From 7b4db77c4feac45b38cb707c7054ef202e76dbd2 Mon Sep 17 00:00:00 2001
From: Wang Guan <momocraft@gmail.com>
Date: Wed, 8 May 2024 02:21:40 +0900
Subject: [PATCH 1/4] lazyThenable: simplify type & add executed()

---
 src/concurrency/lazy-thenable.ts | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/concurrency/lazy-thenable.ts b/src/concurrency/lazy-thenable.ts
index d1954ed..6e1912a 100644
--- a/src/concurrency/lazy-thenable.ts
+++ b/src/concurrency/lazy-thenable.ts
@@ -3,14 +3,18 @@
  * @param io
  * @return
  */
-export function lazyThenable<T>(io: () => T): PromiseLike<Awaited<T>> {
+export function lazyThenable<T>(io: () => T): LazyThenable<Awaited<T>> {
   let r: null | Promise<Awaited<T>> = null;
   return {
-    then<TResult1, TResult2 = never>(
-      onfulfilled?: ((value: Awaited<T>) => PromiseLike<TResult1> | TResult1) | undefined | null,
-      onrejected?: ((reason: any) => PromiseLike<TResult2> | TResult2) | undefined | null,
-    ): PromiseLike<TResult1 | TResult2> {
+    get executed(): boolean {
+      return r !== null;
+    },
+    then(onfulfilled, onrejected): PromiseLike<any> {
       return (r ??= Promise.resolve(io())).then(onfulfilled, onrejected);
     },
   };
 }
+
+interface LazyThenable<T> extends PromiseLike<T> {
+  get executed(): boolean;
+}

From d1bfc2787666509e0f009e67520bba736c33c99e Mon Sep 17 00:00:00 2001
From: Wang Guan <momocraft@gmail.com>
Date: Sat, 11 May 2024 01:58:06 +0900
Subject: [PATCH 2/4] test

---
 src/concurrency/lazy-thenable.spec.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/concurrency/lazy-thenable.spec.ts b/src/concurrency/lazy-thenable.spec.ts
index 41d6463..2f747b8 100644
--- a/src/concurrency/lazy-thenable.spec.ts
+++ b/src/concurrency/lazy-thenable.spec.ts
@@ -7,10 +7,13 @@ describe(lazyThenable, () => {
     const lazy1 = lazyThenable(async () => ++called);
 
     expect(called).toEqual(0);
+    expect(lazy1.executed).toBe(false)
 
     const converted = Promise.resolve(lazy1);
     expect(called).toEqual(0);
+    expect(lazy1.executed).toBe(true)
     await wait(0);
+    expect(lazy1.executed).toBe(true)
     expect(called).toEqual(1);
     expect(await converted).toEqual(1);
     expect(await lazy1).toEqual(1);

From faa41ca7f971f2039693d8a9e91328d0957568de Mon Sep 17 00:00:00 2001
From: Wang Guan <momocraft@gmail.com>
Date: Sat, 11 May 2024 02:02:01 +0900
Subject: [PATCH 3/4] make linter happy

---
 src/concurrency/lazy-thenable.spec.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/concurrency/lazy-thenable.spec.ts b/src/concurrency/lazy-thenable.spec.ts
index 2f747b8..19bb97d 100644
--- a/src/concurrency/lazy-thenable.spec.ts
+++ b/src/concurrency/lazy-thenable.spec.ts
@@ -7,13 +7,13 @@ describe(lazyThenable, () => {
     const lazy1 = lazyThenable(async () => ++called);
 
     expect(called).toEqual(0);
-    expect(lazy1.executed).toBe(false)
+    expect(lazy1.executed).toBe(false);
 
     const converted = Promise.resolve(lazy1);
     expect(called).toEqual(0);
-    expect(lazy1.executed).toBe(true)
+    expect(lazy1.executed).toBe(true);
     await wait(0);
-    expect(lazy1.executed).toBe(true)
+    expect(lazy1.executed).toBe(true);
     expect(called).toEqual(1);
     expect(await converted).toEqual(1);
     expect(await lazy1).toEqual(1);

From c2682e22eed6eb1121e1d2ab9b211e31ebc926d8 Mon Sep 17 00:00:00 2001
From: Wang Guan <momocraft@gmail.com>
Date: Sat, 11 May 2024 02:08:43 +0900
Subject: [PATCH 4/4] fix

---
 src/concurrency/lazy-thenable.spec.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/concurrency/lazy-thenable.spec.ts b/src/concurrency/lazy-thenable.spec.ts
index 19bb97d..6d05f47 100644
--- a/src/concurrency/lazy-thenable.spec.ts
+++ b/src/concurrency/lazy-thenable.spec.ts
@@ -11,7 +11,7 @@ describe(lazyThenable, () => {
 
     const converted = Promise.resolve(lazy1);
     expect(called).toEqual(0);
-    expect(lazy1.executed).toBe(true);
+    expect(lazy1.executed).toBe(false);
     await wait(0);
     expect(lazy1.executed).toBe(true);
     expect(called).toEqual(1);