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Improve handling of localStorage and svelte stores
Also moving the svelte-stored-writable package into the repo. So we have it closer for maintenance, we can eventually rewrite it in svelte 5 runes later. Reference: efstajas/svelte-stored-writable#5
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| import type { SafeParseReturnType } from "zod"; | ||
| import type { Writable } from "svelte/store"; | ||
|
|
||
| import { writable, get } from "svelte/store"; | ||
| import { z } from "zod"; | ||
|
|
||
| type Equals<X, Y> = | ||
| (<T>() => T extends X ? 1 : 2) extends <T>() => T extends Y ? 1 : 2 | ||
| ? true | ||
| : false; | ||
|
|
||
| /** | ||
| * An extension of Svelte's `writable` that also saves its state to localStorage and | ||
| * automatically restores it. | ||
| * @param key The localStorage key to use for saving the writable's contents. | ||
| * @param schema A Zod schema describing the contents of the writable. | ||
| * @param initialValue The initial value to use if no prior state has been saved in | ||
| * localstorage. | ||
| * @param disableLocalStorage Skip interaction with localStorage, for example during SSR. | ||
| * @returns A stored writable. | ||
| */ | ||
| export default function storedWritable< | ||
| S extends z.infer<T>, | ||
| T extends z.ZodType = z.ZodType<S>, | ||
| >( | ||
| key: string, | ||
| schema: T, | ||
| initialValue: z.infer<typeof schema>, | ||
| disableLocalStorage = false, | ||
| ): Writable< | ||
| Equals<T, typeof schema> extends true ? S : z.infer<typeof schema> | ||
| > & { clear: () => void } { | ||
| const stored = !disableLocalStorage ? localStorage.getItem(key) : null; | ||
|
|
||
| const parseFromJson = ( | ||
| content: string, | ||
| ): SafeParseReturnType<string, T["_output"]> => { | ||
| return z | ||
| .string() | ||
| .transform((_, ctx) => { | ||
| try { | ||
| return JSON.parse(content); | ||
| } catch { | ||
| ctx.addIssue({ | ||
| code: z.ZodIssueCode.custom, | ||
| message: "invalid json", | ||
| }); | ||
| return z.never; | ||
| } | ||
| }) | ||
| .pipe(schema) | ||
| .safeParse(content); | ||
| }; | ||
|
|
||
| // Subscribe to window storage event to keep changes from another tab in sync. | ||
| if (!disableLocalStorage) { | ||
| window?.addEventListener("storage", event => { | ||
| if (event.key === key) { | ||
| if (event.newValue === null) { | ||
| w.set(initialValue); | ||
| return; | ||
| } | ||
|
|
||
| const { success, data } = parseFromJson(event.newValue); | ||
| w.set(success ? data : initialValue); | ||
| } | ||
| }); | ||
| } | ||
| const parsed = parseFromJson(stored || initialValue); | ||
| const w = writable<S>(parsed?.success ? parsed.data : initialValue); | ||
|
|
||
| /** | ||
| * Set writable value and inform subscribers. Updates the writeable's stored data in | ||
| * localstorage. | ||
| * */ | ||
| function set(...args: Parameters<typeof w.set>) { | ||
| w.set(...args); | ||
| if (!disableLocalStorage) localStorage.setItem(key, JSON.stringify(get(w))); | ||
| } | ||
|
|
||
| /** | ||
| * Update writable value using a callback and inform subscribers. Updates the writeable's | ||
| * stored data in localstorage. | ||
| * */ | ||
| function update(...args: Parameters<typeof w.update>) { | ||
| w.update(...args); | ||
| if (!disableLocalStorage) localStorage.setItem(key, JSON.stringify(get(w))); | ||
| } | ||
|
|
||
| /** | ||
| * Delete any data saved for this StoredWritable in localstorage. | ||
| */ | ||
| function clear() { | ||
| w.set(initialValue); | ||
| localStorage.removeItem(key); | ||
| } | ||
|
|
||
| return { | ||
| subscribe: w.subscribe, | ||
| set, | ||
| update, | ||
| clear, | ||
| }; | ||
| } |
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