67 lines
1.4 KiB
TypeScript
67 lines
1.4 KiB
TypeScript
import 'typings-global'
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import * as util from 'util'
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export interface IResolve<T> {
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(value?: T | Promise<T>): void
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}
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export interface IReject {
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(reason?: any): void
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}
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export type TDeferredStatus = 'pending' | 'fulfilled' | 'rejected'
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export class Deferred<T> {
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promise: Promise<T>
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resolve: IResolve<T>
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reject: IReject
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status: TDeferredStatus
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constructor () {
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this.promise = new Promise<T>((resolve, reject) => {
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this.resolve = resolve
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this.reject = reject
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this.status = 'pending'
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})
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}
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}
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export let defer = <T>() => {
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return new Deferred<T>()
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}
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/**
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* Creates a new resolved promise for the provided value.
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*/
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export let resolvedPromise = <T>(value?: T): Promise<T> => {
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return Promise.resolve(value)
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}
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/**
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* Creates a new rejected promise for the provided reason.
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*/
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export let rejectedPromise = (err) => {
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return Promise.reject(err)
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}
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export let promisify = util.promisify
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// polyfill
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if (!promisify) {
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promisify = require('util.promisify')
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}
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export let map = async <T> (inputArg: T[],functionArg) => {
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let promisifedFunction = promisify(functionArg)
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let promiseArray: Promise<any>[] = []
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let resultArray = []
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for (let item of inputArg) {
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let promise: Promise<any> = promisifedFunction(item)
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promiseArray.push(promise)
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promise.then(x => {
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resultArray.push(x)
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})
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}
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await Promise.all(promiseArray)
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return resultArray
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}
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