A better
Promise.race()
Improvements:
- Fixes the silly behavior of
Promise.race()returning a forever pending promise when supplied an empty iterable, which could create some really hard to debug problems.Promise.race()returns the first promise to fulfill or reject. Check outp-anyif you like to get the first promise to fulfill. - Supports aborting promises using
AbortSignal.
npm install p-raceimport pRace from 'p-race';
Promise.race([]);
// Returns a forever pending promise…
pRace([]);
//=> [RangeError: Expected the input to contain at least one item]Type: Iterable<Promise | unknown>
Type: signal => Iterable<Promise | unknown>
Type: AbortSignal
You can pass the signal to each iterable's element to abort remaining promises when resolve the first promise.
Requires Node.js 16 or later.
import pRace from 'p-race';
pRace(signal => [
fetch('/api', {signal}),
setTimeout(10, {signal}),
]);
// Remaining promises other than first one will be aborted.