ttl = ttl; + status.start = start; + status.now = cachedNow || getNow(); + const age = status.now - start; + status.remainingTTL = ttl - age; + } + }; + // debounce calls to perf.now() to 1s so we're not hitting + // that costly call repeatedly. + let cachedNow = 0; + const getNow = () => { + const n = perf.now(); + if (this.ttlResolution > 0) { + cachedNow = n; + const t = setTimeout(() => (cachedNow = 0), this.ttlResolution); + // not available on all platforms + /* c8 ignore start */ + if (t.unref) { + t.unref(); + } + /* c8 ignore stop */ + } + return n; + }; + this.getRemainingTTL = key => { + const index = this.#keyMap.get(key); + if (index === undefined) { + return 0; + } + const ttl = ttls[index]; + const start = starts[index]; + if (!ttl || !start) { + return Infinity; + } + const age = (cachedNow || getNow()) - start; + return ttl - age; + }; + this.#isStale = index => { + const s = starts[index]; + const t = ttls[index]; + return !!t && !!s && (cachedNow || getNow()) - s > t; + }; + } + // conditionally set private methods related to TTL + #updateItemAge = () => { }; + #statusTTL = () => { }; + #setItemTTL = () => { }; + /* c8 ignore stop */ + #isStale = () => false; + #initializeSizeTracking() { + const sizes = new ZeroArray(this.#max); + this.#calculatedSize = 0; + this.#sizes = sizes; + this.#removeItemSize = index => { + this.#calculatedSize -= sizes[index]; + sizes[index] = 0; + }; + this.#requireSize = (k, v, size, sizeCalculation) => { + // provisionally accept background fetches. + // actual value size will be checked when they return. + if (this.#isBackgroundFetch(v)) { + return 0; + } + if (!isPosInt(size)) { + if (sizeCalculation) { + if (typeof sizeCalculation !== 'function') { + throw new TypeError('sizeCalculation must be a function'); + } + size = sizeCalculation(v, k); + if (!isPosInt(size)) { + throw new TypeError('sizeCalculation return invalid (expect positive integer)'); + } + } + else { + throw new TypeError('invalid size value (must be positive integer). ' + + 'When maxSize or maxEntrySize is used, sizeCalculation ' + + 'or size must be set.'); + } + } + return size; + }; + this.#addItemSize = (index, size, status) => { + sizes[index] = size; + if (this.#maxSize) { + const maxSize = this.#maxSize - sizes[index]; + while (this.#calculatedSize > maxSize) { + this.#evict(true); + } + } + this.#calculatedSize += sizes[index]; + if (status) { + status.entrySize = size; + status.totalCalculatedSize = this.#calculatedSize; + } + }; + } + #removeItemSize = _i => { }; + #addItemSize = (_i, _s, _st) => { }; + #requireSize = (_k, _v, size, sizeCalculation) => { + if (size || sizeCalculation) { + throw new TypeError('cannot set size without setting maxSize or maxEntrySize on cache'); + } + return 0; + }; + *#indexes({ allowStale = this.allowStale } = {}) { + if (this.#size) { + for (let i = this.#tail; true;) { + if (!this.#isValidIndex(i)) { + break; + } + if (allowStale || !this.#isStale(i)) { + yield i; + } + if (i === this.#head) { + break; + } + else { + i = this.#prev[i]; + } + } + } + } + *#rindexes({ allowStale = this.allowStale } = {}) { + if (this.#size) { + for (let i = this.#head; true;) { + if (!this.#isValidIndex(i)) { + break; + } + if (allowStale || !this.#isStale(i)) { + yield i; + } + if (i === this.#tail) { + break; + } + else { + i = this.#next[i]; + } + } + } + } + #isValidIndex(index) { + return (index !== undefined && + this.#keyMap.get(this.#keyList[index]) === index); + } + /** + * Return a generator yielding `[key, value]` pairs, + * in order from most recently used to least recently used. + */ + *entries() { + for (const i of this.#indexes()) { + if (this.#valList[i] !== undefined && + this.#keyList[i] !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield [this.#keyList[i], this.#valList[i]]; + } + } + } + /** + * Inverse order version of {@link LRUCache.entries} + * + * Return a generator yielding `[key, value]` pairs, + * in order from least recently used to most recently used. + */ + *rentries() { + for (const i of this.#rindexes()) { + if (this.#valList[i] !== undefined && + this.#keyList[i] !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield [this.#keyList[i], this.#valList[i]]; + } + } + } + /** + * Return a generator yielding the keys in the cache, + * in order from most recently used to least recently used. + */ + *keys() { + for (const i of this.#indexes()) { + const k = this.#keyList[i]; + if (k !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield k; + } + } + } + /** + * Inverse order version of {@link LRUCache.keys} + * + * Return a generator yielding the keys in the cache, + * in order from least recently used to most recently used. + */ + *rkeys() { + for (const i of this.#rindexes()) { + const k = this.#keyList[i]; + if (k !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield k; + } + } + } + /** + * Return a generator yielding the values in the cache, + * in order from most recently used to least recently used. + */ + *values() { + for (const i of this.#indexes()) { + const v = this.#valList[i]; + if (v !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield this.#valList[i]; + } + } + } + /** + * Inverse order version of {@link LRUCache.values} + * + * Return a generator yielding the values in the cache, + * in order from least recently used to most recently used. + */ + *rvalues() { + for (const i of this.#rindexes()) { + const v = this.#valList[i]; + if (v !== undefined && + !this.#isBackgroundFetch(this.#valList[i])) { + yield this.#valList[i]; + } + } + } + /** + * Iterating over the cache itself yields the same results as + * {@link LRUCache.entries} + */ + [Symbol.iterator]() { + return this.entries(); + } + /** + * A String value that is used in the creation of the default string description of an object. + * Called by the built-in method Object.prototype.toString. + */ + [Symbol.toStringTag] = 'LRUCache'; + /** + * Find a value for which the supplied fn method returns a truthy value, + * similar to Array.find(). fn is called as fn(value, key, cache). + */ + find(fn, getOptions = {}) { + for (const i of this.#indexes()) { + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + continue; + if (fn(value, this.#keyList[i], this)) { + return this.get(this.#keyList[i], getOptions); + } + } + } + /** + * Call the supplied function on each item in the cache, in order from + * most recently used to least recently used. fn is called as + * fn(value, key, cache). Does not update age or recenty of use. + * Does not iterate over stale values. + */ + forEach(fn, thisp = this) { + for (const i of this.#indexes()) { + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + continue; + fn.call(thisp, value, this.#keyList[i], this); + } + } + /** + * The same as {@link LRUCache.forEach} but items are iterated over in + * reverse order. (ie, less recently used items are iterated over first.) + */ + rforEach(fn, thisp = this) { + for (const i of this.#rindexes()) { + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + continue; + fn.call(thisp, value, this.#keyList[i], this); + } + } + /** + * Delete any stale entries. Returns true if anything was removed, + * false otherwise. + */ + purgeStale() { + let deleted = false; + for (const i of this.#rindexes({ allowStale: true })) { + if (this.#isStale(i)) { + this.delete(this.#keyList[i]); + deleted = true; + } + } + return deleted; + } + /** + * Get the extended info about a given entry, to get its value, size, and + * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a + * single key. Always returns stale values, if their info is found in the + * cache, so be sure to check for expired TTLs if relevant. + */ + info(key) { + const i = this.#keyMap.get(key); + if (i === undefined) + return undefined; + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined) + return undefined; + const entry = { value }; + if (this.#ttls && this.#starts) { + const ttl = this.#ttls[i]; + const start = this.#starts[i]; + if (ttl && start) { + const remain = ttl - (perf.now() - start); + entry.ttl = remain; + entry.start = Date.now(); + } + } + if (this.#sizes) { + entry.size = this.#sizes[i]; + } + return entry; + } + /** + * Return an array of [key, {@link LRUCache.Entry}] tuples which can be + * passed to cache.load() + */ + dump() { + const arr = []; + for (const i of this.#indexes({ allowStale: true })) { + const key = this.#keyList[i]; + const v = this.#valList[i]; + const value = this.#isBackgroundFetch(v) + ? v.__staleWhileFetching + : v; + if (value === undefined || key === undefined) + continue; + const entry = { value }; + if (this.#ttls && this.#starts) { + entry.ttl = this.#ttls[i]; + // always dump the start relative to a portable timestamp + // it's ok for this to be a bit slow, it's a rare operation. + const age = perf.now() - this.#starts[i]; + entry.start = Math.floor(Date.now() - age); + } + if (this.#sizes) { + entry.size = this.#sizes[i]; + } + arr.unshift([key, entry]); + } + return arr; + } + /** + * Reset the cache and load in the items in entries in the order listed. + * Note that the shape of the resulting cache may be different if the + * same options are not used in both caches. + */ + load(arr) { + this.clear(); + for (const [key, entry] of arr) { + if (entry.start) { + // entry.start is a portable timestamp, but we may be using + // node's performance.now(), so calculate the offset, so that + // we get the intended remaining TTL, no matter how long it's + // been on ice. + // + // it's ok for this to be a bit slow, it's a rare operation. + const age = Date.now() - entry.start; + entry.start = perf.now() - age; + } + this.set(key, entry.value, entry); + } + } + /** + * Add a value to the cache. + * + * Note: if `undefined` is specified as a value, this is an alias for + * {@link LRUCache#delete} + */ + set(k, v, setOptions = {}) { + if (v === undefined) { + this.delete(k); + return this; + } + const { ttl = this.ttl, start, noDisposeOnSet = this.noDisposeOnSet, sizeCalculation = this.sizeCalculation, status, } = setOptions; + let { noUpdateTTL = this.noUpdateTTL } = setOptions; + const size = this.#requireSize(k, v, setOptions.size || 0, sizeCalculation); + // if the item doesn't fit, don't do anything + // NB: maxEntrySize set to maxSize by default + if (this.maxEntrySize && size > this.maxEntrySize) { + if (status) { + status.set = 'miss'; + status.maxEntrySizeExceeded = true; + } + // have to delete, in case something is there already. + this.delete(k); + return this; + } + let index = this.#size === 0 ? undefined : this.#keyMap.get(k); + if (index === undefined) { + // addition + index = (this.#size === 0 + ? this.#tail + : this.#free.length !== 0 + ? this.#free.pop() + : this.#size === this.#max + ? this.#evict(false) + : this.#size); + this.#keyList[index] = k; + this.#valList[index] = v; + this.#keyMap.set(k, index); + this.#next[this.#tail] = index; + this.#prev[index] = this.#tail; + this.#tail = index; + this.#size++; + this.#addItemSize(index, size, status); + if (status) + status.set = 'add'; + noUpdateTTL = false; + } + else { + // update + this.#moveToTail(index); + const oldVal = this.#valList[index]; + if (v !== oldVal) { + if (this.#hasFetchMethod && this.#isBackgroundFetch(oldVal)) { + oldVal.__abortController.abort(new Error('replaced')); + const { __staleWhileFetching: s } = oldVal; + if (s !== undefined && !noDisposeOnSet) { + if (this.#hasDispose) { + this.#dispose?.(s, k, 'set'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([s, k, 'set']); + } + } + } + else if (!noDisposeOnSet) { + if (this.#hasDispose) { + this.#dispose?.(oldVal, k, 'set'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([oldVal, k, 'set']); + } + } + this.#removeItemSize(index); + this.#addItemSize(index, size, status); + this.#valList[index] = v; + if (status) { + status.set = 'replace'; + const oldValue = oldVal && this.#isBackgroundFetch(oldVal) + ? oldVal.__staleWhileFetching + : oldVal; + if (oldValue !== undefined) + status.oldValue = oldValue; + } + } + else if (status) { + status.set = 'update'; + } + } + if (ttl !== 0 && !this.#ttls) { + this.#initializeTTLTracking(); + } + if (this.#ttls) { + if (!noUpdateTTL) { + this.#setItemTTL(index, ttl, start); + } + if (status) + this.#statusTTL(status, index); + } + if (!noDisposeOnSet && this.#hasDisposeAfter && this.#disposed) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + return this; + } + /** + * Evict the least recently used item, returning its value or + * `undefined` if cache is empty. + */ + pop() { + try { + while (this.#size) { + const val = this.#valList[this.#head]; + this.#evict(true); + if (this.#isBackgroundFetch(val)) { + if (val.__staleWhileFetching) { + return val.__staleWhileFetching; + } + } + else if (val !== undefined) { + return val; + } + } + } + finally { + if (this.#hasDisposeAfter && this.#disposed) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + } + } + #evict(free) { + const head = this.#head; + const k = this.#keyList[head]; + const v = this.#valList[head]; + if (this.#hasFetchMethod && this.#isBackgroundFetch(v)) { + v.__abortController.abort(new Error('evicted')); + } + else if (this.#hasDispose || this.#hasDisposeAfter) { + if (this.#hasDispose) { + this.#dispose?.(v, k, 'evict'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([v, k, 'evict']); + } + } + this.#removeItemSize(head); + // if we aren't about to use the index, then null these out + if (free) { + this.#keyList[head] = undefined; + this.#valList[head] = undefined; + this.#free.push(head); + } + if (this.#size === 1) { + this.#head = this.#tail = 0; + this.#free.length = 0; + } + else { + this.#head = this.#next[head]; + } + this.#keyMap.delete(k); + this.#size--; + return head; + } + /** + * Check if a key is in the cache, without updating the recency of use. + * Will return false if the item is stale, even though it is technically + * in the cache. + * + * Will not update item age unless + * {@link LRUCache.OptionsBase.updateAgeOnHas} is set. + */ + has(k, hasOptions = {}) { + const { updateAgeOnHas = this.updateAgeOnHas, status } = hasOptions; + const index = this.#keyMap.get(k); + if (index !== undefined) { + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v) && + v.__staleWhileFetching === undefined) { + return false; + } + if (!this.#isStale(index)) { + if (updateAgeOnHas) { + this.#updateItemAge(index); + } + if (status) { + status.has = 'hit'; + this.#statusTTL(status, index); + } + return true; + } + else if (status) { + status.has = 'stale'; + this.#statusTTL(status, index); + } + } + else if (status) { + status.has = 'miss'; + } + return false; + } + /** + * Like {@link LRUCache#get} but doesn't update recency or delete stale + * items. + * + * Returns `undefined` if the item is stale, unless + * {@link LRUCache.OptionsBase.allowStale} is set. + */ + peek(k, peekOptions = {}) { + const { allowStale = this.allowStale } = peekOptions; + const index = this.#keyMap.get(k); + if (index === undefined || + (!allowStale && this.#isStale(index))) { + return; + } + const v = this.#valList[index]; + // either stale and allowed, or forcing a refresh of non-stale value + return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v; + } + #backgroundFetch(k, index, options, context) { + const v = index === undefined ? undefined : this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + return v; + } + const ac = new AC(); + const { signal } = options; + // when/if our AC signals, then stop listening to theirs. + signal?.addEventListener('abort', () => ac.abort(signal.reason), { + signal: ac.signal, + }); + const fetchOpts = { + signal: ac.signal, + options, + context, + }; + const cb = (v, updateCache = false) => { + const { aborted } = ac.signal; + const ignoreAbort = options.ignoreFetchAbort && v !== undefined; + if (options.status) { + if (aborted && !updateCache) { + options.status.fetchAborted = true; + options.status.fetchError = ac.signal.reason; + if (ignoreAbort) + options.status.fetchAbortIgnored = true; + } + else { + options.status.fetchResolved = true; + } + } + if (aborted && !ignoreAbort && !updateCache) { + return fetchFail(ac.signal.reason); + } + // either we didn't abort, and are still here, or we did, and ignored + const bf = p; + if (this.#valList[index] === p) { + if (v === undefined) { + if (bf.__staleWhileFetching) { + this.#valList[index] = bf.__staleWhileFetching; + } + else { + this.delete(k); + } + } + else { + if (options.status) + options.status.fetchUpdated = true; + this.set(k, v, fetchOpts.options); + } + } + return v; + }; + const eb = (er) => { + if (options.status) { + options.status.fetchRejected = true; + options.status.fetchError = er; + } + return fetchFail(er); + }; + const fetchFail = (er) => { + const { aborted } = ac.signal; + const allowStaleAborted = aborted && options.allowStaleOnFetchAbort; + const allowStale = allowStaleAborted || options.allowStaleOnFetchRejection; + const noDelete = allowStale || options.noDeleteOnFetchRejection; + const bf = p; + if (this.#valList[index] === p) { + // if we allow stale on fetch rejections, then we need to ensure that + // the stale value is not removed from the cache when the fetch fails. + const del = !noDelete || bf.__staleWhileFetching === undefined; + if (del) { + this.delete(k); + } + else if (!allowStaleAborted) { + // still replace the *promise* with the stale value, + // since we are done with the promise at this point. + // leave it untouched if we're still waiting for an + // aborted background fetch that hasn't yet returned. + this.#valList[index] = bf.__staleWhileFetching; + } + } + if (allowStale) { + if (options.status && bf.__staleWhileFetching !== undefined) { + options.status.returnedStale = true; + } + return bf.__staleWhileFetching; + } + else if (bf.__returned === bf) { + throw er; + } + }; + const pcall = (res, rej) => { + const fmp = this.#fetchMethod?.(k, v, fetchOpts); + if (fmp && fmp instanceof Promise) { + fmp.then(v => res(v === undefined ? undefined : v), rej); + } + // ignored, we go until we finish, regardless. + // defer check until we are actually aborting, + // so fetchMethod can override. + ac.signal.addEventListener('abort', () => { + if (!options.ignoreFetchAbort || + options.allowStaleOnFetchAbort) { + res(undefined); + // when it eventually resolves, update the cache. + if (options.allowStaleOnFetchAbort) { + res = v => cb(v, true); + } + } + }); + }; + if (options.status) + options.status.fetchDispatched = true; + const p = new Promise(pcall).then(cb, eb); + const bf = Object.assign(p, { + __abortController: ac, + __staleWhileFetching: v, + __returned: undefined, + }); + if (index === undefined) { + // internal, don't expose status. + this.set(k, bf, { ...fetchOpts.options, status: undefined }); + index = this.#keyMap.get(k); + } + else { + this.#valList[index] = bf; + } + return bf; + } + #isBackgroundFetch(p) { + if (!this.#hasFetchMethod) + return false; + const b = p; + return (!!b && + b instanceof Promise && + b.hasOwnProperty('__staleWhileFetching') && + b.