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Awaitable q.push doesn't resolve when queue worker throws an error

See original GitHub issue

await q.push(task) is not safe for use for the moment because the promise returned by q.push never resolve nor reject if the queue worker throws an error. I understand that await q.push(task) cannot throw an error because of the backward compatibility of this method and its optional callback parameter (the push and forget feature). A q.asyncPush(task) method that rejects its promise shouldn’t be feasible ?

You can show the problem with this code (in node or browser without the require):

const async = require('async');
let pushResult;

(async () => {
	const q = async.queue(async (task) => {
		throw new Error('Bad thing');

	try {
		pushResult = q.push({some: 'data'});
		await pushResult;
		console.log('Error not catched');
	} catch (e) {
		console.log('Error catched');

setTimeout(() => {
}, 1000);

_Originally posted by @darksabrefr in

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:6

github_iconTop GitHub Comments

aearlycommented, Jun 13, 2019

I like the asyncPush idea.

aearlycommented, Jun 6, 2019

I’m considering making q.push() resolve with the error object. Would that be sufficient? I really don’t wan’t to give unhandledRejections to the vast majority of queue users.

Read more comments on GitHub >

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