13 lines
463 B
TypeScript
13 lines
463 B
TypeScript
// @target: esnext
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// GH: https://github.com/microsoft/TypeScript/issues/33239
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class ConstantIterator<T> implements AsyncIterator<T, undefined, T | undefined> {
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constructor(private constant: T) {
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}
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async next(value?: T): Promise<IteratorResult<T>> {
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if (value != null) {
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throw new Error("ConstantIterator.prototype.next may not take any values");
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}
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return { value: this.constant, done: false };
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}
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} |