26 lines
615 B
TypeScript
26 lines
615 B
TypeScript
// lets you wait until it is uncorked by someone before running
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export default class DedupAwaiter<T> {
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private promise: Promise<T> | null;
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constructor(
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private func: () => Promise<T>
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) {}
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public async call(): Promise<T> {
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if (!this.promise) {
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let result: T | null = null;
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let promise = new Promise<T>(async (resolve) => {
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resolve(await this.func());
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});
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// This if statement could trigger if func is not async
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// typescript is missing some fun stuff going on here :)
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if (result) {
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return result;
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} else {
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this.promise = promise;
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}
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}
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return await this.promise;
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}
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}
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