__abortController instanceof AC); + } + async fetch(k, fetchOptions = {}) { + const { + // get options + allowStale = this.allowStale, updateAgeOnGet = this.updateAgeOnGet, noDeleteOnStaleGet = this.noDeleteOnStaleGet, + // set options + ttl = this.ttl, noDisposeOnSet = this.noDisposeOnSet, size = 0, sizeCalculation = this.sizeCalculation, noUpdateTTL = this.noUpdateTTL, + // fetch exclusive options + noDeleteOnFetchRejection = this.noDeleteOnFetchRejection, allowStaleOnFetchRejection = this.allowStaleOnFetchRejection, ignoreFetchAbort = this.ignoreFetchAbort, allowStaleOnFetchAbort = this.allowStaleOnFetchAbort, context, forceRefresh = false, status, signal, } = fetchOptions; + if (!this.#hasFetchMethod) { + if (status) + status.fetch = 'get'; + return this.get(k, { + allowStale, + updateAgeOnGet, + noDeleteOnStaleGet, + status, + }); + } + const options = { + allowStale, + updateAgeOnGet, + noDeleteOnStaleGet, + ttl, + noDisposeOnSet, + size, + sizeCalculation, + noUpdateTTL, + noDeleteOnFetchRejection, + allowStaleOnFetchRejection, + allowStaleOnFetchAbort, + ignoreFetchAbort, + status, + signal, + }; + let index = this.#keyMap.get(k); + if (index === undefined) { + if (status) + status.fetch = 'miss'; + const p = this.#backgroundFetch(k, index, options, context); + return (p.__returned = p); + } + else { + // in cache, maybe already fetching + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + const stale = allowStale && v.__staleWhileFetching !== undefined; + if (status) { + status.fetch = 'inflight'; + if (stale) + status.returnedStale = true; + } + return stale ? v.__staleWhileFetching : (v.__returned = v); + } + // if we force a refresh, that means do NOT serve the cached value, + // unless we are already in the process of refreshing the cache. + const isStale = this.#isStale(index); + if (!forceRefresh && !isStale) { + if (status) + status.fetch = 'hit'; + this.#moveToTail(index); + if (updateAgeOnGet) { + this.#updateItemAge(index); + } + if (status) + this.#statusTTL(status, index); + return v; + } + // ok, it is stale or a forced refresh, and not already fetching. + // refresh the cache. + const p = this.#backgroundFetch(k, index, options, context); + const hasStale = p.__staleWhileFetching !== undefined; + const staleVal = hasStale && allowStale; + if (status) { + status.fetch = isStale ? 'stale' : 'refresh'; + if (staleVal && isStale) + status.returnedStale = true; + } + return staleVal ? p.__staleWhileFetching : (p.__returned = p); + } + } + /** + * Return a value from the cache. Will update the recency of the cache + * entry found. + * + * If the key is not found, get() will return `undefined`. + */ + get(k, getOptions = {}) { + const { allowStale = this.allowStale, updateAgeOnGet = this.updateAgeOnGet, noDeleteOnStaleGet = this.noDeleteOnStaleGet, status, } = getOptions; + const index = this.#keyMap.get(k); + if (index !== undefined) { + const value = this.#valList[index]; + const fetching = this.#isBackgroundFetch(value); + if (status) + this.#statusTTL(status, index); + if (this.#isStale(index)) { + if (status) + status.get = 'stale'; + // delete only if not an in-flight background fetch + if (!fetching) { + if (!noDeleteOnStaleGet) { + this.delete(k); + } + if (status && allowStale) + status.returnedStale = true; + return allowStale ? value : undefined; + } + else { + if (status && + allowStale && + value.__staleWhileFetching !== undefined) { + status.returnedStale = true; + } + return allowStale ? value.__staleWhileFetching : undefined; + } + } + else { + if (status) + status.get = 'hit'; + // if we're currently fetching it, we don't actually have it yet + // it's not stale, which means this isn't a staleWhileRefetching. + // If it's not stale, and fetching, AND has a __staleWhileFetching + // value, then that means the user fetched with {forceRefresh:true}, + // so it's safe to return that value. + if (fetching) { + return value.__staleWhileFetching; + } + this.#moveToTail(index); + if (updateAgeOnGet) { + this.#updateItemAge(index); + } + return value; + } + } + else if (status) { + status.get = 'miss'; + } + } + #connect(p, n) { + this.#prev[n] = p; + this.#next[p] = n; + } + #moveToTail(index) { + // if tail already, nothing to do + // if head, move head to next[index] + // else + // move next[prev[index]] to next[index] (head has no prev) + // move prev[next[index]] to prev[index] + // prev[index] = tail + // next[tail] = index + // tail = index + if (index !== this.#tail) { + if (index === this.#head) { + this.#head = this.#next[index]; + } + else { + this.#connect(this.#prev[index], this.#next[index]); + } + this.#connect(this.#tail, index); + this.#tail = index; + } + } + /** + * Deletes a key out of the cache. + * Returns true if the key was deleted, false otherwise. + */ + delete(k) { + let deleted = false; + if (this.#size !== 0) { + const index = this.#keyMap.get(k); + if (index !== undefined) { + deleted = true; + if (this.#size === 1) { + this.clear(); + } + else { + this.#removeItemSize(index); + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + v.__abortController.abort(new Error('deleted')); + } + else if (this.#hasDispose || this.#hasDisposeAfter) { + if (this.#hasDispose) { + this.#dispose?.(v, k, 'delete'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([v, k, 'delete']); + } + } + this.#keyMap.delete(k); + this.#keyList[index] = undefined; + this.#valList[index] = undefined; + if (index === this.#tail) { + this.#tail = this.#prev[index]; + } + else if (index === this.#head) { + this.#head = this.#next[index]; + } + else { + const pi = this.#prev[index]; + this.#next[pi] = this.#next[index]; + const ni = this.#next[index]; + this.#prev[ni] = this.#prev[index]; + } + this.#size--; + this.#free.push(index); + } + } + } + if (this.#hasDisposeAfter && this.#disposed?.length) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + return deleted; + } + /** + * Clear the cache entirely, throwing away all values. + */ + clear() { + for (const index of this.#rindexes({ allowStale: true })) { + const v = this.#valList[index]; + if (this.#isBackgroundFetch(v)) { + v.__abortController.abort(new Error('deleted')); + } + else { + const k = this.#keyList[index]; + if (this.#hasDispose) { + this.#dispose?.(v, k, 'delete'); + } + if (this.#hasDisposeAfter) { + this.#disposed?.push([v, k, 'delete']); + } + } + } + this.#keyMap.clear(); + this.#valList.fill(undefined); + this.#keyList.fill(undefined); + if (this.#ttls && this.#starts) { + this.#ttls.fill(0); + this.#starts.fill(0); + } + if (this.#sizes) { + this.#sizes.fill(0); + } + this.#head = 0; + this.#tail = 0; + this.#free.length = 0; + this.#calculatedSize = 0; + this.#size = 0; + if (this.#hasDisposeAfter && this.#disposed) { + const dt = this.#disposed; + let task; + while ((task = dt?.shift())) { + this.#disposeAfter?.(...task); + } + } + } +} +export default LRUCache; +//# sourceMappingURL=index.js.map \ No newline at end of file diff --git a/dist/esm/index.js.map b/dist/esm/index.js.map new file mode 100644 index 0000000..451f311 --- /dev/null +++ b/dist/esm/index.js.map @@ -0,0 +1 @@ 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* @module LRUCache\n */\n\n// module-private names and types\ntype Perf = { now: () => number }\nconst perf: Perf =\n typeof performance === 'object' &&\n performance &&\n typeof performance.now === 'function'\n ? performance\n : Date\n\nconst warned = new Set()\n\n// either a function or a class\ntype ForC = ((...a: any[]) => any) | { new (...a: any[]): any }\n\n/* c8 ignore start */\nconst PROCESS = (\n typeof process === 'object' && !!process ? process : {}\n) as { [k: string]: any }\n/* c8 ignore start */\n\nconst emitWarning = (\n msg: string,\n type: string,\n code: string,\n fn: ForC\n) => {\n typeof PROCESS.emitWarning === 'function'\n ? PROCESS.emitWarning(msg, type, code, fn)\n : console.error(`[${code}] ${type}: ${msg}`)\n}\n\nlet AC = globalThis.AbortController\nlet AS = globalThis.AbortSignal\n\n/* c8 ignore start */\nif (typeof AC === 'undefined') {\n //@ts-ignore\n AS = class AbortSignal {\n onabort?: (...a: any[]) => any\n _onabort: ((...a: any[]) => any)[] = []\n reason?: any\n aborted: boolean = false\n addEventListener(_: string, fn: (...a: any[]) => any) {\n this._onabort.push(fn)\n }\n }\n //@ts-ignore\n AC = class AbortController {\n constructor() {\n warnACPolyfill()\n }\n signal = new AS()\n abort(reason: any) {\n if (this.signal.aborted) return\n //@ts-ignore\n this.signal.reason = reason\n //@ts-ignore\n this.signal.aborted = true\n //@ts-ignore\n for (const fn of this.signal._onabort) {\n fn(reason)\n }\n this.signal.onabort?.(reason)\n }\n }\n let printACPolyfillWarning =\n PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'\n const warnACPolyfill = () => {\n if (!printACPolyfillWarning) return\n printACPolyfillWarning = false\n emitWarning(\n 'AbortController is not defined. If using lru-cache in ' +\n 'node 14, load an AbortController polyfill from the ' +\n '`node-abort-controller` package. A minimal polyfill is ' +\n 'provided for use by LRUCache.fetch(), but it should not be ' +\n 'relied upon in other contexts (eg, passing it to other APIs that ' +\n 'use AbortController/AbortSignal might have undesirable effects). ' +\n 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.',\n 'NO_ABORT_CONTROLLER',\n 'ENOTSUP',\n warnACPolyfill\n )\n }\n}\n/* c8 ignore stop */\n\nconst shouldWarn = (code: string) => !warned.has(code)\n\nconst TYPE = Symbol('type')\nexport type PosInt = number & { [TYPE]: 'Positive Integer' }\nexport type Index = number & { [TYPE]: 'LRUCache Index' }\n\nconst isPosInt = (n: any): n is PosInt =>\n n && n === Math.floor(n) && n > 0 && isFinite(n)\n\nexport type UintArray = Uint8Array | Uint16Array | Uint32Array\nexport type NumberArray = UintArray | number[]\n\n/* c8 ignore start */\n// This is a little bit ridiculous, tbh.\n// The maximum array length is 2^32-1 or thereabouts on most JS impls.\n// And well before that point, you're caching the entire world, I mean,\n// that's ~32GB of just integers for the next/prev links, plus whatever\n// else to hold that many keys and values. Just filling the memory with\n// zeroes at init time is brutal when you get that big.\n// But why not be complete?\n// Maybe in the future, these limits will have expanded.\nconst getUintArray = (max: number) =>\n !isPosInt(max)\n ? null\n : max <= Math.pow(2, 8)\n ? Uint8Array\n : max <= Math.pow(2, 16)\n ? Uint16Array\n : max <= Math.pow(2, 32)\n ? Uint32Array\n : max <= Number.MAX_SAFE_INTEGER\n ? ZeroArray\n : null\n/* c8 ignore stop */\n\nclass ZeroArray extends Array {\n constructor(size: number) {\n super(size)\n this.fill(0)\n }\n}\nexport type { ZeroArray }\nexport type { Stack }\n\nexport type StackLike = Stack | Index[]\nclass Stack {\n heap: NumberArray\n length: number\n // private constructor\n static #constructing: boolean = false\n static create(max: number): StackLike {\n const HeapCls = getUintArray(max)\n if (!HeapCls) return []\n Stack.#constructing = true\n const s = new Stack(max, HeapCls)\n Stack.#constructing = false\n return s\n }\n constructor(\n max: number,\n HeapCls: { new (n: number): NumberArray }\n ) {\n /* c8 ignore start */\n if (!Stack.#constructing) {\n throw new TypeError('instantiate Stack using Stack.create(n)')\n }\n /* c8 ignore stop */\n this.heap = new HeapCls(max)\n this.length = 0\n }\n push(n: Index) {\n this.heap[this.length++] = n\n }\n pop(): Index {\n return this.heap[--this.length] as Index\n }\n}\n\n/**\n * Promise representing an in-progress {@link LRUCache#fetch} call\n */\nexport type BackgroundFetch = Promise & {\n __returned: BackgroundFetch | undefined\n __abortController: AbortController\n __staleWhileFetching: V | undefined\n}\n\nexport type DisposeTask = [\n value: V,\n key: K,\n reason: LRUCache.DisposeReason\n]\n\nexport namespace LRUCache {\n /**\n * An integer greater than 0, reflecting the calculated size of items\n */\n export type Size = number\n\n /**\n * Integer greater than 0, representing some number of milliseconds, or the\n * time at which a TTL started counting from.\n */\n export type Milliseconds = number\n\n /**\n * An integer greater than 0, reflecting a number of items\n */\n export type Count = number\n\n /**\n * The reason why an item was removed from the cache, passed\n * to the {@link Disposer} methods.\n */\n export type DisposeReason = 'evict' | 'set' | 'delete'\n /**\n * A method called upon item removal, passed as the\n * {@link OptionsBase.dispose} and/or\n * {@link OptionsBase.disposeAfter} options.\n */\n export type Disposer = (\n value: V,\n key: K,\n reason: DisposeReason\n ) => void\n\n /**\n * A function that returns the effective calculated size\n * of an entry in the cache.\n */\n export type SizeCalculator = (value: V, key: K) => Size\n\n /**\n * Options provided to the\n * {@link OptionsBase.fetchMethod} function.\n */\n export interface FetcherOptions {\n signal: AbortSignal\n options: FetcherFetchOptions\n /**\n * Object provided in the {@link FetchOptions.context} option to\n * {@link LRUCache#fetch}\n */\n context: FC\n }\n\n /**\n * Status object that may be passed to {@link LRUCache#fetch},\n * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}.\n */\n export interface Status {\n /**\n * The status of a set() operation.\n *\n * - add: the item was not found in the cache, and was added\n * - update: the item was in the cache, with the same value provided\n * - replace: the item was in the cache, and replaced\n * - miss: the item was not added to the cache for some reason\n */\n set?: 'add' | 'update' | 'replace' | 'miss'\n\n /**\n * the ttl stored for the item, or undefined if ttls are not used.\n */\n ttl?: Milliseconds\n\n /**\n * the start time for the item, or undefined if ttls are not used.\n */\n start?: Milliseconds\n\n /**\n * The timestamp used for TTL calculation\n */\n now?: Milliseconds\n\n /**\n * the remaining ttl for the item, or undefined if ttls are not used.\n */\n remainingTTL?: Milliseconds\n\n /**\n * The calculated size for the item, if sizes are used.\n */\n entrySize?: Size\n\n /**\n * The total calculated size of the cache, if sizes are used.\n */\n totalCalculatedSize?: Size\n\n /**\n * A flag indicating that the item was not stored, due to exceeding the\n * {@link OptionsBase.maxEntrySize}\n */\n maxEntrySizeExceeded?: true\n\n /**\n * The old value, specified in the case of `set:'update'` or\n * `set:'replace'`\n */\n oldValue?: V\n\n /**\n * The results of a {@link LRUCache#has} operation\n *\n * - hit: the item was found in the cache\n * - stale: the item was found in the cache, but is stale\n * - miss: the item was not found in the cache\n */\n has?: 'hit' | 'stale' | 'miss'\n\n /**\n * The status of a {@link LRUCache#fetch} operation.\n * Note that this can change as the underlying fetch() moves through\n * various states.\n *\n * - inflight: there is another fetch() for this key which is in process\n * - get: there is no fetchMethod, so {@link LRUCache#get} was called.\n * - miss: the item is not in cache, and will be fetched.\n * - hit: the item is in the cache, and was resolved immediately.\n * - stale: the item is in the cache, but stale.\n * - refresh: the item is in the cache, and not stale, but\n * {@link FetchOptions.forceRefresh} was specified.\n */\n fetch?: 'get' | 'inflight' | 'miss' | 'hit' | 'stale' | 'refresh'\n\n /**\n * The {@link OptionsBase.fetchMethod} was called\n */\n fetchDispatched?: true\n\n /**\n * The cached value was updated after a successful call to\n * {@link OptionsBase.fetchMethod}\n */\n fetchUpdated?: true\n\n /**\n * The reason for a fetch() rejection. Either the error raised by the\n * {@link OptionsBase.fetchMethod}, or the reason for an\n * AbortSignal.\n */\n fetchError?: Error\n\n /**\n * The fetch received an abort signal\n */\n fetchAborted?: true\n\n /**\n * The abort signal received was ignored, and the fetch was allowed to\n * continue.\n */\n fetchAbortIgnored?: true\n\n /**\n * The fetchMethod promise resolved successfully\n */\n fetchResolved?: true\n\n /**\n * The fetchMethod promise was rejected\n */\n fetchRejected?: true\n\n /**\n * The status of a {@link LRUCache#get} operation.\n *\n * - fetching: The item is currently being fetched. If a previous value\n * is present and allowed, that will be returned.\n * - stale: The item is in the cache, and is stale.\n * - hit: the item is in the cache\n * - miss: the item is not in the cache\n */\n get?: 'stale' | 'hit' | 'miss'\n\n /**\n * A fetch or get operation returned a stale value.\n */\n returnedStale?: true\n }\n\n /**\n * options which override the options set in the LRUCache constructor\n * when calling {@link LRUCache#fetch}.\n *\n * This is the union of {@link GetOptions} and {@link SetOptions}, plus\n * {@link OptionsBase.noDeleteOnFetchRejection},\n * {@link OptionsBase.allowStaleOnFetchRejection},\n * {@link FetchOptions.forceRefresh}, and\n * {@link FetcherOptions.context}\n *\n * Any of these may be modified in the {@link OptionsBase.fetchMethod}\n * function, but the {@link GetOptions} fields will of course have no\n * effect, as the {@link LRUCache#get} call already happened by the time\n * the fetchMethod is called.\n */\n export interface FetcherFetchOptions\n extends Pick<\n OptionsBase,\n | 'allowStale'\n | 'updateAgeOnGet'\n | 'noDeleteOnStaleGet'\n | 'sizeCalculation'\n | 'ttl'\n | 'noDisposeOnSet'\n | 'noUpdateTTL'\n | 'noDeleteOnFetchRejection'\n | 'allowStaleOnFetchRejection'\n | 'ignoreFetchAbort'\n | 'allowStaleOnFetchAbort'\n > {\n status?: Status\n size?: Size\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#fetch} method.\n */\n export interface FetchOptions\n extends FetcherFetchOptions {\n /**\n * Set to true to force a re-load of the existing data, even if it\n * is not yet stale.\n */\n forceRefresh?: boolean\n /**\n * Context provided to the {@link OptionsBase.fetchMethod} as\n * the {@link FetcherOptions.context} param.\n *\n * If the FC type is specified as unknown (the default),\n * undefined or void, then this is optional. Otherwise, it will\n * be required.\n */\n context?: FC\n signal?: AbortSignal\n status?: Status\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is something\n * other than `unknown`, `undefined`, or `void`\n */\n export interface FetchOptionsWithContext\n extends FetchOptions {\n context: FC\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is\n * `undefined` or `void`\n */\n export interface FetchOptionsNoContext\n extends FetchOptions {\n context?: undefined\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#has} method.\n */\n export interface HasOptions\n extends Pick, 'updateAgeOnHas'> {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#get} method.\n */\n export interface GetOptions\n extends Pick<\n OptionsBase,\n 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'\n > {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#peek} method.\n */\n export interface PeekOptions\n extends Pick, 'allowStale'> {}\n\n /**\n * Options that may be passed to the {@link LRUCache#set} method.