76 lines
2.6 KiB
TypeScript
76 lines
2.6 KiB
TypeScript
// @target: ES6
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async function fAsync() {
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// Without explicit type annotation, this is just an array.
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return [1, true];
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}
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async function fAsyncExplicit(): Promise<[number, boolean]> {
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// This is contextually typed as a tuple.
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return [1, true];
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}
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// https://github.com/Microsoft/TypeScript/issues/13128
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interface Obj {
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stringProp: string;
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anyProp: any;
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}
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async function fIndexedTypeForStringProp(obj: Obj): Promise<Obj["stringProp"]> {
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return obj.stringProp;
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}
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async function fIndexedTypeForPromiseOfStringProp(obj: Obj): Promise<Obj["stringProp"]> {
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return Promise.resolve(obj.stringProp);
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}
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async function fIndexedTypeForExplicitPromiseOfStringProp(obj: Obj): Promise<Obj["stringProp"]> {
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return Promise.resolve<Obj["stringProp"]>(obj.stringProp);
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}
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async function fIndexedTypeForAnyProp(obj: Obj): Promise<Obj["anyProp"]> {
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return obj.anyProp;
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}
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async function fIndexedTypeForPromiseOfAnyProp(obj: Obj): Promise<Obj["anyProp"]> {
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return Promise.resolve(obj.anyProp);
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}
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async function fIndexedTypeForExplicitPromiseOfAnyProp(obj: Obj): Promise<Obj["anyProp"]> {
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return Promise.resolve<Obj["anyProp"]>(obj.anyProp);
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}
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async function fGenericIndexedTypeForStringProp<TObj extends Obj>(obj: TObj): Promise<TObj["stringProp"]> {
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return obj.stringProp;
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}
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async function fGenericIndexedTypeForPromiseOfStringProp<TObj extends Obj>(obj: TObj): Promise<TObj["stringProp"]> {
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return Promise.resolve(obj.stringProp);
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}
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async function fGenericIndexedTypeForExplicitPromiseOfStringProp<TObj extends Obj>(obj: TObj): Promise<TObj["stringProp"]> {
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return Promise.resolve<TObj["stringProp"]>(obj.stringProp);
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}
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async function fGenericIndexedTypeForAnyProp<TObj extends Obj>(obj: TObj): Promise<TObj["anyProp"]> {
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return obj.anyProp;
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}
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async function fGenericIndexedTypeForPromiseOfAnyProp<TObj extends Obj>(obj: TObj): Promise<TObj["anyProp"]> {
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return Promise.resolve(obj.anyProp);
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}
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async function fGenericIndexedTypeForExplicitPromiseOfAnyProp<TObj extends Obj>(obj: TObj): Promise<TObj["anyProp"]> {
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return Promise.resolve<TObj["anyProp"]>(obj.anyProp);
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}
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async function fGenericIndexedTypeForKProp<TObj extends Obj, K extends keyof TObj>(obj: TObj, key: K): Promise<TObj[K]> {
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return obj[key];
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}
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async function fGenericIndexedTypeForPromiseOfKProp<TObj extends Obj, K extends keyof TObj>(obj: TObj, key: K): Promise<TObj[K]> {
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return Promise.resolve(obj[key]);
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}
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async function fGenericIndexedTypeForExplicitPromiseOfKProp<TObj extends Obj, K extends keyof TObj>(obj: TObj, key: K): Promise<TObj[K]> {
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return Promise.resolve<TObj[K]>(obj[key]);
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} |