20 lines
524 B
TypeScript
20 lines
524 B
TypeScript
// @target: es2015
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// https://github.com/Microsoft/TypeScript/issues/18186
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class AsyncEnumeratorDone { };
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interface IAsyncEnumerator<T> {
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next1(): Promise<T | AsyncEnumeratorDone>;
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next2(): Promise<T> | Promise<AsyncEnumeratorDone>;
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next3(): Promise<T | {}>;
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next4(): Promise<T | { x: string }>;
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}
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async function main() {
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const x: IAsyncEnumerator<number> = null;
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let a = await x.next1();
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let b = await x.next2();
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let c = await x.next3();
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let d = await x.next4();
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}
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