\n */\n export interface SetOptions\n extends Pick<\n OptionsBase,\n 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL'\n > {\n /**\n * If size tracking is enabled, then setting an explicit size\n * in the {@link LRUCache#set} call will prevent calling the\n * {@link OptionsBase.sizeCalculation} function.\n */\n size?: Size\n /**\n * If TTL tracking is enabled, then setting an explicit start\n * time in the {@link LRUCache#set} call will override the\n * default time from `performance.now()` or `Date.now()`.\n *\n * Note that it must be a valid value for whichever time-tracking\n * method is in use.\n */\n start?: Milliseconds\n status?: Status\n }\n\n /**\n * The type signature for the {@link OptionsBase.fetchMethod} option.\n */\n export type Fetcher = (\n key: K,\n staleValue: V | undefined,\n options: FetcherOptions\n ) => Promise | V | undefined | void\n\n /**\n * Options which may be passed to the {@link LRUCache} constructor.\n *\n * Most of these may be overridden in the various options that use\n * them.\n *\n * Despite all being technically optional, the constructor requires that\n * a cache is at minimum limited by one or more of {@link OptionsBase.max},\n * {@link OptionsBase.ttl}, or {@link OptionsBase.maxSize}.\n *\n * If {@link OptionsBase.ttl} is used alone, then it is strongly advised\n * (and in fact required by the type definitions here) that the cache\n * also set {@link OptionsBase.ttlAutopurge}, to prevent potentially\n * unbounded storage.\n */\n export interface OptionsBase {\n /**\n * The maximum number of items to store in the cache before evicting\n * old entries. This is read-only on the {@link LRUCache} instance,\n * and may not be overridden.\n *\n * If set, then storage space will be pre-allocated at construction\n * time, and the cache will perform significantly faster.\n *\n * Note that significantly fewer items may be stored, if\n * {@link OptionsBase.maxSize} and/or {@link OptionsBase.ttl} are also\n * set.\n */\n max?: Count\n\n /**\n * Max time in milliseconds for items to live in cache before they are\n * considered stale. Note that stale items are NOT preemptively removed\n * by default, and MAY live in the cache long after they have expired.\n *\n * Also, as this cache is optimized for LRU/MRU operations, some of\n * the staleness/TTL checks will reduce performance, as they will incur\n * overhead by deleting items.\n *\n * Must be an integer number of ms. If set to 0, this indicates \"no TTL\"\n *\n * @default 0\n */\n ttl?: Milliseconds\n\n /**\n * Minimum amount of time in ms in which to check for staleness.\n * Defaults to 1, which means that the current time is checked\n * at most once per millisecond.\n *\n * Set to 0 to check the current time every time staleness is tested.\n * (This reduces performance, and is theoretically unnecessary.)\n *\n * Setting this to a higher value will improve performance somewhat\n * while using ttl tracking, albeit at the expense of keeping stale\n * items around a bit longer than their TTLs would indicate.\n *\n * @default 1\n */\n ttlResolution?: Milliseconds\n\n /**\n * Preemptively remove stale items from the cache.\n * Note that this may significantly degrade performance,\n * especially if the cache is storing a large number of items.\n * It is almost always best to just leave the stale items in\n * the cache, and let them fall out as new items are added.\n *\n * Note that this means that {@link OptionsBase.allowStale} is a bit\n * pointless, as stale items will be deleted almost as soon as they\n * expire.\n *\n * @default false\n */\n ttlAutopurge?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#get}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnGet?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#has}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnHas?: boolean\n\n /**\n * Allow {@link LRUCache#get} and {@link LRUCache#fetch} calls to return\n * stale data, if available.\n */\n allowStale?: boolean\n\n /**\n * Function that is called on items when they are dropped from the cache.\n * This can be handy if you want to close file descriptors or do other\n * cleanup tasks when items are no longer accessible. Called with `key,\n * value`. It's called before actually removing the item from the\n * internal cache, so it is *NOT* safe to re-add them.\n *\n * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after\n * they have been full removed, when it is safe to add them back to the\n * cache.\n */\n dispose?: Disposer\n\n /**\n * The same as {@link OptionsBase.dispose}, but called *after* the entry\n * is completely removed and the cache is once again in a clean state.\n * It is safe to add an item right back into the cache at this point.\n * However, note that it is *very* easy to inadvertently create infinite\n * recursion this way.\n */\n disposeAfter?: Disposer\n\n /**\n * Set to true to suppress calling the\n * {@link OptionsBase.dispose} function if the entry key is\n * still accessible within the cache.\n * This may be overridden by passing an options object to\n * {@link LRUCache#set}.\n */\n noDisposeOnSet?: boolean\n\n /**\n * Boolean flag to tell the cache to not update the TTL when\n * setting a new value for an existing key (ie, when updating a value\n * rather than inserting a new value). Note that the TTL value is\n * _always_ set (if provided) when adding a new entry into the cache.\n *\n * Has no effect if a {@link OptionsBase.ttl} is not set.\n */\n noUpdateTTL?: boolean\n\n /**\n * If you wish to track item size, you must provide a maxSize\n * note that we still will only keep up to max *actual items*,\n * if max is set, so size tracking may cause fewer than max items\n * to be stored. At the extreme, a single item of maxSize size\n * will cause everything else in the cache to be dropped when it\n * is added. Use with caution!\n *\n * Note also that size tracking can negatively impact performance,\n * though for most cases, only minimally.\n */\n maxSize?: Size\n\n /**\n * The maximum allowed size for any single item in the cache.\n *\n * If a larger item is passed to {@link LRUCache#set} or returned by a\n * {@link OptionsBase.fetchMethod}, then it will not be stored in the\n * cache.\n */\n maxEntrySize?: Size\n\n /**\n * A function that returns a number indicating the item's size.\n *\n * If not provided, and {@link OptionsBase.maxSize} or\n * {@link OptionsBase.maxEntrySize} are set, then all\n * {@link LRUCache#set} calls **must** provide an explicit\n * {@link SetOptions.size} or sizeCalculation param.\n */\n sizeCalculation?: SizeCalculator\n\n /**\n * Method that provides the implementation for {@link LRUCache#fetch}\n */\n fetchMethod?: Fetcher\n\n /**\n * Set to true to suppress the deletion of stale data when a\n * {@link OptionsBase.fetchMethod} returns a rejected promise.\n */\n noDeleteOnFetchRejection?: boolean\n\n /**\n * Do not delete stale items when they are retrieved with\n * {@link LRUCache#get}.\n *\n * Note that the `get` return value will still be `undefined`\n * unless {@link OptionsBase.allowStale} is true.\n */\n noDeleteOnStaleGet?: boolean\n\n /**\n * Set to true to allow returning stale data when a\n * {@link OptionsBase.fetchMethod} throws an error or returns a rejected\n * promise.\n *\n * This differs from using {@link OptionsBase.allowStale} in that stale\n * data will ONLY be returned in the case that the\n * {@link LRUCache#fetch} fails, not any other times.\n */\n allowStaleOnFetchRejection?: boolean\n\n /**\n * Set to true to return a stale value from the cache when the\n * `AbortSignal` passed to the {@link OptionsBase.fetchMethod} dispatches an `'abort'`\n * event, whether user-triggered, or due to internal cache behavior.\n *\n * Unless {@link OptionsBase.ignoreFetchAbort} is also set, the underlying\n * {@link OptionsBase.fetchMethod} will still be considered canceled, and\n * any value it returns will be ignored and not cached.\n *\n * Caveat: since fetches are aborted when a new value is explicitly\n * set in the cache, this can lead to fetch returning a stale value,\n * since that was the fallback value _at the moment the `fetch()` was\n * initiated_, even though the new updated value is now present in\n * the cache.\n *\n * For example:\n *\n * ```ts\n * const cache = new LRUCache({\n * ttl: 100,\n * fetchMethod: async (url, oldValue, { signal }) => {\n * const res = await fetch(url, { signal })\n * return await res.json()\n * }\n * })\n * cache.set('https://example.com/', { some: 'data' })\n * // 100ms go by...\n * const result = cache.fetch('https://example.com/')\n * cache.set('https://example.com/', { other: 'thing' })\n * console.log(await result) // { some: 'data' }\n * console.log(cache.get('https://example.com/')) // { other: 'thing' }\n * ```\n */\n allowStaleOnFetchAbort?: boolean\n\n /**\n * Set to true to ignore the `abort` event emitted by the `AbortSignal`\n * object passed to {@link OptionsBase.fetchMethod}, and still cache the\n * resulting resolution value, as long as it is not `undefined`.\n *\n * When used on its own, this means aborted {@link LRUCache#fetch} calls are not\n * immediately resolved or rejected when they are aborted, and instead\n * take the full time to await.\n *\n * When used with {@link OptionsBase.allowStaleOnFetchAbort}, aborted\n * {@link LRUCache#fetch} calls will resolve immediately to their stale\n * cached value or `undefined`, and will continue to process and eventually\n * update the cache when they resolve, as long as the resulting value is\n * not `undefined`, thus supporting a \"return stale on timeout while\n * refreshing\" mechanism by passing `AbortSignal.timeout(n)` as the signal.\n *\n * **Note**: regardless of this setting, an `abort` event _is still\n * emitted on the `AbortSignal` object_, so may result in invalid results\n * when passed to other underlying APIs that use AbortSignals.\n *\n * This may be overridden in the {@link OptionsBase.fetchMethod} or the\n * call to {@link LRUCache#fetch}.\n */\n ignoreFetchAbort?: boolean\n }\n\n export interface OptionsMaxLimit\n extends OptionsBase {\n max: Count\n }\n export interface OptionsTTLLimit\n extends OptionsBase {\n ttl: Milliseconds\n ttlAutopurge: boolean\n }\n export interface OptionsSizeLimit\n extends OptionsBase {\n maxSize: Size\n }\n\n /**\n * The valid safe options for the {@link LRUCache} constructor\n */\n export type Options =\n | OptionsMaxLimit\n | OptionsSizeLimit\n | OptionsTTLLimit\n\n /**\n * Entry objects used by {@link LRUCache#load} and {@link LRUCache#dump},\n * and returned by {@link LRUCache#info}.\n */\n export interface Entry {\n value: V\n ttl?: Milliseconds\n size?: Size\n start?: Milliseconds\n }\n}\n\n/**\n * Default export, the thing you're using this module to get.\n *\n * All properties from the options object (with the exception of\n * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as\n * normal public members. (`max` and `maxBase` are read-only getters.)\n * Changing any of these will alter the defaults for subsequent method calls,\n * but is otherwise safe.\n */\nexport class LRUCache implements Map {\n // properties coming in from the options of these, only max and maxSize\n // really *need* to be protected. The rest can be modified, as they just\n // set defaults for various methods.\n readonly #max: LRUCache.Count\n readonly #maxSize: LRUCache.Size\n readonly #dispose?: LRUCache.Disposer\n readonly #disposeAfter?: LRUCache.Disposer\n readonly #fetchMethod?: LRUCache.Fetcher\n\n /**\n * {@link LRUCache.OptionsBase.ttl}\n */\n ttl: LRUCache.Milliseconds\n\n /**\n * {@link LRUCache.OptionsBase.ttlResolution}\n */\n ttlResolution: LRUCache.Milliseconds\n /**\n * {@link LRUCache.OptionsBase.ttlAutopurge}\n */\n ttlAutopurge: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnGet}\n */\n updateAgeOnGet: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnHas}\n */\n updateAgeOnHas: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStale}\n */\n allowStale: boolean\n\n /**\n * {@link LRUCache.OptionsBase.noDisposeOnSet}\n */\n noDisposeOnSet: boolean\n /**\n * {@link LRUCache.OptionsBase.noUpdateTTL}\n */\n noUpdateTTL: boolean\n /**\n * {@link LRUCache.OptionsBase.maxEntrySize}\n */\n maxEntrySize: LRUCache.Size\n /**\n * {@link LRUCache.OptionsBase.sizeCalculation}\n */\n sizeCalculation?: LRUCache.SizeCalculator\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection}\n */\n noDeleteOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnStaleGet}\n */\n noDeleteOnStaleGet: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort}\n */\n allowStaleOnFetchAbort: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection}\n */\n allowStaleOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.ignoreFetchAbort}\n */\n ignoreFetchAbort: boolean\n\n // computed properties\n #size: LRUCache.Count\n #calculatedSize: LRUCache.Size\n #keyMap: Map\n #keyList: (K | undefined)[]\n #valList: (V | BackgroundFetch | undefined)[]\n #next: NumberArray\n #prev: NumberArray\n #head: Index\n #tail: Index\n #free: StackLike\n #disposed?: DisposeTask[]\n #sizes?: ZeroArray\n #starts?: ZeroArray\n #ttls?: ZeroArray\n\n #hasDispose: boolean\n #hasFetchMethod: boolean\n #hasDisposeAfter: boolean\n\n /**\n * Do not call this method unless you need to inspect the\n * inner workings of the cache. If anything returned by this\n * object is modified in any way, strange breakage may occur.\n *\n * These fields are private for a reason!\n *\n * @internal\n */\n static unsafeExposeInternals<\n K extends {},\n V extends {},\n FC extends unknown = unknown\n >(c: LRUCache) {\n return {\n // properties\n starts: c.#starts,\n ttls: c.#ttls,\n sizes: c.#sizes,\n keyMap: c.#keyMap as Map,\n keyList: c.#keyList,\n valList: c.#valList,\n next: c.#next,\n prev: c.#prev,\n get head() {\n return c.#head\n },\n get tail() {\n return c.#tail\n },\n free: c.#free,\n // methods\n isBackgroundFetch: (p: any) => c.#isBackgroundFetch(p),\n backgroundFetch: (\n k: K,\n index: number | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch =>\n c.#backgroundFetch(\n k,\n index as Index | undefined,\n options,\n context\n ),\n moveToTail: (index: number): void =>\n c.#moveToTail(index as Index),\n indexes: (options?: { allowStale: boolean }) =>\n c.#indexes(options),\n rindexes: (options?: { allowStale: boolean }) =>\n c.#rindexes(options),\n isStale: (index: number | undefined) =>\n c.#isStale(index as Index),\n }\n }\n\n // Protected read-only members\n\n /**\n * {@link LRUCache.OptionsBase.max} (read-only)\n */\n get max(): LRUCache.Count {\n return this.#max\n }\n /**\n * {@link LRUCache.OptionsBase.maxSize} (read-only)\n */\n get maxSize(): LRUCache.Count {\n return this.#maxSize\n }\n /**\n * The total computed size of items in the cache (read-only)\n */\n get calculatedSize(): LRUCache.Size {\n return this.#calculatedSize\n }\n /**\n * The number of items stored in the cache (read-only)\n */\n get size(): LRUCache.Count {\n return this.#size\n }\n /**\n * {@link LRUCache.OptionsBase.fetchMethod} (read-only)\n */\n get fetchMethod(): LRUCache.Fetcher | undefined {\n return this.#fetchMethod\n }\n /**\n * {@link LRUCache.OptionsBase.dispose} (read-only)\n */\n get dispose() {\n return this.#dispose\n }\n /**\n * {@link LRUCache.OptionsBase.disposeAfter} (read-only)\n */\n get disposeAfter() {\n return this.#disposeAfter\n }\n\n constructor(\n options: LRUCache.Options | LRUCache\n ) {\n const {\n max = 0,\n ttl,\n ttlResolution = 1,\n ttlAutopurge,\n updateAgeOnGet,\n updateAgeOnHas,\n allowStale,\n dispose,\n disposeAfter,\n noDisposeOnSet,\n noUpdateTTL,\n maxSize = 0,\n maxEntrySize = 0,\n sizeCalculation,\n fetchMethod,\n noDeleteOnFetchRejection,\n noDeleteOnStaleGet,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n } = options\n\n if (max !== 0 && !isPosInt(max)) {\n throw new TypeError('max option must be a nonnegative integer')\n }\n\n const UintArray = max ? getUintArray(max) : Array\n if (!UintArray) {\n throw new Error('invalid max value: ' + max)\n }\n\n this.#max = max\n this.#maxSize = maxSize\n this.maxEntrySize = maxEntrySize || this.#maxSize\n this.sizeCalculation = sizeCalculation\n if (this.sizeCalculation) {\n if (!this.#maxSize && !this.maxEntrySize) {\n throw new TypeError(\n 'cannot set sizeCalculation without setting maxSize or maxEntrySize'\n )\n }\n if (typeof this.sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation set to non-function')\n }\n }\n\n if (\n fetchMethod !== undefined &&\n typeof fetchMethod !== 'function'\n ) {\n throw new TypeError(\n 'fetchMethod must be a function if specified'\n )\n }\n this.#fetchMethod = fetchMethod\n this.#hasFetchMethod = !!fetchMethod\n\n this.#keyMap = new Map()\n this.#keyList = new Array(max).fill(undefined)\n this.#valList = new Array(max).fill(undefined)\n this.#next = new UintArray(max)\n this.#prev = new UintArray(max)\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free = Stack.create(max)\n this.#size = 0\n this.#calculatedSize = 0\n\n if (typeof dispose === 'function') {\n this.#dispose = dispose\n }\n if (typeof disposeAfter === 'function') {\n this.#disposeAfter = disposeAfter\n this.#disposed = []\n } else {\n this.#disposeAfter = undefined\n this.#disposed = undefined\n }\n this.#hasDispose = !!this.#dispose\n this.#hasDisposeAfter = !!this.#disposeAfter\n\n this.noDisposeOnSet = !!noDisposeOnSet\n this.noUpdateTTL = !!noUpdateTTL\n this.noDeleteOnFetchRejection = !!noDeleteOnFetchRejection\n this.allowStaleOnFetchRejection = !!allowStaleOnFetchRejection\n this.allowStaleOnFetchAbort = !!allowStaleOnFetchAbort\n this.ignoreFetchAbort = !!ignoreFetchAbort\n\n // NB: maxEntrySize is set to maxSize if it's set\n if (this.maxEntrySize !== 0) {\n if (this.#maxSize !== 0) {\n if (!isPosInt(this.#maxSize)) {\n throw new TypeError(\n 'maxSize must be a positive integer if specified'\n )\n }\n }\n if (!isPosInt(this.maxEntrySize)) {\n throw new TypeError(\n 'maxEntrySize must be a positive integer if specified'\n )\n }\n this.#initializeSizeTracking()\n }\n\n this.allowStale = !!allowStale\n this.noDeleteOnStaleGet = !!noDeleteOnStaleGet\n this.updateAgeOnGet = !!updateAgeOnGet\n this.updateAgeOnHas = !!updateAgeOnHas\n this.ttlResolution =\n isPosInt(ttlResolution) || ttlResolution === 0\n ? ttlResolution\n : 1\n this.ttlAutopurge = !!ttlAutopurge\n this.ttl = ttl || 0\n if (this.ttl) {\n if (!isPosInt(this.ttl)) {\n throw new TypeError(\n 'ttl must be a positive integer if specified'\n )\n }\n this.#initializeTTLTracking()\n }\n\n // do not allow completely unbounded caches\n if (this.#max === 0 && this.ttl === 0 && this.#maxSize === 0) {\n throw new TypeError(\n 'At least one of max, maxSize, or ttl is required'\n )\n }\n if (!this.ttlAutopurge && !this.#max && !this.#maxSize) {\n const code = 'LRU_CACHE_UNBOUNDED'\n if (shouldWarn(code)) {\n warned.add(code)\n const msg =\n 'TTL caching without ttlAutopurge, max, or maxSize can ' +\n 'result in unbounded memory consumption.'