Jon Staab
28 lines
663 B
TypeScript
28 lines
663 B
TypeScript
export type CustomPromise<T, E> = Promise<T> & {
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__errorType: E
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}
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export function makePromise<T, E>(
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executor: (
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resolve: (value: T | PromiseLike<T>) => void,
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reject: (reason: E) => void
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) => void
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): CustomPromise<T, E> {
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return new Promise(executor) as CustomPromise<T, E>
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}
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export type Deferred<T, E = T> = CustomPromise<T, E> & {
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resolve: (arg: T) => void
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reject: (arg: E) => void
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}
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export const defer = <T, E = T>(): Deferred<T, E> => {
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let resolve, reject
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const p = makePromise((resolve_, reject_) => {
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resolve = resolve_
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reject = reject_
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})
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return (Object.assign(p, {resolve, reject}) as unknown) as Deferred<T, E>
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}
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