25 lines
781 B
TypeScript
25 lines
781 B
TypeScript
/**
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* A promise that can be resolved or rejected from outside.
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*/
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export type ControllablePromise<T = unknown> = Promise<T> & {
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resolve(val: T): void
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reject(err?: unknown): void
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}
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/**
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* Creates a promise that can be resolved or rejected from outside.
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*/
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export function createControllablePromise<T = unknown>(): ControllablePromise<T> {
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let _resolve: ControllablePromise<T>['resolve']
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let _reject: ControllablePromise<T>['reject']
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const promise = new Promise<T>((resolve, reject) => {
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_resolve = resolve
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_reject = reject
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})
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// ts doesn't like this, but it's fine
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;(promise as ControllablePromise<T>).resolve = _resolve!
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;(promise as ControllablePromise<T>).reject = _reject!
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return promise as ControllablePromise<T>
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}
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