\n emitWarning(msg, 'UnboundedCacheWarning', code, LRUCache)\n }\n }\n }\n\n /**\n * Return the remaining TTL time for a given entry key\n */\n getRemainingTTL(key: K) {\n return this.#keyMap.has(key) ? Infinity : 0\n }\n\n #initializeTTLTracking() {\n const ttls = new ZeroArray(this.#max)\n const starts = new ZeroArray(this.#max)\n this.#ttls = ttls\n this.#starts = starts\n\n this.#setItemTTL = (index, ttl, start = perf.now()) => {\n starts[index] = ttl !== 0 ? start : 0\n ttls[index] = ttl\n if (ttl !== 0 && this.ttlAutopurge) {\n const t = setTimeout(() => {\n if (this.#isStale(index)) {\n this.delete(this.#keyList[index] as K)\n }\n }, ttl + 1)\n // unref() not supported on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n }\n\n this.#updateItemAge = index => {\n starts[index] = ttls[index] !== 0 ? perf.now() : 0\n }\n\n this.#statusTTL = (status, index) => {\n if (ttls[index]) {\n const ttl = ttls[index]\n const start = starts[index]\n /* c8 ignore next */\n if (!ttl || !start) return\n status.ttl = ttl\n status.start = start\n status.now = cachedNow || getNow()\n const age = status.now - start\n status.remainingTTL = ttl - age\n }\n }\n\n // debounce calls to perf.now() to 1s so we're not hitting\n // that costly call repeatedly.\n let cachedNow = 0\n const getNow = () => {\n const n = perf.now()\n if (this.ttlResolution > 0) {\n cachedNow = n\n const t = setTimeout(\n () => (cachedNow = 0),\n this.ttlResolution\n )\n // not available on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n return n\n }\n\n this.getRemainingTTL = key => {\n const index = this.#keyMap.get(key)\n if (index === undefined) {\n return 0\n }\n const ttl = ttls[index]\n const start = starts[index]\n if (!ttl || !start) {\n return Infinity\n }\n const age = (cachedNow || getNow()) - start\n return ttl - age\n }\n\n this.#isStale = index => {\n const s = starts[index]\n const t = ttls[index]\n return !!t && !!s && (cachedNow || getNow()) - s > t\n }\n }\n\n // conditionally set private methods related to TTL\n #updateItemAge: (index: Index) => void = () => {}\n #statusTTL: (status: LRUCache.Status, index: Index) => void =\n () => {}\n #setItemTTL: (\n index: Index,\n ttl: LRUCache.Milliseconds,\n start?: LRUCache.Milliseconds\n // ignore because we never call this if we're not already in TTL mode\n /* c8 ignore start */\n ) => void = () => {}\n /* c8 ignore stop */\n\n #isStale: (index: Index) => boolean = () => false\n\n #initializeSizeTracking() {\n const sizes = new ZeroArray(this.#max)\n this.#calculatedSize = 0\n this.#sizes = sizes\n this.#removeItemSize = index => {\n this.#calculatedSize -= sizes[index] as number\n sizes[index] = 0\n }\n this.#requireSize = (k, v, size, sizeCalculation) => {\n // provisionally accept background fetches.\n // actual value size will be checked when they return.\n if (this.#isBackgroundFetch(v)) {\n return 0\n }\n if (!isPosInt(size)) {\n if (sizeCalculation) {\n if (typeof sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation must be a function')\n }\n size = sizeCalculation(v, k)\n if (!isPosInt(size)) {\n throw new TypeError(\n 'sizeCalculation return invalid (expect positive integer)'\n )\n }\n } else {\n throw new TypeError(\n 'invalid size value (must be positive integer). ' +\n 'When maxSize or maxEntrySize is used, sizeCalculation ' +\n 'or size must be set.'\n )\n }\n }\n return size\n }\n this.#addItemSize = (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => {\n sizes[index] = size\n if (this.#maxSize) {\n const maxSize = this.#maxSize - (sizes[index] as number)\n while (this.#calculatedSize > maxSize) {\n this.#evict(true)\n }\n }\n this.#calculatedSize += sizes[index] as number\n if (status) {\n status.entrySize = size\n status.totalCalculatedSize = this.#calculatedSize\n }\n }\n }\n\n #removeItemSize: (index: Index) => void = _i => {}\n #addItemSize: (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => void = (_i, _s, _st) => {}\n #requireSize: (\n k: K,\n v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => LRUCache.Size = (\n _k: K,\n _v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => {\n if (size || sizeCalculation) {\n throw new TypeError(\n 'cannot set size without setting maxSize or maxEntrySize on cache'\n )\n }\n return 0\n };\n\n *#indexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#tail; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#head) {\n break\n } else {\n i = this.#prev[i] as Index\n }\n }\n }\n }\n\n *#rindexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#head; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#tail) {\n break\n } else {\n i = this.#next[i] as Index\n }\n }\n }\n }\n\n #isValidIndex(index: Index) {\n return (\n index !== undefined &&\n this.#keyMap.get(this.#keyList[index] as K) === index\n )\n }\n\n /**\n * Return a generator yielding `[key, value]` pairs,\n * in order from most recently used to least recently used.\n */\n *entries() {\n for (const i of this.#indexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]] as [K, V]\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.entries}\n *\n * Return a generator yielding `[key, value]` pairs,\n * in order from least recently used to most recently used.\n */\n *rentries() {\n for (const i of this.#rindexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]]\n }\n }\n }\n\n /**\n * Return a generator yielding the keys in the cache,\n * in order from most recently used to least recently used.\n */\n *keys() {\n for (const i of this.#indexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.keys}\n *\n * Return a generator yielding the keys in the cache,\n * in order from least recently used to most recently used.\n */\n *rkeys() {\n for (const i of this.#rindexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Return a generator yielding the values in the cache,\n * in order from most recently used to least recently used.\n */\n *values() {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i] as V\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.values}\n *\n * Return a generator yielding the values in the cache,\n * in order from least recently used to most recently used.\n */\n *rvalues() {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i]\n }\n }\n }\n\n /**\n * Iterating over the cache itself yields the same results as\n * {@link LRUCache.entries}\n */\n [Symbol.iterator]() {\n return this.entries()\n }\n\n /**\n * A String value that is used in the creation of the default string description of an object.\n * Called by the built-in method Object.prototype.toString.\n */\n [Symbol.toStringTag] = 'LRUCache'\n\n /**\n * Find a value for which the supplied fn method returns a truthy value,\n * similar to Array.find(). fn is called as fn(value, key, cache).\n */\n find(\n fn: (v: V, k: K, self: LRUCache) => boolean,\n getOptions: LRUCache.GetOptions = {}\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n if (fn(value, this.#keyList[i] as K, this)) {\n return this.get(this.#keyList[i] as K, getOptions)\n }\n }\n }\n\n /**\n * Call the supplied function on each item in the cache, in order from\n * most recently used to least recently used. fn is called as\n * fn(value, key, cache). Does not update age or recenty of use.\n * Does not iterate over stale values.\n */\n forEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * The same as {@link LRUCache.forEach} but items are iterated over in\n * reverse order. (ie, less recently used items are iterated over first.)\n */\n rforEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * Delete any stale entries. Returns true if anything was removed,\n * false otherwise.\n */\n purgeStale() {\n let deleted = false\n for (const i of this.#rindexes({ allowStale: true })) {\n if (this.#isStale(i)) {\n this.delete(this.#keyList[i] as K)\n deleted = true\n }\n }\n return deleted\n }\n\n /**\n * Get the extended info about a given entry, to get its value, size, and\n * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a\n * single key. Always returns stale values, if their info is found in the\n * cache, so be sure to check for expired TTLs if relevant.\n */\n info(key: K): LRUCache.Entry | undefined {\n const i = this.#keyMap.get(key)\n if (i === undefined) return undefined\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) return undefined\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n const ttl = this.#ttls[i]\n const start = this.#starts[i]\n if (ttl && start) {\n const remain = ttl - (perf.now() - start)\n entry.ttl = remain\n entry.start = Date.now()\n }\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n return entry\n }\n\n /**\n * Return an array of [key, {@link LRUCache.Entry}] tuples which can be\n * passed to cache.load()\n */\n dump() {\n const arr: [K, LRUCache.Entry][] = []\n for (const i of this.#indexes({ allowStale: true })) {\n const key = this.#keyList[i]\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined || key === undefined) continue\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n entry.ttl = this.#ttls[i]\n // always dump the start relative to a portable timestamp\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = perf.now() - (this.#starts[i] as number)\n entry.start = Math.floor(Date.now() - age)\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n arr.unshift([key, entry])\n }\n return arr\n }\n\n /**\n * Reset the cache and load in the items in entries in the order listed.\n * Note that the shape of the resulting cache may be different if the\n * same options are not used in both caches.\n */\n load(arr: [K, LRUCache.Entry][]) {\n this.clear()\n for (const [key, entry] of arr) {\n if (entry.start) {\n // entry.start is a portable timestamp, but we may be using\n // node's performance.now(), so calculate the offset, so that\n // we get the intended remaining TTL, no matter how long it's\n // been on ice.\n //\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = Date.now() - entry.start\n entry.start = perf.now() - age\n }\n this.set(key, entry.value, entry)\n }\n }\n\n /**\n * Add a value to the cache.\n *\n * Note: if `undefined` is specified as a value, this is an alias for\n * {@link LRUCache#delete}\n */\n set(\n k: K,\n v: V | BackgroundFetch | undefined,\n setOptions: LRUCache.SetOptions = {}\n ) {\n if (v === undefined) {\n this.delete(k)\n return this\n }\n const {\n ttl = this.ttl,\n start,\n noDisposeOnSet = this.noDisposeOnSet,\n sizeCalculation = this.sizeCalculation,\n status,\n } = setOptions\n let { noUpdateTTL = this.noUpdateTTL } = setOptions\n\n const size = this.#requireSize(\n k,\n v,\n setOptions.size || 0,\n sizeCalculation\n )\n // if the item doesn't fit, don't do anything\n // NB: maxEntrySize set to maxSize by default\n if (this.maxEntrySize && size > this.maxEntrySize) {\n if (status) {\n status.set = 'miss'\n status.maxEntrySizeExceeded = true\n }\n // have to delete, in case something is there already.\n this.delete(k)\n return this\n }\n let index = this.#size === 0 ? undefined : this.#keyMap.get(k)\n if (index === undefined) {\n // addition\n index = (\n this.#size === 0\n ? this.#tail\n : this.#free.length !== 0\n ? this.#free.pop()\n : this.#size === this.#max\n ? this.#evict(false)\n : this.#size\n ) as Index\n this.#keyList[index] = k\n this.#valList[index] = v\n this.#keyMap.set(k, index)\n this.#next[this.#tail] = index\n this.#prev[index] = this.#tail\n this.#tail = index\n this.#size++\n this.#addItemSize(index, size, status)\n if (status) status.set = 'add'\n noUpdateTTL = false\n } else {\n // update\n this.#moveToTail(index)\n const oldVal = this.#valList[index] as V | BackgroundFetch\n if (v !== oldVal) {\n if (this.#hasFetchMethod && this.#isBackgroundFetch(oldVal)) {\n oldVal.__abortController.abort(new Error('replaced'))\n const { __staleWhileFetching: s } = oldVal\n if (s !== undefined && !noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(s as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([s as V, k, 'set'])\n }\n }\n } else if (!noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(oldVal as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([oldVal as V, k, 'set'])\n }\n }\n this.#removeItemSize(index)\n this.#addItemSize(index, size, status)\n this.#valList[index] = v\n if (status) {\n status.set = 'replace'\n const oldValue =\n oldVal && this.#isBackgroundFetch(oldVal)\n ? oldVal.__staleWhileFetching\n : oldVal\n if (oldValue !== undefined) status.oldValue = oldValue\n }\n } else if (status) {\n status.set = 'update'\n }\n }\n if (ttl !== 0 && !this.#ttls) {\n this.#initializeTTLTracking()\n }\n if (this.#ttls) {\n if (!noUpdateTTL) {\n this.#setItemTTL(index, ttl, start)\n }\n if (status) this.#statusTTL(status, index)\n }\n if (!noDisposeOnSet && this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return this\n }\n\n /**\n * Evict the least recently used item, returning its value or\n * `undefined` if cache is empty.\n */\n pop(): V | undefined {\n try {\n while (this.#size) {\n const val = this.#valList[this.#head]\n this.#evict(true)\n if (this.#isBackgroundFetch(val)) {\n if (val.__staleWhileFetching) {\n return val.__staleWhileFetching\n }\n } else if (val !== undefined) {\n return val\n }\n }\n } finally {\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n }\n\n #evict(free: boolean) {\n const head = this.#head\n const k = this.#keyList[head] as K\n const v = this.#valList[head] as V\n if (this.#hasFetchMethod && this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('evicted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v, k, 'evict')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v, k, 'evict'])\n }\n }\n this.#removeItemSize(head)\n // if we aren't about to use the index, then null these out\n if (free) {\n this.#keyList[head] = undefined\n this.#valList[head] = undefined\n this.#free.push(head)\n }\n if (this.#size === 1) {\n this.#head = this.#tail = 0 as Index\n this.#free.length = 0\n } else {\n this.#head = this.#next[head] as Index\n }\n this.#keyMap.delete(k)\n this.#size--\n return head\n }\n\n /**\n * Check if a key is in the cache, without updating the recency of use.\n * Will return false if the item is stale, even though it is technically\n * in the cache.\n *\n * Will not update item age unless\n * {@link LRUCache.OptionsBase.updateAgeOnHas} is set.\n */\n has(k: K, hasOptions: LRUCache.HasOptions = {}) {\n const { updateAgeOnHas = this.updateAgeOnHas, status } =\n hasOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const v = this.#valList[index]\n if (\n this.#isBackgroundFetch(v) &&\n v.__staleWhileFetching === undefined\n ) {\n return false\n }\n if (!this.#isStale(index)) {\n if (updateAgeOnHas) {\n this.#updateItemAge(index)\n }\n if (status) {\n status.has = 'hit'\n this.#statusTTL(status, index)\n }\n return true\n } else if (status) {\n status.has = 'stale'\n this.#statusTTL(status, index)\n }\n } else if (status) {\n status.has = 'miss'\n }\n return false\n }\n\n /**\n * Like {@link LRUCache#get} but doesn't update recency or delete stale\n * items.\n *\n * Returns `undefined` if the item is stale, unless\n * {@link LRUCache.OptionsBase.allowStale} is set.\n */\n peek(k: K, peekOptions: LRUCache.PeekOptions = {}) {\n const { allowStale = this.allowStale } = peekOptions\n const index = this.#keyMap.get(k)\n if (\n index === undefined ||\n (!allowStale && this.#isStale(index))\n ) {\n return\n }\n const v = this.#valList[index]\n // either stale and allowed, or forcing a refresh of non-stale value\n return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v\n }\n\n #backgroundFetch(\n k: K,\n index: Index | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch {\n const v = index === undefined ? undefined : this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n return v\n }\n\n const ac = new AC()\n const { signal } = options\n // when/if our AC signals, then stop listening to theirs.\n signal?.addEventListener('abort', () => ac.abort(signal.reason), {\n signal: ac.signal,\n })\n\n const fetchOpts = {\n signal: ac.signal,\n options,\n context,\n }\n\n const cb = (\n v: V | undefined,\n updateCache = false\n ): V | undefined => {\n const { aborted } = ac.signal\n const ignoreAbort = options.ignoreFetchAbort && v !== undefined\n if (options.status) {\n if (aborted && !updateCache) {\n options.status.fetchAborted = true\n options.status.fetchError = ac.signal.reason\n if (ignoreAbort) options.status.fetchAbortIgnored = true\n } else {\n options.status.fetchResolved = true\n }\n }\n if (aborted && !ignoreAbort && !updateCache) {\n return fetchFail(ac.signal.reason)\n }\n // either we didn't abort, and are still here, or we did, and ignored\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n if (v === undefined) {\n if (bf.__staleWhileFetching) {\n this.#valList[index as Index] = bf.__staleWhileFetching\n } else {\n this.delete(k)\n }\n } else {\n if (options.status) options.status.fetchUpdated = true\n this.set(k, v, fetchOpts.options)\n }\n }\n return v\n }\n\n const eb = (er: any) => {\n if (options.status) {\n options.status.fetchRejected = true\n options.status.fetchError = er\n }\n return fetchFail(er)\n }\n\n const fetchFail = (er: any): V | undefined => {\n const { aborted } = ac.signal\n const allowStaleAborted =\n aborted && options.allowStaleOnFetchAbort\n const allowStale =\n allowStaleAborted || options.allowStaleOnFetchRejection\n const noDelete = allowStale || options.noDeleteOnFetchRejection\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n // if we allow stale on fetch rejections, then we need to ensure that\n // the stale value is not removed from the cache when the fetch fails.\n const del = !noDelete || bf.__staleWhileFetching === undefined\n if (del) {\n this.delete(k)\n } else if (!allowStaleAborted) {\n // still replace the *promise* with the stale value,\n // since we are done with the promise at this point.\n // leave it untouched if we're still waiting for an\n // aborted background fetch that hasn't yet returned.\n this.#valList[index as Index] = bf.__staleWhileFetching\n }\n }\n if (allowStale) {\n if (options.status && bf.__staleWhileFetching !== undefined) {\n options.status.returnedStale = true\n }\n return bf.__staleWhileFetching\n } else if (bf.__returned === bf) {\n throw er\n }\n }\n\n const pcall = (\n res: (v: V | undefined) => void,\n rej: (e: any) => void\n ) => {\n const fmp = this.#fetchMethod?.(k, v, fetchOpts)\n if (fmp && fmp instanceof Promise) {\n fmp.then(v => res(v === undefined ? undefined : v), rej)\n }\n // ignored, we go until we finish, regardless.\n // defer check until we are actually aborting,\n // so fetchMethod can override.\n ac.signal.addEventListener('abort', () => {\n if (\n !options.ignoreFetchAbort ||\n options.allowStaleOnFetchAbort\n ) {\n res(undefined)\n // when it eventually resolves, update the cache.\n if (options.allowStaleOnFetchAbort) {\n res = v => cb(v, true)\n }\n }\n })\n }\n\n if (options.status) options.status.fetchDispatched = true\n const p = new Promise(pcall).then(cb, eb)\n const bf: BackgroundFetch = Object.assign(p, {\n __abortController: ac,\n __staleWhileFetching: v,\n __returned: undefined,\n })\n\n if (index === undefined) {\n // internal, don't expose status.