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export function isPromise <T = unknown> (value: T | Promise<T>): value is Promise<T> {
return value && typeof (value as Promise<T>).then === 'function'
}
export function isCatchable (value: any) {
return value && typeof value.catch === 'function'
}
export function timeoutPromise <T> (promise: Promise<T>, timeoutMs: number) {
let timer: ReturnType<typeof setTimeout>
return Promise.race([
promise,
new Promise((_res, rej) => {
timer = setTimeout(() => rej(new Error('Timeout')), timeoutMs)
})
]).finally(() => clearTimeout(timer))
}
export function promisify0<A> (func: (cb: (err: any, result: A) => void) => void): () => Promise<A> {
return function promisified (): Promise<A> {
return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
// eslint-disable-next-line no-useless-call
func.apply(null, [ (err: any, res: A) => err ? reject(err) : resolve(res) ])
})
}
}
// Thanks to https://gist.github.com/kumasento/617daa7e46f13ecdd9b2
export function promisify1<T, A> (func: (arg: T, cb: (err: any, result: A) => void) => void): (arg: T) => Promise<A> {
return function promisified (arg: T): Promise<A> {
return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
// eslint-disable-next-line no-useless-call
func.apply(null, [ arg, (err: any, res: A) => err ? reject(err) : resolve(res) ])
})
}
}
// eslint-disable-next-line max-len
export function promisify2<T, U, A> (func: (arg1: T, arg2: U, cb: (err: any, result: A) => void) => void): (arg1: T, arg2: U) => Promise<A> {
return function promisified (arg1: T, arg2: U): Promise<A> {
return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
// eslint-disable-next-line no-useless-call
func.apply(null, [ arg1, arg2, (err: any, res: A) => err ? reject(err) : resolve(res) ])
})
}
}
// eslint-disable-next-line max-len
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> {
return function promisified (arg1: T, arg2: U, arg3: V): Promise<A> {
return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
// eslint-disable-next-line no-useless-call
func.apply(null, [ arg1, arg2, arg3, (err: any, res: A) => err ? reject(err) : resolve(res) ])
})
}
}
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