shared/core-utils/common/promises.ts

   1 export function isPromise <T = unknown> (value: T | Promise<T>): value is Promise<T> {
   2   return value && typeof (value as Promise<T>).then === 'function'
   3 }
   4
   5 export function isCatchable (value: any) {
   6   return value && typeof value.catch === 'function'
   7 }
   8
   9 export function timeoutPromise <T> (promise: Promise<T>, timeoutMs: number) {
  10   let timer: ReturnType<typeof setTimeout>
  11
  12   return Promise.race([
  13     promise,
  14
  15     new Promise((_res, rej) => {
  16       timer = setTimeout(() => rej(new Error('Timeout')), timeoutMs)
  17     })
  18   ]).finally(() => clearTimeout(timer))
  19 }
  20
  21 export function promisify0<A> (func: (cb: (err: any, result: A) => void) => void): () => Promise<A> {
  22   return function promisified (): Promise<A> {
  23     return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
  24       // eslint-disable-next-line no-useless-call
  25       func.apply(null, [ (err: any, res: A) => err ? reject(err) : resolve(res) ])
  26     })
  27   }
  28 }
  29
  30 // Thanks to https://gist.github.com/kumasento/617daa7e46f13ecdd9b2
  31 export function promisify1<T, A> (func: (arg: T, cb: (err: any, result: A) => void) => void): (arg: T) => Promise<A> {
  32   return function promisified (arg: T): Promise<A> {
  33     return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
  34       // eslint-disable-next-line no-useless-call
  35       func.apply(null, [ arg, (err: any, res: A) => err ? reject(err) : resolve(res) ])
  36     })
  37   }
  38 }
  39
  40 // eslint-disable-next-line max-len
  41 export function promisify2<T, U, A> (func: (arg1: T, arg2: U, cb: (err: any, result: A) => void) => void): (arg1: T, arg2: U) => Promise<A> {
  42   return function promisified (arg1: T, arg2: U): Promise<A> {
  43     return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
  44       // eslint-disable-next-line no-useless-call
  45       func.apply(null, [ arg1, arg2, (err: any, res: A) => err ? reject(err) : resolve(res) ])
  46     })
  47   }
  48 }
  49
  50 // eslint-disable-next-line max-len
  51 export function promisify3<T, U, V, A> (func: (arg1: T, arg2: U, arg3: V, cb: (err: any, result: A) => void) => void): (arg1: T, arg2: U, arg3: V) => Promise<A> {
  52   return function promisified (arg1: T, arg2: U, arg3: V): Promise<A> {
  53     return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
  54       // eslint-disable-next-line no-useless-call
  55       func.apply(null, [ arg1, arg2, arg3, (err: any, res: A) => err ? reject(err) : resolve(res) ])
  56     })
  57   }
  58 }