\n this.set(k, bf, { ...fetchOpts.options, status: undefined })\n index = this.#keyMap.get(k)\n } else {\n this.#valList[index] = bf\n }\n return bf\n }\n\n #isBackgroundFetch(p: any): p is BackgroundFetch {\n if (!this.#hasFetchMethod) return false\n const b = p as BackgroundFetch\n return (\n !!b &&\n b instanceof Promise &&\n b.hasOwnProperty('__staleWhileFetching') &&\n b.__abortController instanceof AC\n )\n }\n\n /**\n * Make an asynchronous cached fetch using the\n * {@link LRUCache.OptionsBase.fetchMethod} function.\n *\n * If multiple fetches for the same key are issued, then they will all be\n * coalesced into a single call to fetchMethod.\n *\n * Note that this means that handling options such as\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort},\n * {@link LRUCache.FetchOptions.signal},\n * and {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} will be\n * determined by the FIRST fetch() call for a given key.\n *\n * This is a known (fixable) shortcoming which will be addresed on when\n * someone complains about it, as the fix would involve added complexity and\n * may not be worth the costs for this edge case.\n */\n fetch(\n k: K,\n fetchOptions: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : LRUCache.FetchOptionsWithContext\n ): Promise\n // this overload not allowed if context is required\n fetch(\n k: unknown extends FC\n ? K\n : FC extends undefined | void\n ? K\n : never,\n fetchOptions?: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : never\n ): Promise\n async fetch(\n k: K,\n fetchOptions: LRUCache.FetchOptions = {}\n ): Promise {\n const {\n // get options\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n // set options\n ttl = this.ttl,\n noDisposeOnSet = this.noDisposeOnSet,\n size = 0,\n sizeCalculation = this.sizeCalculation,\n noUpdateTTL = this.noUpdateTTL,\n // fetch exclusive options\n noDeleteOnFetchRejection = this.noDeleteOnFetchRejection,\n allowStaleOnFetchRejection = this.allowStaleOnFetchRejection,\n ignoreFetchAbort = this.ignoreFetchAbort,\n allowStaleOnFetchAbort = this.allowStaleOnFetchAbort,\n context,\n forceRefresh = false,\n status,\n signal,\n } = fetchOptions\n\n if (!this.#hasFetchMethod) {\n if (status) status.fetch = 'get'\n return this.get(k, {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n status,\n })\n }\n\n const options = {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n ttl,\n noDisposeOnSet,\n size,\n sizeCalculation,\n noUpdateTTL,\n noDeleteOnFetchRejection,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n status,\n signal,\n }\n\n let index = this.#keyMap.get(k)\n if (index === undefined) {\n if (status) status.fetch = 'miss'\n const p = this.#backgroundFetch(k, index, options, context)\n return (p.__returned = p)\n } else {\n // in cache, maybe already fetching\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n const stale =\n allowStale && v.__staleWhileFetching !== undefined\n if (status) {\n status.fetch = 'inflight'\n if (stale) status.returnedStale = true\n }\n return stale ? v.__staleWhileFetching : (v.__returned = v)\n }\n\n // if we force a refresh, that means do NOT serve the cached value,\n // unless we are already in the process of refreshing the cache.\n const isStale = this.#isStale(index)\n if (!forceRefresh && !isStale) {\n if (status) status.fetch = 'hit'\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n if (status) this.#statusTTL(status, index)\n return v\n }\n\n // ok, it is stale or a forced refresh, and not already fetching.\n // refresh the cache.\n const p = this.#backgroundFetch(k, index, options, context)\n const hasStale = p.__staleWhileFetching !== undefined\n const staleVal = hasStale && allowStale\n if (status) {\n status.fetch = isStale ? 'stale' : 'refresh'\n if (staleVal && isStale) status.returnedStale = true\n }\n return staleVal ? p.__staleWhileFetching : (p.__returned = p)\n }\n }\n\n /**\n * Return a value from the cache. Will update the recency of the cache\n * entry found.\n *\n * If the key is not found, get() will return `undefined`.\n */\n get(k: K, getOptions: LRUCache.GetOptions = {}) {\n const {\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n status,\n } = getOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const value = this.#valList[index]\n const fetching = this.#isBackgroundFetch(value)\n if (status) this.#statusTTL(status, index)\n if (this.#isStale(index)) {\n if (status) status.get = 'stale'\n // delete only if not an in-flight background fetch\n if (!fetching) {\n if (!noDeleteOnStaleGet) {\n this.delete(k)\n }\n if (status && allowStale) status.returnedStale = true\n return allowStale ? value : undefined\n } else {\n if (\n status &&\n allowStale &&\n value.__staleWhileFetching !== undefined\n ) {\n status.returnedStale = true\n }\n return allowStale ? value.__staleWhileFetching : undefined\n }\n } else {\n if (status) status.get = 'hit'\n // if we're currently fetching it, we don't actually have it yet\n // it's not stale, which means this isn't a staleWhileRefetching.\n // If it's not stale, and fetching, AND has a __staleWhileFetching\n // value, then that means the user fetched with {forceRefresh:true},\n // so it's safe to return that value.\n if (fetching) {\n return value.__staleWhileFetching\n }\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n return value\n }\n } else if (status) {\n status.get = 'miss'\n }\n }\n\n #connect(p: Index, n: Index) {\n this.#prev[n] = p\n this.#next[p] = n\n }\n\n #moveToTail(index: Index): void {\n // if tail already, nothing to do\n // if head, move head to next[index]\n // else\n // move next[prev[index]] to next[index] (head has no prev)\n // move prev[next[index]] to prev[index]\n // prev[index] = tail\n // next[tail] = index\n // tail = index\n if (index !== this.#tail) {\n if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n this.#connect(\n this.#prev[index] as Index,\n this.#next[index] as Index\n )\n }\n this.#connect(this.#tail, index)\n this.#tail = index\n }\n }\n\n /**\n * Deletes a key out of the cache.\n * Returns true if the key was deleted, false otherwise.\n */\n delete(k: K) {\n let deleted = false\n if (this.#size !== 0) {\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n deleted = true\n if (this.#size === 1) {\n this.clear()\n } else {\n this.#removeItemSize(index)\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k, 'delete'])\n }\n }\n this.#keyMap.delete(k)\n this.#keyList[index] = undefined\n this.#valList[index] = undefined\n if (index === this.#tail) {\n this.#tail = this.#prev[index] as Index\n } else if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n const pi = this.#prev[index] as number\n this.#next[pi] = this.#next[index] as number\n const ni = this.#next[index] as number\n this.#prev[ni] = this.#prev[index] as number\n }\n this.#size--\n this.#free.push(index)\n }\n }\n }\n if (this.#hasDisposeAfter && this.#disposed?.length) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return deleted\n }\n\n /**\n * Clear the cache entirely, throwing away all values.\n */\n clear() {\n for (const index of this.#rindexes({ allowStale: true })) {\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else {\n const k = this.#keyList[index]\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k as K, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k as K, 'delete'])\n }\n }\n }\n\n this.#keyMap.clear()\n this.#valList.fill(undefined)\n this.#keyList.fill(undefined)\n if (this.#ttls && this.#starts) {\n this.#ttls.fill(0)\n this.#starts.fill(0)\n }\n if (this.#sizes) {\n this.#sizes.fill(0)\n }\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free.length = 0\n this.#calculatedSize = 0\n this.#size = 0\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n}\n\nexport default LRUCache\n"]} \ No newline at end of file diff --git a/dist/esm/index.min.js b/dist/esm/index.min.js new file mode 100644 index 0000000..002a62a --- /dev/null +++ b/dist/esm/index.min.js @@ -0,0 +1,2 @@ +var G=(o,t,e)=>{if(!t.has(o))throw TypeError("Cannot "+e)};var I=(o,t,e)=>(G(o,t,"read from private field"),e?e.call(o):t.get(o)),j=(o,t,e)=>{if(t.has(o))throw TypeError("Cannot add the same private member more than once");t instanceof WeakSet?t.add(o):t.set(o,e)},D=(o,t,e,i)=>(G(o,t,"write to private field"),i?i.call(o,e):t.set(o,e),e);var O=typeof performance=="object"&&performance&&typeof performance.now=="function"?performance:Date,M=new Set,L=typeof process=="object"&&process?process:{},P=(o,t,e,i)=>{typeof L.emitWarning=="function"?L.emitWarning(o,t,e,i):console.error(`[${e}] ${t}: ${o}`)},R=globalThis.AbortController,N=globalThis.AbortSignal;if(typeof R>"u"){N=class{onabort;_onabort=[];reason;aborted=!1;addEventListener(i,s){this._onabort.push(s)}},R=class{constructor(){t()}signal=new N;abort(i){if(!this.signal.aborted){this.signal.reason=i,this.signal.aborted=!0;for(let s of this.signal._onabort)s(i);this.signal.onabort?.(i)}}};let o=L.env?.LRU_CACHE_IGNORE_AC_WARNING!=="1",t=()=>{o&&(o=!1,P("AbortController is not defined. 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C=class{#g;#f;#p;#w;#C;ttl;ttlResolution;ttlAutopurge;updateAgeOnGet;updateAgeOnHas;allowStale;noDisposeOnSet;noUpdateTTL;maxEntrySize;sizeCalculation;noDeleteOnFetchRejection;noDeleteOnStaleGet;allowStaleOnFetchAbort;allowStaleOnFetchRejection;ignoreFetchAbort;#n;#S;#s;#i;#t;#l;#c;#o;#h;#_;#r;#b;#y;#u;#m;#O;#a;static unsafeExposeInternals(t){return{starts:t.#y,ttls:t.#u,sizes:t.#b,keyMap:t.#s,keyList:t.#i,valList:t.#t,next:t.#l,prev:t.#c,get head(){return t.#o},get tail(){return t.#h},free:t.#_,isBackgroundFetch:e=>t.#e(e),backgroundFetch:(e,i,s,n)=>t.#D(e,i,s,n),moveToTail:e=>t.#v(e),indexes:e=>t.#A(e),rindexes:e=>t.#F(e),isStale:e=>t.#d(e)}}get max(){return this.#g}get maxSize(){return this.#f}get calculatedSize(){return this.#S}get size(){return this.#n}get fetchMethod(){return this.#C}get dispose(){return this.#p}get disposeAfter(){return 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0?(this.set(t,F,{...r.options,status:void 0}),e=this.#s.get(t)):this.#t[e]=F,F}#e(t){if(!this.#O)return!1;let e=t;return!!e&&e instanceof Promise&&e.hasOwnProperty("__staleWhileFetching")&&e.__abortController instanceof R}async fetch(t,e={}){let{allowStale:i=this.allowStale,updateAgeOnGet:s=this.updateAgeOnGet,noDeleteOnStaleGet:n=this.noDeleteOnStaleGet,ttl:h=this.ttl,noDisposeOnSet:l=this.noDisposeOnSet,size:r=0,sizeCalculation:g=this.sizeCalculation,noUpdateTTL:b=this.noUpdateTTL,noDeleteOnFetchRejection:f=this.noDeleteOnFetchRejection,allowStaleOnFetchRejection:u=this.allowStaleOnFetchRejection,ignoreFetchAbort:c=this.ignoreFetchAbort,allowStaleOnFetchAbort:F=this.allowStaleOnFetchAbort,context:d,forceRefresh:S=!1,status:a,signal:w}=e;if(!this.#O)return a&&(a.fetch="get"),this.get(t,{allowStale:i,updateAgeOnGet:s,noDeleteOnStaleGet:n,status:a});let y={allowStale:i,updateAgeOnGet:s,noDeleteOnStaleGet:n,ttl:h,noDisposeOnSet:l,size:r,sizeCalculation:g,noUpdateTTL:b,noDeleteOnFetchRejection:f,allowStaleOnFetchRejection:u,allowStaleOnFetchAbort:F,ignoreFetchAbort:c,status:a,signal:w},p=this.#s.get(t);if(p===void 0){a&&(a.fetch="miss");let _=this.#D(t,p,y,d);return _.__returned=_}else{let _=this.#t[p];if(this.#e(_)){let U=i&&_.__staleWhileFetching!==void 0;return a&&(a.fetch="inflight",U&&(a.returnedStale=!0)),U?_.__staleWhileFetching:_.__returned=_}let T=this.#d(p);if(!S&&!T)return a&&(a.fetch="hit"),this.#v(p),s&&this.#z(p),a&&this.#T(a,p),_;let m=this.#D(t,p,y,d),x=m.__staleWhileFetching!==void 0&&i;return a&&(a.fetch=T?"stale":"refresh",x&&T&&(a.returnedStale=!0)),x?m.__staleWhileFetching:m.__returned=m}}get(t,e={}){let{allowStale:i=this.allowStale,updateAgeOnGet:s=this.updateAgeOnGet,noDeleteOnStaleGet:n=this.noDeleteOnStaleGet,status:h}=e,l=this.#s.get(t);if(l!==void 0){let r=this.#t[l],g=this.#e(r);return h&&this.#T(h,l),this.#d(l)?(h&&(h.get="stale"),g?(h&&i&&r.__staleWhileFetching!==void 0&&(h.returnedStale=!0),i?r.__staleWhileFetching:void 0):(n||this.delete(t),h&&i&&(h.returnedStale=!0),i?r:void 0)):(h&&(h.get="hit"),g?r.__staleWhileFetching:(this.#v(l),s&&this.#z(l),r))}else h&&(h.get="miss")}#I(t,e){this.#c[e]=t,this.#l[t]=e}#v(t){t!==this.#h&&(t===this.#o?this.#o=this.#l[t]:this.#I(this.#c[t],this.#l[t]),this.#I(this.#h,t),this.#h=t)}delete(t){let e=!1;if(this.#n!==0){let i=this.#s.get(t);if(i!==void 0)if(e=!0,this.#n===1)this.clear();else{this.#E(i);let s=this.#t[i];if(this.#e(s)?s.__abortController.abort(new Error("deleted")):(this.#m||this.#a)&&(this.#m&&this.#p?.(s,t,"delete"),this.#a&&this.#r?.push([s,t,"delete"])),this.#s.delete(t),this.#i[i]=void 0,this.#t[i]=void 0,i===this.#h)this.#h=this.#c[i];else if(i===this.#o)this.#o=this.#l[i];else{let n=this.#c[i];this.#l[n]=this.#l[i];let h=this.#l[i];this.#c[h]=this.#c[i]}this.#n--,this.#_.push(i)}}if(this.#a&&this.#r?.length){let i=this.#r,s;for(;s=i?.shift();)this.#w?.(...s)}return e}clear(){for(let t of this.#F({allowStale:!0})){let e=this.#t[t];if(this.#e(e))e.__abortController.abort(new Error("deleted"));else{let i=this.#i[t];this.#m&&this.#p?.(e,i,"delete"),this.#a&&this.#r?.push([e,i,"delete"])}}if(this.#s.clear(),this.#t.fill(void 0),this.#i.fill(void 0),this.#u&&this.#y&&(this.#u.fill(0),this.#y.fill(0)),this.#b&&this.#b.fill(0),this.#o=0,this.#h=0,this.#_.length=0,this.#S=0,this.#n=0,this.#a&&this.#r){let t=this.#r,e;for(;e=t?.shift();)this.#w?.(...e)}}},X=C;export{C as LRUCache,X as default}; +//# sourceMappingURL=index.min.js.map diff --git a/dist/esm/index.min.js.map b/dist/esm/index.min.js.map new file mode 100644 index 0000000..8d4aecd --- /dev/null +++ b/dist/esm/index.min.js.map @@ -0,0 +1,7 @@ +{ + "version": 3, + "sources": ["../../src/index.ts"], + "sourcesContent": ["/**\n * @module LRUCache\n */\n\n// module-private names and types\ntype Perf = { now: () => number }\nconst perf: Perf =\n typeof performance === 'object' &&\n performance &&\n typeof performance.now === 'function'\n ? performance\n : Date\n\nconst warned = new Set()\n\n// either a function or a class\ntype ForC = ((...a: any[]) => any) | { new (...a: any[]): any }\n\n/* c8 ignore start */\nconst PROCESS = (\n typeof process === 'object' && !!process ? process : {}\n) as { [k: string]: any }\n/* c8 ignore start */\n\nconst emitWarning = (\n msg: string,\n type: string,\n code: string,\n fn: ForC\n) => {\n typeof PROCESS.emitWarning === 'function'\n ? PROCESS.emitWarning(msg, type, code, fn)\n : console.error(`[${code}] ${type}: ${msg}`)\n}\n\nlet AC = globalThis.AbortController\nlet AS = globalThis.AbortSignal\n\n/* c8 ignore start */\nif (typeof AC === 'undefined') {\n //@ts-ignore\n AS = class AbortSignal {\n onabort?: (...a: any[]) => any\n _onabort: ((...a: any[]) => any)[] = []\n reason?: any\n aborted: boolean = false\n addEventListener(_: string, fn: (...a: any[]) => any) {\n this._onabort.push(fn)\n }\n }\n //@ts-ignore\n AC = class AbortController {\n constructor() {\n warnACPolyfill()\n }\n signal = new AS()\n abort(reason: any) {\n if (this.signal.aborted) return\n //@ts-ignore\n this.signal.reason = reason\n //@ts-ignore\n this.signal.aborted = true\n //@ts-ignore\n for (const fn of this.signal._onabort) {\n fn(reason)\n }\n this.signal.onabort?.(reason)\n }\n }\n let printACPolyfillWarning =\n PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'\n const warnACPolyfill = () => {\n if (!printACPolyfillWarning) return\n printACPolyfillWarning = false\n emitWarning(\n 'AbortController is not defined. If using lru-cache in ' +\n 'node 14, load an AbortController polyfill from the ' +\n '`node-abort-controller` package. A minimal polyfill is ' +\n 'provided for use by LRUCache.fetch(), but it should not be ' +\n 'relied upon in other contexts (eg, passing it to other APIs that ' +\n 'use AbortController/AbortSignal might have undesirable effects). ' +\n 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.',\n 'NO_ABORT_CONTROLLER',\n 'ENOTSUP',\n warnACPolyfill\n )\n }\n}\n/* c8 ignore stop */\n\nconst shouldWarn = (code: string) => !warned.has(code)\n\nconst TYPE = Symbol('type')\nexport type PosInt = number & { [TYPE]: 'Positive Integer' }\nexport type Index = number & { [TYPE]: 'LRUCache Index' }\n\nconst isPosInt = (n: any): n is PosInt =>\n n && n === Math.floor(n) && n > 0 && isFinite(n)\n\nexport type UintArray = Uint8Array | Uint16Array | Uint32Array\nexport type NumberArray = UintArray | number[]\n\n/* c8 ignore start */\n// This is a little bit ridiculous, tbh.\n// The maximum array length is 2^32-1 or thereabouts on most JS impls.\n// And well before that point, you're caching the entire world, I mean,\n// that's ~32GB of just integers for the next/prev links, plus whatever\n// else to hold that many keys and values. Just filling the memory with\n// zeroes at init time is brutal when you get that big.\n// But why not be complete?\n// Maybe in the future, these limits will have expanded.\nconst getUintArray = (max: number) =>\n !isPosInt(max)\n ? null\n : max <= Math.pow(2, 8)\n ? Uint8Array\n : max <= Math.pow(2, 16)\n ? Uint16Array\n : max <= Math.pow(2, 32)\n ? Uint32Array\n : max <= Number.MAX_SAFE_INTEGER\n ? ZeroArray\n : null\n/* c8 ignore stop */\n\nclass ZeroArray extends Array {\n constructor(size: number) {\n super(size)\n this.fill(0)\n }\n}\nexport type { ZeroArray }\nexport type { Stack }\n\nexport type StackLike = Stack | Index[]\nclass Stack {\n heap: NumberArray\n length: number\n // private constructor\n static #constructing: boolean = false\n static create(max: number): StackLike {\n const HeapCls = getUintArray(max)\n if (!HeapCls) return []\n Stack.#constructing = true\n const s = new Stack(max, HeapCls)\n Stack.#constructing = false\n return s\n }\n constructor(\n max: number,\n HeapCls: { new (n: number): NumberArray }\n ) {\n /* c8 ignore start */\n if (!Stack.#constructing) {\n throw new TypeError('instantiate Stack using Stack.create(n)')\n }\n /* c8 ignore stop */\n this.heap = new HeapCls(max)\n this.length = 0\n }\n push(n: Index) {\n this.heap[this.length++] = n\n }\n pop(): Index {\n return this.heap[--this.length] as Index\n }\n}\n\n/**\n * Promise representing an in-progress {@link LRUCache#fetch} call\n */\nexport type BackgroundFetch = Promise & {\n __returned: BackgroundFetch | undefined\n __abortController: AbortController\n __staleWhileFetching: V | undefined\n}\n\nexport type DisposeTask = [\n value: V,\n key: K,\n reason: LRUCache.DisposeReason\n]\n\nexport namespace LRUCache {\n /**\n * An integer greater than 0, reflecting the calculated size of items\n */\n export type Size = number\n\n /**\n * Integer greater than 0, representing some number of milliseconds, or the\n * time at which a TTL started counting from.\n */\n export type Milliseconds = number\n\n /**\n * An integer greater than 0, reflecting a number of items\n */\n export type Count = number\n\n /**\n * The reason why an item was removed from the cache, passed\n * to the {@link Disposer} methods.