86 lines
3 KiB
TypeScript
86 lines
3 KiB
TypeScript
//// [awaitedTypeStrictNull.ts]
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type T1 = Awaited<number>;
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type T2 = Awaited<Promise<number>>;
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type T3 = Awaited<number | Promise<number>>;
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type T4 = Awaited<number | Promise<string>>;
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type T5 = Awaited<{ then: number }>;
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type T6 = Awaited<{ then(): void }>; // never (non-promise "thenable")
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type T7 = Awaited<{ then(x: number): void }>; // never (non-promise "thenable")
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type T8 = Awaited<{ then(x: () => void): void }>; // unknown
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type T9 = Awaited<any>;
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type T10 = Awaited<never>;
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type T11 = Awaited<unknown>;
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type T12 = Awaited<Promise<Promise<number>>>;
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type T13 = _Expect<Awaited<Promise<Promise<number>> | string | null>, /*expected*/ string | number | null>; // otherwise just prints T13 in types tests, which isn't very helpful
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type T14 = _Expect<Awaited<Promise<Promise<number>> | string | undefined>, /*expected*/ string | number | undefined>; // otherwise just prints T14 in types tests, which isn't very helpful
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type T15 = _Expect<Awaited<Promise<Promise<number>> | string | null | undefined>, /*expected*/ string | number | null | undefined>; // otherwise just prints T15 in types tests, which isn't very helpful
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interface BadPromise { then(cb: (value: BadPromise) => void): void; }
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type T16 = Awaited<BadPromise>; // error
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interface BadPromise1 { then(cb: (value: BadPromise2) => void): void; }
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interface BadPromise2 { then(cb: (value: BadPromise1) => void): void; }
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type T17 = Awaited<BadPromise1>; // error
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// https://github.com/microsoft/TypeScript/issues/33562
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type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
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declare function MaybePromise<T>(value: T): MaybePromise<T>;
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async function main() {
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let aaa: number;
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let bbb: string;
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[
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aaa,
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bbb,
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] = await Promise.all([
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MaybePromise(1),
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MaybePromise('2'),
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MaybePromise(true),
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])
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}
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// https://github.com/microsoft/TypeScript/issues/45924
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class Api<D = {}> {
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// Should result in `Promise<T>` instead of `Promise<Awaited<T>>`.
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async post<T = D>() { return this.request<T>(); }
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async request<D>(): Promise<D> { throw new Error(); }
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}
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declare const api: Api;
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interface Obj { x: number }
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async function fn<T>(): Promise<T extends object ? { [K in keyof T]: Obj } : Obj> {
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// Per #45924, this was failing due to incorrect inference both above and here.
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// Should not error.
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return api.post();
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}
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// helps with tests where '.types' just prints out the type alias name
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type _Expect<TActual extends TExpected, TExpected> = TActual;
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//// [awaitedTypeStrictNull.js]
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async function main() {
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let aaa;
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let bbb;
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[
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aaa,
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bbb,
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] = await Promise.all([
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MaybePromise(1),
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MaybePromise('2'),
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MaybePromise(true),
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]);
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}
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// https://github.com/microsoft/TypeScript/issues/45924
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class Api {
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// Should result in `Promise<T>` instead of `Promise<Awaited<T>>`.
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async post() { return this.request(); }
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async request() { throw new Error(); }
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}
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async function fn() {
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// Per #45924, this was failing due to incorrect inference both above and here.
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// Should not error.
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return api.post();
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}
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