\n */\n export type DisposeReason = 'evict' | 'set' | 'delete'\n /**\n * A method called upon item removal, passed as the\n * {@link OptionsBase.dispose} and/or\n * {@link OptionsBase.disposeAfter} options.\n */\n export type Disposer = (\n value: V,\n key: K,\n reason: DisposeReason\n ) => void\n\n /**\n * A function that returns the effective calculated size\n * of an entry in the cache.\n */\n export type SizeCalculator = (value: V, key: K) => Size\n\n /**\n * Options provided to the\n * {@link OptionsBase.fetchMethod} function.\n */\n export interface FetcherOptions {\n signal: AbortSignal\n options: FetcherFetchOptions\n /**\n * Object provided in the {@link FetchOptions.context} option to\n * {@link LRUCache#fetch}\n */\n context: FC\n }\n\n /**\n * Status object that may be passed to {@link LRUCache#fetch},\n * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}.\n */\n export interface Status {\n /**\n * The status of a set() operation.\n *\n * - add: the item was not found in the cache, and was added\n * - update: the item was in the cache, with the same value provided\n * - replace: the item was in the cache, and replaced\n * - miss: the item was not added to the cache for some reason\n */\n set?: 'add' | 'update' | 'replace' | 'miss'\n\n /**\n * the ttl stored for the item, or undefined if ttls are not used.\n */\n ttl?: Milliseconds\n\n /**\n * the start time for the item, or undefined if ttls are not used.\n */\n start?: Milliseconds\n\n /**\n * The timestamp used for TTL calculation\n */\n now?: Milliseconds\n\n /**\n * the remaining ttl for the item, or undefined if ttls are not used.\n */\n remainingTTL?: Milliseconds\n\n /**\n * The calculated size for the item, if sizes are used.\n */\n entrySize?: Size\n\n /**\n * The total calculated size of the cache, if sizes are used.\n */\n totalCalculatedSize?: Size\n\n /**\n * A flag indicating that the item was not stored, due to exceeding the\n * {@link OptionsBase.maxEntrySize}\n */\n maxEntrySizeExceeded?: true\n\n /**\n * The old value, specified in the case of `set:'update'` or\n * `set:'replace'`\n */\n oldValue?: V\n\n /**\n * The results of a {@link LRUCache#has} operation\n *\n * - hit: the item was found in the cache\n * - stale: the item was found in the cache, but is stale\n * - miss: the item was not found in the cache\n */\n has?: 'hit' | 'stale' | 'miss'\n\n /**\n * The status of a {@link LRUCache#fetch} operation.\n * Note that this can change as the underlying fetch() moves through\n * various states.\n *\n * - inflight: there is another fetch() for this key which is in process\n * - get: there is no fetchMethod, so {@link LRUCache#get} was called.\n * - miss: the item is not in cache, and will be fetched.\n * - hit: the item is in the cache, and was resolved immediately.\n * - stale: the item is in the cache, but stale.\n * - refresh: the item is in the cache, and not stale, but\n * {@link FetchOptions.forceRefresh} was specified.\n */\n fetch?: 'get' | 'inflight' | 'miss' | 'hit' | 'stale' | 'refresh'\n\n /**\n * The {@link OptionsBase.fetchMethod} was called\n */\n fetchDispatched?: true\n\n /**\n * The cached value was updated after a successful call to\n * {@link OptionsBase.fetchMethod}\n */\n fetchUpdated?: true\n\n /**\n * The reason for a fetch() rejection. Either the error raised by the\n * {@link OptionsBase.fetchMethod}, or the reason for an\n * AbortSignal.\n */\n fetchError?: Error\n\n /**\n * The fetch received an abort signal\n */\n fetchAborted?: true\n\n /**\n * The abort signal received was ignored, and the fetch was allowed to\n * continue.\n */\n fetchAbortIgnored?: true\n\n /**\n * The fetchMethod promise resolved successfully\n */\n fetchResolved?: true\n\n /**\n * The fetchMethod promise was rejected\n */\n fetchRejected?: true\n\n /**\n * The status of a {@link LRUCache#get} operation.\n *\n * - fetching: The item is currently being fetched. If a previous value\n * is present and allowed, that will be returned.\n * - stale: The item is in the cache, and is stale.\n * - hit: the item is in the cache\n * - miss: the item is not in the cache\n */\n get?: 'stale' | 'hit' | 'miss'\n\n /**\n * A fetch or get operation returned a stale value.\n */\n returnedStale?: true\n }\n\n /**\n * options which override the options set in the LRUCache constructor\n * when calling {@link LRUCache#fetch}.\n *\n * This is the union of {@link GetOptions} and {@link SetOptions}, plus\n * {@link OptionsBase.noDeleteOnFetchRejection},\n * {@link OptionsBase.allowStaleOnFetchRejection},\n * {@link FetchOptions.forceRefresh}, and\n * {@link FetcherOptions.context}\n *\n * Any of these may be modified in the {@link OptionsBase.fetchMethod}\n * function, but the {@link GetOptions} fields will of course have no\n * effect, as the {@link LRUCache#get} call already happened by the time\n * the fetchMethod is called.\n */\n export interface FetcherFetchOptions\n extends Pick<\n OptionsBase,\n | 'allowStale'\n | 'updateAgeOnGet'\n | 'noDeleteOnStaleGet'\n | 'sizeCalculation'\n | 'ttl'\n | 'noDisposeOnSet'\n | 'noUpdateTTL'\n | 'noDeleteOnFetchRejection'\n | 'allowStaleOnFetchRejection'\n | 'ignoreFetchAbort'\n | 'allowStaleOnFetchAbort'\n > {\n status?: Status\n size?: Size\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#fetch} method.\n */\n export interface FetchOptions\n extends FetcherFetchOptions {\n /**\n * Set to true to force a re-load of the existing data, even if it\n * is not yet stale.\n */\n forceRefresh?: boolean\n /**\n * Context provided to the {@link OptionsBase.fetchMethod} as\n * the {@link FetcherOptions.context} param.\n *\n * If the FC type is specified as unknown (the default),\n * undefined or void, then this is optional. Otherwise, it will\n * be required.\n */\n context?: FC\n signal?: AbortSignal\n status?: Status\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is something\n * other than `unknown`, `undefined`, or `void`\n */\n export interface FetchOptionsWithContext\n extends FetchOptions {\n context: FC\n }\n /**\n * Options provided to {@link LRUCache#fetch} when the FC type is\n * `undefined` or `void`\n */\n export interface FetchOptionsNoContext\n extends FetchOptions {\n context?: undefined\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#has} method.\n */\n export interface HasOptions\n extends Pick, 'updateAgeOnHas'> {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#get} method.\n */\n export interface GetOptions\n extends Pick<\n OptionsBase,\n 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'\n > {\n status?: Status\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#peek} method.\n */\n export interface PeekOptions\n extends Pick, 'allowStale'> {}\n\n /**\n * Options that may be passed to the {@link LRUCache#set} method.\n */\n export interface SetOptions\n extends Pick<\n OptionsBase,\n 'sizeCalculation' | 'ttl' | 'noDisposeOnSet' | 'noUpdateTTL'\n > {\n /**\n * If size tracking is enabled, then setting an explicit size\n * in the {@link LRUCache#set} call will prevent calling the\n * {@link OptionsBase.sizeCalculation} function.\n */\n size?: Size\n /**\n * If TTL tracking is enabled, then setting an explicit start\n * time in the {@link LRUCache#set} call will override the\n * default time from `performance.now()` or `Date.now()`.\n *\n * Note that it must be a valid value for whichever time-tracking\n * method is in use.\n */\n start?: Milliseconds\n status?: Status\n }\n\n /**\n * The type signature for the {@link OptionsBase.fetchMethod} option.\n */\n export type Fetcher = (\n key: K,\n staleValue: V | undefined,\n options: FetcherOptions\n ) => Promise | V | undefined | void\n\n /**\n * Options which may be passed to the {@link LRUCache} constructor.\n *\n * Most of these may be overridden in the various options that use\n * them.\n *\n * Despite all being technically optional, the constructor requires that\n * a cache is at minimum limited by one or more of {@link OptionsBase.max},\n * {@link OptionsBase.ttl}, or {@link OptionsBase.maxSize}.\n *\n * If {@link OptionsBase.ttl} is used alone, then it is strongly advised\n * (and in fact required by the type definitions here) that the cache\n * also set {@link OptionsBase.ttlAutopurge}, to prevent potentially\n * unbounded storage.\n */\n export interface OptionsBase {\n /**\n * The maximum number of items to store in the cache before evicting\n * old entries. This is read-only on the {@link LRUCache} instance,\n * and may not be overridden.\n *\n * If set, then storage space will be pre-allocated at construction\n * time, and the cache will perform significantly faster.\n *\n * Note that significantly fewer items may be stored, if\n * {@link OptionsBase.maxSize} and/or {@link OptionsBase.ttl} are also\n * set.\n */\n max?: Count\n\n /**\n * Max time in milliseconds for items to live in cache before they are\n * considered stale. Note that stale items are NOT preemptively removed\n * by default, and MAY live in the cache long after they have expired.\n *\n * Also, as this cache is optimized for LRU/MRU operations, some of\n * the staleness/TTL checks will reduce performance, as they will incur\n * overhead by deleting items.\n *\n * Must be an integer number of ms. If set to 0, this indicates \"no TTL\"\n *\n * @default 0\n */\n ttl?: Milliseconds\n\n /**\n * Minimum amount of time in ms in which to check for staleness.\n * Defaults to 1, which means that the current time is checked\n * at most once per millisecond.\n *\n * Set to 0 to check the current time every time staleness is tested.\n * (This reduces performance, and is theoretically unnecessary.)\n *\n * Setting this to a higher value will improve performance somewhat\n * while using ttl tracking, albeit at the expense of keeping stale\n * items around a bit longer than their TTLs would indicate.\n *\n * @default 1\n */\n ttlResolution?: Milliseconds\n\n /**\n * Preemptively remove stale items from the cache.\n * Note that this may significantly degrade performance,\n * especially if the cache is storing a large number of items.\n * It is almost always best to just leave the stale items in\n * the cache, and let them fall out as new items are added.\n *\n * Note that this means that {@link OptionsBase.allowStale} is a bit\n * pointless, as stale items will be deleted almost as soon as they\n * expire.\n *\n * @default false\n */\n ttlAutopurge?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#get}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnGet?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#has}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnHas?: boolean\n\n /**\n * Allow {@link LRUCache#get} and {@link LRUCache#fetch} calls to return\n * stale data, if available.\n */\n allowStale?: boolean\n\n /**\n * Function that is called on items when they are dropped from the cache.\n * This can be handy if you want to close file descriptors or do other\n * cleanup tasks when items are no longer accessible. Called with `key,\n * value`. It's called before actually removing the item from the\n * internal cache, so it is *NOT* safe to re-add them.\n *\n * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after\n * they have been full removed, when it is safe to add them back to the\n * cache.\n */\n dispose?: Disposer\n\n /**\n * The same as {@link OptionsBase.dispose}, but called *after* the entry\n * is completely removed and the cache is once again in a clean state.\n * It is safe to add an item right back into the cache at this point.\n * However, note that it is *very* easy to inadvertently create infinite\n * recursion this way.\n */\n disposeAfter?: Disposer\n\n /**\n * Set to true to suppress calling the\n * {@link OptionsBase.dispose} function if the entry key is\n * still accessible within the cache.\n * This may be overridden by passing an options object to\n * {@link LRUCache#set}.\n */\n noDisposeOnSet?: boolean\n\n /**\n * Boolean flag to tell the cache to not update the TTL when\n * setting a new value for an existing key (ie, when updating a value\n * rather than inserting a new value). Note that the TTL value is\n * _always_ set (if provided) when adding a new entry into the cache.\n *\n * Has no effect if a {@link OptionsBase.ttl} is not set.\n */\n noUpdateTTL?: boolean\n\n /**\n * If you wish to track item size, you must provide a maxSize\n * note that we still will only keep up to max *actual items*,\n * if max is set, so size tracking may cause fewer than max items\n * to be stored. At the extreme, a single item of maxSize size\n * will cause everything else in the cache to be dropped when it\n * is added. Use with caution!\n *\n * Note also that size tracking can negatively impact performance,\n * though for most cases, only minimally.\n */\n maxSize?: Size\n\n /**\n * The maximum allowed size for any single item in the cache.\n *\n * If a larger item is passed to {@link LRUCache#set} or returned by a\n * {@link OptionsBase.fetchMethod}, then it will not be stored in the\n * cache.\n */\n maxEntrySize?: Size\n\n /**\n * A function that returns a number indicating the item's size.\n *\n * If not provided, and {@link OptionsBase.maxSize} or\n * {@link OptionsBase.maxEntrySize} are set, then all\n * {@link LRUCache#set} calls **must** provide an explicit\n * {@link SetOptions.size} or sizeCalculation param.\n */\n sizeCalculation?: SizeCalculator\n\n /**\n * Method that provides the implementation for {@link LRUCache#fetch}\n */\n fetchMethod?: Fetcher\n\n /**\n * Set to true to suppress the deletion of stale data when a\n * {@link OptionsBase.fetchMethod} returns a rejected promise.\n */\n noDeleteOnFetchRejection?: boolean\n\n /**\n * Do not delete stale items when they are retrieved with\n * {@link LRUCache#get}.\n *\n * Note that the `get` return value will still be `undefined`\n * unless {@link OptionsBase.allowStale} is true.\n */\n noDeleteOnStaleGet?: boolean\n\n /**\n * Set to true to allow returning stale data when a\n * {@link OptionsBase.fetchMethod} throws an error or returns a rejected\n * promise.\n *\n * This differs from using {@link OptionsBase.allowStale} in that stale\n * data will ONLY be returned in the case that the\n * {@link LRUCache#fetch} fails, not any other times.\n */\n allowStaleOnFetchRejection?: boolean\n\n /**\n * Set to true to return a stale value from the cache when the\n * `AbortSignal` passed to the {@link OptionsBase.fetchMethod} dispatches an `'abort'`\n * event, whether user-triggered, or due to internal cache behavior.\n *\n * Unless {@link OptionsBase.ignoreFetchAbort} is also set, the underlying\n * {@link OptionsBase.fetchMethod} will still be considered canceled, and\n * any value it returns will be ignored and not cached.\n *\n * Caveat: since fetches are aborted when a new value is explicitly\n * set in the cache, this can lead to fetch returning a stale value,\n * since that was the fallback value _at the moment the `fetch()` was\n * initiated_, even though the new updated value is now present in\n * the cache.\n *\n * For example:\n *\n * ```ts\n * const cache = new LRUCache({\n * ttl: 100,\n * fetchMethod: async (url, oldValue, { signal }) => {\n * const res = await fetch(url, { signal })\n * return await res.json()\n * }\n * })\n * cache.set('https://example.com/', { some: 'data' })\n * // 100ms go by...\n * const result = cache.fetch('https://example.com/')\n * cache.set('https://example.com/', { other: 'thing' })\n * console.log(await result) // { some: 'data' }\n * console.log(cache.get('https://example.com/')) // { other: 'thing' }\n * ```\n */\n allowStaleOnFetchAbort?: boolean\n\n /**\n * Set to true to ignore the `abort` event emitted by the `AbortSignal`\n * object passed to {@link OptionsBase.fetchMethod}, and still cache the\n * resulting resolution value, as long as it is not `undefined`.\n *\n * When used on its own, this means aborted {@link LRUCache#fetch} calls are not\n * immediately resolved or rejected when they are aborted, and instead\n * take the full time to await.\n *\n * When used with {@link OptionsBase.allowStaleOnFetchAbort}, aborted\n * {@link LRUCache#fetch} calls will resolve immediately to their stale\n * cached value or `undefined`, and will continue to process and eventually\n * update the cache when they resolve, as long as the resulting value is\n * not `undefined`, thus supporting a \"return stale on timeout while\n * refreshing\" mechanism by passing `AbortSignal.timeout(n)` as the signal.\n *\n * **Note**: regardless of this setting, an `abort` event _is still\n * emitted on the `AbortSignal` object_, so may result in invalid results\n * when passed to other underlying APIs that use AbortSignals.\n *\n * This may be overridden in the {@link OptionsBase.fetchMethod} or the\n * call to {@link LRUCache#fetch}.\n */\n ignoreFetchAbort?: boolean\n }\n\n export interface OptionsMaxLimit\n extends OptionsBase {\n max: Count\n }\n export interface OptionsTTLLimit\n extends OptionsBase {\n ttl: Milliseconds\n ttlAutopurge: boolean\n }\n export interface OptionsSizeLimit\n extends OptionsBase {\n maxSize: Size\n }\n\n /**\n * The valid safe options for the {@link LRUCache} constructor\n */\n export type Options =\n | OptionsMaxLimit\n | OptionsSizeLimit\n | OptionsTTLLimit\n\n /**\n * Entry objects used by {@link LRUCache#load} and {@link LRUCache#dump},\n * and returned by {@link LRUCache#info}.\n */\n export interface Entry {\n value: V\n ttl?: Milliseconds\n size?: Size\n start?: Milliseconds\n }\n}\n\n/**\n * Default export, the thing you're using this module to get.\n *\n * All properties from the options object (with the exception of\n * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as\n * normal public members. (`max` and `maxBase` are read-only getters.)\n * Changing any of these will alter the defaults for subsequent method calls,\n * but is otherwise safe.\n */\nexport class LRUCache implements Map {\n // properties coming in from the options of these, only max and maxSize\n // really *need* to be protected. The rest can be modified, as they just\n // set defaults for various methods.\n readonly #max: LRUCache.Count\n readonly #maxSize: LRUCache.Size\n readonly #dispose?: LRUCache.Disposer\n readonly #disposeAfter?: LRUCache.Disposer\n readonly #fetchMethod?: LRUCache.Fetcher\n\n /**\n * {@link LRUCache.OptionsBase.ttl}\n */\n ttl: LRUCache.Milliseconds\n\n /**\n * {@link LRUCache.OptionsBase.ttlResolution}\n */\n ttlResolution: LRUCache.Milliseconds\n /**\n * {@link LRUCache.OptionsBase.ttlAutopurge}\n */\n ttlAutopurge: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnGet}\n */\n updateAgeOnGet: boolean\n /**\n * {@link LRUCache.OptionsBase.updateAgeOnHas}\n */\n updateAgeOnHas: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStale}\n */\n allowStale: boolean\n\n /**\n * {@link LRUCache.OptionsBase.noDisposeOnSet}\n */\n noDisposeOnSet: boolean\n /**\n * {@link LRUCache.OptionsBase.noUpdateTTL}\n */\n noUpdateTTL: boolean\n /**\n * {@link LRUCache.OptionsBase.maxEntrySize}\n */\n maxEntrySize: LRUCache.Size\n /**\n * {@link LRUCache.OptionsBase.sizeCalculation}\n */\n sizeCalculation?: LRUCache.SizeCalculator\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnFetchRejection}\n */\n noDeleteOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.noDeleteOnStaleGet}\n */\n noDeleteOnStaleGet: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort}\n */\n allowStaleOnFetchAbort: boolean\n /**\n * {@link LRUCache.OptionsBase.allowStaleOnFetchRejection}\n */\n allowStaleOnFetchRejection: boolean\n /**\n * {@link LRUCache.OptionsBase.ignoreFetchAbort}\n */\n ignoreFetchAbort: boolean\n\n // computed properties\n #size: LRUCache.Count\n #calculatedSize: LRUCache.Size\n #keyMap: Map\n #keyList: (K | undefined)[]\n #valList: (V | BackgroundFetch | undefined)[]\n #next: NumberArray\n #prev: NumberArray\n #head: Index\n #tail: Index\n #free: StackLike\n #disposed?: DisposeTask[]\n #sizes?: ZeroArray\n #starts?: ZeroArray\n #ttls?: ZeroArray\n\n #hasDispose: boolean\n #hasFetchMethod: boolean\n #hasDisposeAfter: boolean\n\n /**\n * Do not call this method unless you need to inspect the\n * inner workings of the cache. If anything returned by this\n * object is modified in any way, strange breakage may occur.\n *\n * These fields are private for a reason!\n *\n * @internal\n */\n static unsafeExposeInternals<\n K extends {},\n V extends {},\n FC extends unknown = unknown\n >(c: LRUCache) {\n return {\n // properties\n starts: c.#starts,\n ttls: c.#ttls,\n sizes: c.#sizes,\n keyMap: c.#keyMap as Map,\n keyList: c.#keyList,\n valList: c.#valList,\n next: c.#next,\n prev: c.#prev,\n get head() {\n return c.#head\n },\n get tail() {\n return c.#tail\n },\n free: c.#free,\n // methods\n isBackgroundFetch: (p: any) => c.#isBackgroundFetch(p),\n backgroundFetch: (\n k: K,\n index: number | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch =>\n c.#backgroundFetch(\n k,\n index as Index | undefined,\n options,\n context\n ),\n moveToTail: (index: number): void =>\n c.#moveToTail(index as Index),\n indexes: (options?: { allowStale: boolean }) =>\n c.#indexes(options),\n rindexes: (options?: { allowStale: boolean }) =>\n c.#rindexes(options),\n isStale: (index: number | undefined) =>\n c.#isStale(index as Index),\n }\n }\n\n // Protected read-only members\n\n /**\n * {@link LRUCache.OptionsBase.max} (read-only)\n */\n get max(): LRUCache.Count {\n return this.#max\n }\n /**\n * {@link LRUCache.OptionsBase.maxSize} (read-only)\n */\n get maxSize(): LRUCache.Count {\n return this.#maxSize\n }\n /**\n * The total computed size of items in the cache (read-only)\n */\n get calculatedSize(): LRUCache.Size {\n return this.#calculatedSize\n }\n /**\n * The number of items stored in the cache (read-only)\n */\n get size(): LRUCache.Count {\n return this.#size\n }\n /**\n * {@link LRUCache.OptionsBase.fetchMethod} (read-only)\n */\n get fetchMethod(): LRUCache.Fetcher | undefined {\n return this.#fetchMethod\n }\n /**\n * {@link LRUCache.OptionsBase.dispose} (read-only)\n */\n get dispose() {\n return this.#dispose\n }\n /**\n * {@link LRUCache.OptionsBase.disposeAfter} (read-only)\n */\n get disposeAfter() {\n return this.#disposeAfter\n }\n\n constructor(\n options: LRUCache.Options | LRUCache\n ) {\n const {\n max = 0,\n ttl,\n ttlResolution = 1,\n ttlAutopurge,\n updateAgeOnGet,\n updateAgeOnHas,\n allowStale,\n dispose,\n disposeAfter,\n noDisposeOnSet,\n noUpdateTTL,\n maxSize = 0,\n maxEntrySize = 0,\n sizeCalculation,\n fetchMethod,\n noDeleteOnFetchRejection,\n noDeleteOnStaleGet,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n } = options\n\n if (max !== 0 && !isPosInt(max)) {\n throw new TypeError('max option must be a nonnegative integer')\n }\n\n const UintArray = max ? getUintArray(max) : Array\n if (!UintArray) {\n throw new Error('invalid max value: ' + max)\n }\n\n this.#max = max\n this.#maxSize = maxSize\n this.maxEntrySize = maxEntrySize || this.#maxSize\n this.sizeCalculation = sizeCalculation\n if (this.sizeCalculation) {\n if (!this.#maxSize && !this.maxEntrySize) {\n throw new TypeError(\n 'cannot set sizeCalculation without setting maxSize or maxEntrySize'\n )\n }\n if (typeof this.sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation set to non-function')\n }\n }\n\n if (\n fetchMethod !== undefined &&\n typeof fetchMethod !== 'function'\n ) {\n throw new TypeError(\n 'fetchMethod must be a function if specified'\n )\n }\n this.#fetchMethod = fetchMethod\n this.#hasFetchMethod = !!fetchMethod\n\n this.#keyMap = new Map()\n this.#keyList = new Array(max).fill(undefined)\n this.#valList = new Array(max).fill(undefined)\n this.#next = new UintArray(max)\n this.#prev = new UintArray(max)\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free = Stack.create(max)\n this.#size = 0\n this.#calculatedSize = 0\n\n if (typeof dispose === 'function') {\n this.#dispose = dispose\n }\n if (typeof disposeAfter === 'function') {\n this.#disposeAfter = disposeAfter\n this.#disposed = []\n } else {\n this.#disposeAfter = undefined\n this.#disposed = undefined\n }\n this.#hasDispose = !!this.#dispose\n this.#hasDisposeAfter = !!this.#disposeAfter\n\n this.noDisposeOnSet = !!noDisposeOnSet\n this.noUpdateTTL = !!noUpdateTTL\n this.noDeleteOnFetchRejection = !!noDeleteOnFetchRejection\n this.allowStaleOnFetchRejection = !!allowStaleOnFetchRejection\n this.allowStaleOnFetchAbort = !!allowStaleOnFetchAbort\n this.ignoreFetchAbort = !!ignoreFetchAbort\n\n // NB: maxEntrySize is set to maxSize if it's set\n if (this.maxEntrySize !== 0) {\n if (this.#maxSize !== 0) {\n if (!isPosInt(this.#maxSize)) {\n throw new TypeError(\n 'maxSize must be a positive integer if specified'\n )\n }\n }\n if (!isPosInt(this.maxEntrySize)) {\n throw new TypeError(\n 'maxEntrySize must be a positive integer if specified'\n )\n }\n this.#initializeSizeTracking()\n }\n\n this.allowStale = !!allowStale\n this.noDeleteOnStaleGet = !!noDeleteOnStaleGet\n this.updateAgeOnGet = !!updateAgeOnGet\n this.updateAgeOnHas = !!updateAgeOnHas\n this.ttlResolution =\n isPosInt(ttlResolution) || ttlResolution === 0\n ? ttlResolution\n : 1\n this.ttlAutopurge = !!ttlAutopurge\n this.ttl = ttl || 0\n if (this.ttl) {\n if (!isPosInt(this.ttl)) {\n throw new TypeError(\n 'ttl must be a positive integer if specified'\n )\n }\n this.#initializeTTLTracking()\n }\n\n // do not allow completely unbounded caches\n if (this.#max === 0 && this.ttl === 0 && this.#maxSize === 0) {\n throw new TypeError(\n 'At least one of max, maxSize, or ttl is required'\n )\n }\n if (!this.ttlAutopurge && !this.#max && !this.#maxSize) {\n const code = 'LRU_CACHE_UNBOUNDED'\n if (shouldWarn(code)) {\n warned.add(code)\n const msg =\n 'TTL caching without ttlAutopurge, max, or maxSize can ' +\n 'result in unbounded memory consumption.'\n emitWarning(msg, 'UnboundedCacheWarning', code, LRUCache)\n }\n }\n }\n\n /**\n * Return the remaining TTL time for a given entry key\n */\n getRemainingTTL(key: K) {\n return this.#keyMap.has(key) ? Infinity : 0\n }\n\n #initializeTTLTracking() {\n const ttls = new ZeroArray(this.#max)\n const starts = new ZeroArray(this.#max)\n this.#ttls = ttls\n this.#starts = starts\n\n this.#setItemTTL = (index, ttl, start = perf.now()) => {\n starts[index] = ttl !== 0 ? start : 0\n ttls[index] = ttl\n if (ttl !== 0 && this.ttlAutopurge) {\n const t = setTimeout(() => {\n if (this.#isStale(index)) {\n this.delete(this.#keyList[index] as K)\n }\n }, ttl + 1)\n // unref() not supported on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n }\n\n this.#updateItemAge = index => {\n starts[index] = ttls[index] !== 0 ? perf.now() : 0\n }\n\n this.#statusTTL = (status, index) => {\n if (ttls[index]) {\n const ttl = ttls[index]\n const start = starts[index]\n /* c8 ignore next */\n if (!ttl || !start) return\n status.ttl = ttl\n status.start = start\n status.now = cachedNow || getNow()\n const age = status.now - start\n status.remainingTTL = ttl - age\n }\n }\n\n // debounce calls to perf.now() to 1s so we're not hitting\n // that costly call repeatedly.\n let cachedNow = 0\n const getNow = () => {\n const n = perf.now()\n if (this.ttlResolution > 0) {\n cachedNow = n\n const t = setTimeout(\n () => (cachedNow = 0),\n this.ttlResolution\n )\n // not available on all platforms\n /* c8 ignore start */\n if (t.unref) {\n t.unref()\n }\n /* c8 ignore stop */\n }\n return n\n }\n\n this.getRemainingTTL = key => {\n const index = this.#keyMap.get(key)\n if (index === undefined) {\n return 0\n }\n const ttl = ttls[index]\n const start = starts[index]\n if (!ttl || !start) {\n return Infinity\n }\n const age = (cachedNow || getNow()) - start\n return ttl - age\n }\n\n this.#isStale = index => {\n const s = starts[index]\n const t = ttls[index]\n return !!t && !!s && (cachedNow || getNow()) - s > t\n }\n }\n\n // conditionally set private methods related to TTL\n #updateItemAge: (index: Index) => void = () => {}\n #statusTTL: (status: LRUCache.Status, index: Index) => void =\n () => {}\n #setItemTTL: (\n index: Index,\n ttl: LRUCache.Milliseconds,\n start?: LRUCache.Milliseconds\n // ignore because we never call this if we're not already in TTL mode\n /* c8 ignore start */\n ) => void = () => {}\n /* c8 ignore stop */\n\n #isStale: (index: Index) => boolean = () => false\n\n #initializeSizeTracking() {\n const sizes = new ZeroArray(this.#max)\n this.#calculatedSize = 0\n this.#sizes = sizes\n this.#removeItemSize = index => {\n this.#calculatedSize -= sizes[index] as number\n sizes[index] = 0\n }\n this.#requireSize = (k, v, size, sizeCalculation) => {\n // provisionally accept background fetches.\n // actual value size will be checked when they return.\n if (this.#isBackgroundFetch(v)) {\n return 0\n }\n if (!isPosInt(size)) {\n if (sizeCalculation) {\n if (typeof sizeCalculation !== 'function') {\n throw new TypeError('sizeCalculation must be a function')\n }\n size = sizeCalculation(v, k)\n if (!isPosInt(size)) {\n throw new TypeError(\n 'sizeCalculation return invalid (expect positive integer)'\n )\n }\n } else {\n throw new TypeError(\n 'invalid size value (must be positive integer). ' +\n 'When maxSize or maxEntrySize is used, sizeCalculation ' +\n 'or size must be set.'\n )\n }\n }\n return size\n }\n this.#addItemSize = (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => {\n sizes[index] = size\n if (this.#maxSize) {\n const maxSize = this.#maxSize - (sizes[index] as number)\n while (this.#calculatedSize > maxSize) {\n this.#evict(true)\n }\n }\n this.#calculatedSize += sizes[index] as number\n if (status) {\n status.entrySize = size\n status.totalCalculatedSize = this.#calculatedSize\n }\n }\n }\n\n #removeItemSize: (index: Index) => void = _i => {}\n #addItemSize: (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status\n ) => void = (_i, _s, _st) => {}\n #requireSize: (\n k: K,\n v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => LRUCache.Size = (\n _k: K,\n _v: V | BackgroundFetch,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator\n ) => {\n if (size || sizeCalculation) {\n throw new TypeError(\n 'cannot set size without setting maxSize or maxEntrySize on cache'\n )\n }\n return 0\n };\n\n *#indexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#tail; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#head) {\n break\n } else {\n i = this.#prev[i] as Index\n }\n }\n }\n }\n\n *#rindexes({ allowStale = this.allowStale } = {}) {\n if (this.#size) {\n for (let i = this.#head; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\n if (allowStale || !this.#isStale(i)) {\n yield i\n }\n if (i === this.#tail) {\n break\n } else {\n i = this.#next[i] as Index\n }\n }\n }\n }\n\n #isValidIndex(index: Index) {\n return (\n index !== undefined &&\n this.#keyMap.get(this.#keyList[index] as K) === index\n )\n }\n\n /**\n * Return a generator yielding `[key, value]` pairs,\n * in order from most recently used to least recently used.\n */\n *entries() {\n for (const i of this.#indexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]] as [K, V]\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.entries}\n *\n * Return a generator yielding `[key, value]` pairs,\n * in order from least recently used to most recently used.\n */\n *rentries() {\n for (const i of this.#rindexes()) {\n if (\n this.#valList[i] !== undefined &&\n this.#keyList[i] !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield [this.#keyList[i], this.#valList[i]]\n }\n }\n }\n\n /**\n * Return a generator yielding the keys in the cache,\n * in order from most recently used to least recently used.\n */\n *keys() {\n for (const i of this.#indexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.keys}\n *\n * Return a generator yielding the keys in the cache,\n * in order from least recently used to most recently used.\n */\n *rkeys() {\n for (const i of this.#rindexes()) {\n const k = this.#keyList[i]\n if (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield k\n }\n }\n }\n\n /**\n * Return a generator yielding the values in the cache,\n * in order from most recently used to least recently used.\n */\n *values() {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i] as V\n }\n }\n }\n\n /**\n * Inverse order version of {@link LRUCache.values}\n *\n * Return a generator yielding the values in the cache,\n * in order from least recently used to most recently used.\n */\n *rvalues() {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n if (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\n yield this.#valList[i]\n }\n }\n }\n\n /**\n * Iterating over the cache itself yields the same results as\n * {@link LRUCache.entries}\n */\n [Symbol.iterator]() {\n return this.entries()\n }\n\n /**\n * A String value that is used in the creation of the default string description of an object.\n * Called by the built-in method Object.prototype.toString.\n */\n [Symbol.toStringTag] = 'LRUCache'\n\n /**\n * Find a value for which the supplied fn method returns a truthy value,\n * similar to Array.find(). fn is called as fn(value, key, cache).\n */\n find(\n fn: (v: V, k: K, self: LRUCache) => boolean,\n getOptions: LRUCache.GetOptions = {}\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n if (fn(value, this.#keyList[i] as K, this)) {\n return this.get(this.#keyList[i] as K, getOptions)\n }\n }\n }\n\n /**\n * Call the supplied function on each item in the cache, in order from\n * most recently used to least recently used. fn is called as\n * fn(value, key, cache). Does not update age or recenty of use.\n * Does not iterate over stale values.\n */\n forEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * The same as {@link LRUCache.forEach} but items are iterated over in\n * reverse order. (ie, less recently used items are iterated over first.)\n */\n rforEach(\n fn: (v: V, k: K, self: LRUCache) => any,\n thisp: any = this\n ) {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) continue\n fn.call(thisp, value, this.#keyList[i] as K, this)\n }\n }\n\n /**\n * Delete any stale entries. Returns true if anything was removed,\n * false otherwise.\n */\n purgeStale() {\n let deleted = false\n for (const i of this.#rindexes({ allowStale: true })) {\n if (this.#isStale(i)) {\n this.delete(this.#keyList[i] as K)\n deleted = true\n }\n }\n return deleted\n }\n\n /**\n * Get the extended info about a given entry, to get its value, size, and\n * TTL info simultaneously. Like {@link LRUCache#dump}, but just for a\n * single key. Always returns stale values, if their info is found in the\n * cache, so be sure to check for expired TTLs if relevant.\n */\n info(key: K): LRUCache.Entry | undefined {\n const i = this.#keyMap.get(key)\n if (i === undefined) return undefined\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) return undefined\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n const ttl = this.#ttls[i]\n const start = this.#starts[i]\n if (ttl && start) {\n const remain = ttl - (perf.now() - start)\n entry.ttl = remain\n entry.start = Date.now()\n }\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n return entry\n }\n\n /**\n * Return an array of [key, {@link LRUCache.Entry}] tuples which can be\n * passed to cache.load()\n */\n dump() {\n const arr: [K, LRUCache.Entry][] = []\n for (const i of this.#indexes({ allowStale: true })) {\n const key = this.#keyList[i]\n const v = this.#valList[i]\n const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined || key === undefined) continue\n const entry: LRUCache.Entry = { value }\n if (this.#ttls && this.#starts) {\n entry.ttl = this.#ttls[i]\n // always dump the start relative to a portable timestamp\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = perf.now() - (this.#starts[i] as number)\n entry.start = Math.floor(Date.now() - age)\n }\n if (this.#sizes) {\n entry.size = this.#sizes[i]\n }\n arr.unshift([key, entry])\n }\n return arr\n }\n\n /**\n * Reset the cache and load in the items in entries in the order listed.\n * Note that the shape of the resulting cache may be different if the\n * same options are not used in both caches.\n */\n load(arr: [K, LRUCache.Entry][]) {\n this.clear()\n for (const [key, entry] of arr) {\n if (entry.start) {\n // entry.start is a portable timestamp, but we may be using\n // node's performance.now(), so calculate the offset, so that\n // we get the intended remaining TTL, no matter how long it's\n // been on ice.\n //\n // it's ok for this to be a bit slow, it's a rare operation.\n const age = Date.now() - entry.start\n entry.start = perf.now() - age\n }\n this.set(key, entry.value, entry)\n }\n }\n\n /**\n * Add a value to the cache.\n *\n * Note: if `undefined` is specified as a value, this is an alias for\n * {@link LRUCache#delete}\n */\n set(\n k: K,\n v: V | BackgroundFetch | undefined,\n setOptions: LRUCache.SetOptions = {}\n ) {\n if (v === undefined) {\n this.delete(k)\n return this\n }\n const {\n ttl = this.ttl,\n start,\n noDisposeOnSet = this.noDisposeOnSet,\n sizeCalculation = this.sizeCalculation,\n status,\n } = setOptions\n let { noUpdateTTL = this.noUpdateTTL } = setOptions\n\n const size = this.#requireSize(\n k,\n v,\n setOptions.size || 0,\n sizeCalculation\n )\n // if the item doesn't fit, don't do anything\n // NB: maxEntrySize set to maxSize by default\n if (this.maxEntrySize && size > this.maxEntrySize) {\n if (status) {\n status.set = 'miss'\n status.maxEntrySizeExceeded = true\n }\n // have to delete, in case something is there already.\n this.delete(k)\n return this\n }\n let index = this.#size === 0 ? undefined : this.#keyMap.get(k)\n if (index === undefined) {\n // addition\n index = (\n this.#size === 0\n ? this.#tail\n : this.#free.length !== 0\n ? this.#free.pop()\n : this.#size === this.#max\n ? this.#evict(false)\n : this.#size\n ) as Index\n this.#keyList[index] = k\n this.#valList[index] = v\n this.#keyMap.set(k, index)\n this.#next[this.#tail] = index\n this.#prev[index] = this.#tail\n this.#tail = index\n this.#size++\n this.#addItemSize(index, size, status)\n if (status) status.set = 'add'\n noUpdateTTL = false\n } else {\n // update\n this.#moveToTail(index)\n const oldVal = this.#valList[index] as V | BackgroundFetch\n if (v !== oldVal) {\n if (this.#hasFetchMethod && this.#isBackgroundFetch(oldVal)) {\n oldVal.__abortController.abort(new Error('replaced'))\n const { __staleWhileFetching: s } = oldVal\n if (s !== undefined && !noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(s as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([s as V, k, 'set'])\n }\n }\n } else if (!noDisposeOnSet) {\n if (this.#hasDispose) {\n this.#dispose?.(oldVal as V, k, 'set')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([oldVal as V, k, 'set'])\n }\n }\n this.#removeItemSize(index)\n this.#addItemSize(index, size, status)\n this.#valList[index] = v\n if (status) {\n status.set = 'replace'\n const oldValue =\n oldVal && this.#isBackgroundFetch(oldVal)\n ? oldVal.__staleWhileFetching\n : oldVal\n if (oldValue !== undefined) status.oldValue = oldValue\n }\n } else if (status) {\n status.set = 'update'\n }\n }\n if (ttl !== 0 && !this.#ttls) {\n this.#initializeTTLTracking()\n }\n if (this.#ttls) {\n if (!noUpdateTTL) {\n this.#setItemTTL(index, ttl, start)\n }\n if (status) this.#statusTTL(status, index)\n }\n if (!noDisposeOnSet && this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return this\n }\n\n /**\n * Evict the least recently used item, returning its value or\n * `undefined` if cache is empty.\n */\n pop(): V | undefined {\n try {\n while (this.#size) {\n const val = this.#valList[this.#head]\n this.#evict(true)\n if (this.#isBackgroundFetch(val)) {\n if (val.__staleWhileFetching) {\n return val.__staleWhileFetching\n }\n } else if (val !== undefined) {\n return val\n }\n }\n } finally {\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n }\n\n #evict(free: boolean) {\n const head = this.#head\n const k = this.#keyList[head] as K\n const v = this.#valList[head] as V\n if (this.#hasFetchMethod && this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('evicted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v, k, 'evict')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v, k, 'evict'])\n }\n }\n this.#removeItemSize(head)\n // if we aren't about to use the index, then null these out\n if (free) {\n this.#keyList[head] = undefined\n this.#valList[head] = undefined\n this.#free.push(head)\n }\n if (this.#size === 1) {\n this.#head = this.#tail = 0 as Index\n this.#free.length = 0\n } else {\n this.#head = this.#next[head] as Index\n }\n this.#keyMap.delete(k)\n this.#size--\n return head\n }\n\n /**\n * Check if a key is in the cache, without updating the recency of use.\n * Will return false if the item is stale, even though it is technically\n * in the cache.\n *\n * Will not update item age unless\n * {@link LRUCache.OptionsBase.updateAgeOnHas} is set.\n */\n has(k: K, hasOptions: LRUCache.HasOptions = {}) {\n const { updateAgeOnHas = this.updateAgeOnHas, status } =\n hasOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const v = this.#valList[index]\n if (\n this.#isBackgroundFetch(v) &&\n v.__staleWhileFetching === undefined\n ) {\n return false\n }\n if (!this.#isStale(index)) {\n if (updateAgeOnHas) {\n this.#updateItemAge(index)\n }\n if (status) {\n status.has = 'hit'\n this.#statusTTL(status, index)\n }\n return true\n } else if (status) {\n status.has = 'stale'\n this.#statusTTL(status, index)\n }\n } else if (status) {\n status.has = 'miss'\n }\n return false\n }\n\n /**\n * Like {@link LRUCache#get} but doesn't update recency or delete stale\n * items.\n *\n * Returns `undefined` if the item is stale, unless\n * {@link LRUCache.OptionsBase.allowStale} is set.\n */\n peek(k: K, peekOptions: LRUCache.PeekOptions = {}) {\n const { allowStale = this.allowStale } = peekOptions\n const index = this.#keyMap.get(k)\n if (\n index === undefined ||\n (!allowStale && this.#isStale(index))\n ) {\n return\n }\n const v = this.#valList[index]\n // either stale and allowed, or forcing a refresh of non-stale value\n return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v\n }\n\n #backgroundFetch(\n k: K,\n index: Index | undefined,\n options: LRUCache.FetchOptions,\n context: any\n ): BackgroundFetch {\n const v = index === undefined ? undefined : this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n return v\n }\n\n const ac = new AC()\n const { signal } = options\n // when/if our AC signals, then stop listening to theirs.\n signal?.addEventListener('abort', () => ac.abort(signal.reason), {\n signal: ac.signal,\n })\n\n const fetchOpts = {\n signal: ac.signal,\n options,\n context,\n }\n\n const cb = (\n v: V | undefined,\n updateCache = false\n ): V | undefined => {\n const { aborted } = ac.signal\n const ignoreAbort = options.ignoreFetchAbort && v !== undefined\n if (options.status) {\n if (aborted && !updateCache) {\n options.status.fetchAborted = true\n options.status.fetchError = ac.signal.reason\n if (ignoreAbort) options.status.fetchAbortIgnored = true\n } else {\n options.status.fetchResolved = true\n }\n }\n if (aborted && !ignoreAbort && !updateCache) {\n return fetchFail(ac.signal.reason)\n }\n // either we didn't abort, and are still here, or we did, and ignored\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n if (v === undefined) {\n if (bf.__staleWhileFetching) {\n this.#valList[index as Index] = bf.__staleWhileFetching\n } else {\n this.delete(k)\n }\n } else {\n if (options.status) options.status.fetchUpdated = true\n this.set(k, v, fetchOpts.options)\n }\n }\n return v\n }\n\n const eb = (er: any) => {\n if (options.status) {\n options.status.fetchRejected = true\n options.status.fetchError = er\n }\n return fetchFail(er)\n }\n\n const fetchFail = (er: any): V | undefined => {\n const { aborted } = ac.signal\n const allowStaleAborted =\n aborted && options.allowStaleOnFetchAbort\n const allowStale =\n allowStaleAborted || options.allowStaleOnFetchRejection\n const noDelete = allowStale || options.noDeleteOnFetchRejection\n const bf = p as BackgroundFetch\n if (this.#valList[index as Index] === p) {\n // if we allow stale on fetch rejections, then we need to ensure that\n // the stale value is not removed from the cache when the fetch fails.\n const del = !noDelete || bf.__staleWhileFetching === undefined\n if (del) {\n this.delete(k)\n } else if (!allowStaleAborted) {\n // still replace the *promise* with the stale value,\n // since we are done with the promise at this point.\n // leave it untouched if we're still waiting for an\n // aborted background fetch that hasn't yet returned.\n this.#valList[index as Index] = bf.__staleWhileFetching\n }\n }\n if (allowStale) {\n if (options.status && bf.__staleWhileFetching !== undefined) {\n options.status.returnedStale = true\n }\n return bf.__staleWhileFetching\n } else if (bf.__returned === bf) {\n throw er\n }\n }\n\n const pcall = (\n res: (v: V | undefined) => void,\n rej: (e: any) => void\n ) => {\n const fmp = this.#fetchMethod?.(k, v, fetchOpts)\n if (fmp && fmp instanceof Promise) {\n fmp.then(v => res(v === undefined ? undefined : v), rej)\n }\n // ignored, we go until we finish, regardless.\n // defer check until we are actually aborting,\n // so fetchMethod can override.\n ac.signal.addEventListener('abort', () => {\n if (\n !options.ignoreFetchAbort ||\n options.allowStaleOnFetchAbort\n ) {\n res(undefined)\n // when it eventually resolves, update the cache.\n if (options.allowStaleOnFetchAbort) {\n res = v => cb(v, true)\n }\n }\n })\n }\n\n if (options.status) options.status.fetchDispatched = true\n const p = new Promise(pcall).then(cb, eb)\n const bf: BackgroundFetch = Object.assign(p, {\n __abortController: ac,\n __staleWhileFetching: v,\n __returned: undefined,\n })\n\n if (index === undefined) {\n // internal, don't expose status.\n this.set(k, bf, { ...fetchOpts.options, status: undefined })\n index = this.#keyMap.get(k)\n } else {\n this.#valList[index] = bf\n }\n return bf\n }\n\n #isBackgroundFetch(p: any): p is BackgroundFetch {\n if (!this.#hasFetchMethod) return false\n const b = p as BackgroundFetch\n return (\n !!b &&\n b instanceof Promise &&\n b.hasOwnProperty('__staleWhileFetching') &&\n b.__abortController instanceof AC\n )\n }\n\n /**\n * Make an asynchronous cached fetch using the\n * {@link LRUCache.OptionsBase.fetchMethod} function.\n *\n * If multiple fetches for the same key are issued, then they will all be\n * coalesced into a single call to fetchMethod.\n *\n * Note that this means that handling options such as\n * {@link LRUCache.OptionsBase.allowStaleOnFetchAbort},\n * {@link LRUCache.FetchOptions.signal},\n * and {@link LRUCache.OptionsBase.allowStaleOnFetchRejection} will be\n * determined by the FIRST fetch() call for a given key.\n *\n * This is a known (fixable) shortcoming which will be addresed on when\n * someone complains about it, as the fix would involve added complexity and\n * may not be worth the costs for this edge case.\n */\n fetch(\n k: K,\n fetchOptions: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : LRUCache.FetchOptionsWithContext\n ): Promise\n // this overload not allowed if context is required\n fetch(\n k: unknown extends FC\n ? K\n : FC extends undefined | void\n ? K\n : never,\n fetchOptions?: unknown extends FC\n ? LRUCache.FetchOptions\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext\n : never\n ): Promise\n async fetch(\n k: K,\n fetchOptions: LRUCache.FetchOptions = {}\n ): Promise {\n const {\n // get options\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n // set options\n ttl = this.ttl,\n noDisposeOnSet = this.noDisposeOnSet,\n size = 0,\n sizeCalculation = this.sizeCalculation,\n noUpdateTTL = this.noUpdateTTL,\n // fetch exclusive options\n noDeleteOnFetchRejection = this.noDeleteOnFetchRejection,\n allowStaleOnFetchRejection = this.allowStaleOnFetchRejection,\n ignoreFetchAbort = this.ignoreFetchAbort,\n allowStaleOnFetchAbort = this.allowStaleOnFetchAbort,\n context,\n forceRefresh = false,\n status,\n signal,\n } = fetchOptions\n\n if (!this.#hasFetchMethod) {\n if (status) status.fetch = 'get'\n return this.get(k, {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n status,\n })\n }\n\n const options = {\n allowStale,\n updateAgeOnGet,\n noDeleteOnStaleGet,\n ttl,\n noDisposeOnSet,\n size,\n sizeCalculation,\n noUpdateTTL,\n noDeleteOnFetchRejection,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n status,\n signal,\n }\n\n let index = this.#keyMap.get(k)\n if (index === undefined) {\n if (status) status.fetch = 'miss'\n const p = this.#backgroundFetch(k, index, options, context)\n return (p.__returned = p)\n } else {\n // in cache, maybe already fetching\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n const stale =\n allowStale && v.__staleWhileFetching !== undefined\n if (status) {\n status.fetch = 'inflight'\n if (stale) status.returnedStale = true\n }\n return stale ? v.__staleWhileFetching : (v.__returned = v)\n }\n\n // if we force a refresh, that means do NOT serve the cached value,\n // unless we are already in the process of refreshing the cache.\n const isStale = this.#isStale(index)\n if (!forceRefresh && !isStale) {\n if (status) status.fetch = 'hit'\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n if (status) this.#statusTTL(status, index)\n return v\n }\n\n // ok, it is stale or a forced refresh, and not already fetching.\n // refresh the cache.\n const p = this.#backgroundFetch(k, index, options, context)\n const hasStale = p.__staleWhileFetching !== undefined\n const staleVal = hasStale && allowStale\n if (status) {\n status.fetch = isStale ? 'stale' : 'refresh'\n if (staleVal && isStale) status.returnedStale = true\n }\n return staleVal ? p.__staleWhileFetching : (p.__returned = p)\n }\n }\n\n /**\n * Return a value from the cache. Will update the recency of the cache\n * entry found.\n *\n * If the key is not found, get() will return `undefined`.\n */\n get(k: K, getOptions: LRUCache.GetOptions = {}) {\n const {\n allowStale = this.allowStale,\n updateAgeOnGet = this.updateAgeOnGet,\n noDeleteOnStaleGet = this.noDeleteOnStaleGet,\n status,\n } = getOptions\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n const value = this.#valList[index]\n const fetching = this.#isBackgroundFetch(value)\n if (status) this.#statusTTL(status, index)\n if (this.#isStale(index)) {\n if (status) status.get = 'stale'\n // delete only if not an in-flight background fetch\n if (!fetching) {\n if (!noDeleteOnStaleGet) {\n this.delete(k)\n }\n if (status && allowStale) status.returnedStale = true\n return allowStale ? value : undefined\n } else {\n if (\n status &&\n allowStale &&\n value.__staleWhileFetching !== undefined\n ) {\n status.returnedStale = true\n }\n return allowStale ? value.__staleWhileFetching : undefined\n }\n } else {\n if (status) status.get = 'hit'\n // if we're currently fetching it, we don't actually have it yet\n // it's not stale, which means this isn't a staleWhileRefetching.\n // If it's not stale, and fetching, AND has a __staleWhileFetching\n // value, then that means the user fetched with {forceRefresh:true},\n // so it's safe to return that value.\n if (fetching) {\n return value.__staleWhileFetching\n }\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n return value\n }\n } else if (status) {\n status.get = 'miss'\n }\n }\n\n #connect(p: Index, n: Index) {\n this.#prev[n] = p\n this.#next[p] = n\n }\n\n #moveToTail(index: Index): void {\n // if tail already, nothing to do\n // if head, move head to next[index]\n // else\n // move next[prev[index]] to next[index] (head has no prev)\n // move prev[next[index]] to prev[index]\n // prev[index] = tail\n // next[tail] = index\n // tail = index\n if (index !== this.#tail) {\n if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n this.#connect(\n this.#prev[index] as Index,\n this.#next[index] as Index\n )\n }\n this.#connect(this.#tail, index)\n this.#tail = index\n }\n }\n\n /**\n * Deletes a key out of the cache.\n * Returns true if the key was deleted, false otherwise.\n */\n delete(k: K) {\n let deleted = false\n if (this.#size !== 0) {\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n deleted = true\n if (this.#size === 1) {\n this.clear()\n } else {\n this.#removeItemSize(index)\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else if (this.#hasDispose || this.#hasDisposeAfter) {\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k, 'delete'])\n }\n }\n this.#keyMap.delete(k)\n this.#keyList[index] = undefined\n this.#valList[index] = undefined\n if (index === this.#tail) {\n this.#tail = this.#prev[index] as Index\n } else if (index === this.#head) {\n this.#head = this.#next[index] as Index\n } else {\n const pi = this.#prev[index] as number\n this.#next[pi] = this.#next[index] as number\n const ni = this.#next[index] as number\n this.#prev[ni] = this.#prev[index] as number\n }\n this.#size--\n this.#free.push(index)\n }\n }\n }\n if (this.#hasDisposeAfter && this.#disposed?.length) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n return deleted\n }\n\n /**\n * Clear the cache entirely, throwing away all values.\n */\n clear() {\n for (const index of this.#rindexes({ allowStale: true })) {\n const v = this.#valList[index]\n if (this.#isBackgroundFetch(v)) {\n v.__abortController.abort(new Error('deleted'))\n } else {\n const k = this.#keyList[index]\n if (this.#hasDispose) {\n this.#dispose?.(v as V, k as K, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k as K, 'delete'])\n }\n }\n }\n\n this.#keyMap.clear()\n this.#valList.fill(undefined)\n this.#keyList.fill(undefined)\n if (this.#ttls && this.#starts) {\n this.#ttls.fill(0)\n this.#starts.fill(0)\n }\n if (this.#sizes) {\n this.#sizes.fill(0)\n }\n this.#head = 0 as Index\n this.#tail = 0 as Index\n this.#free.length = 0\n this.#calculatedSize = 0\n this.#size = 0\n if (this.#hasDisposeAfter && this.#disposed) {\n const dt = this.#disposed\n let task: DisposeTask | undefined\n while ((task = dt?.shift())) {\n this.#disposeAfter?.(...task)\n }\n }\n }\n}\n\nexport default LRUCache\n"], + "mappings": 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+ "names": ["perf", "warned", "PROCESS", "emitWarning", "msg", "type", "code", "fn", "AC", "AS", "_", "warnACPolyfill", "reason", "printACPolyfillWarning", "shouldWarn", "TYPE", "isPosInt", "n", "getUintArray", "max", "ZeroArray", "size", "_constructing", "_Stack", "HeapCls", "__privateSet", "s", "__privateGet", "Stack", "__privateAdd", "LRUCache", "#max", "#maxSize", "#dispose", "#disposeAfter", "#fetchMethod", "#size", "#calculatedSize", "#keyMap", "#keyList", "#valList", "#next", "#prev", "#head", "#tail", "#free", "#disposed", "#sizes", "#starts", "#ttls", "#hasDispose", "#hasFetchMethod", "#hasDisposeAfter", "c", "p", "#isBackgroundFetch", "k", "index", "options", "context", "#backgroundFetch", "#moveToTail", "#indexes", "#rindexes", "#isStale", "ttl", "ttlResolution", "ttlAutopurge", "updateAgeOnGet", "updateAgeOnHas", "allowStale", "dispose", "disposeAfter", "noDisposeOnSet", "noUpdateTTL", "maxSize", "maxEntrySize", "sizeCalculation", "fetchMethod", "noDeleteOnFetchRejection", 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+++ b/dist/esm/package.json @@ -0,0 +1,3 @@ +{ + "type": "module" +} diff --git a/dist/node_modules/@bubblegroup/lru-cache b/dist/node_modules/@bubblegroup/lru-cache new file mode 120000 index 0000000..a8a4f8c --- /dev/null +++ b/dist/node_modules/@bubblegroup/lru-cache @@ -0,0 +1 @@ +../../.. \ No newline at end of file diff --git a/package.json b/package.json index a1482ac..38b7ea9 100644 --- a/package.json +++ b/package.json @@ -1,7 +1,7 @@ { "name": "@bubblegroup/lru-cache", "description": "A cache object that deletes the least-recently-used items.", - "version": "10.3.0", + "version": "10.3.0-patch.1", "author": "Isaac Z. Schlueter ", "keywords": [ "mru", @@ -10,10 +10,6 @@ ], "sideEffects": false, "scripts": { - "build": "npm run prepare", - "prepare": "tshy && bash fixup.sh", - "pretest": "npm run prepare", - "presnap": "npm run prepare", "test": "tap", "snap": "tap", "preversion": "npm test", @@ -22,9 +18,7 @@ "format": "prettier --write .", "typedoc": "typedoc --tsconfig ./.tshy/esm.json ./src/*.ts", "benchmark-results-typedoc": "bash scripts/benchmark-results-typedoc.sh", - "prebenchmark": "npm run prepare", "benchmark": "make -C benchmark", - "preprofile": "npm run prepare", "profile": "make -C benchmark profile" }, "main": "./dist/commonjs/index.js", From 59d909ed42eb9562894fa4bdc583d176b0303a59 Mon Sep 17 00:00:00 2001 From: Stephen Ingram Date: Fri, 11 Oct 2024 11:12:47 -0400 Subject: [PATCH 2/2] del - remove symlink from dist --- dist/node_modules/@bubblegroup/lru-cache | 1 - 1 file changed, 1 deletion(-) delete mode 120000 dist/node_modules/@bubblegroup/lru-cache diff --git a/dist/node_modules/@bubblegroup/lru-cache b/dist/node_modules/@bubblegroup/lru-cache deleted file mode 120000 index a8a4f8c..0000000 --- a/dist/node_modules/@bubblegroup/lru-cache +++ /dev/null @@ -1 +0,0 @@ -../../.. \ No newline at end of file