Run an array of functions in parallel, wait to finish when one errors. Similar to run-parallel and run-parallel-limit which return as soon as the first function errors, while this waits for functions that already started. Useful to ensure that once the final callback is called, any resources created by the functions have been cleaned up.
const parallel = require('run-parallel-settled')
const tasks = [
function one (next) {
next(new Error('failed'))
},
function two (next) {
setTimeout(function () {
console.log('wait for me')
next(null, 123)
}, 1e3)
},
function three (next) {
next(new Error('also failed'))
}
]
parallel(tasks, 3, function (err, results) {
if (err) throw err
})This will wait for function two, then throw a combined error from one and three:
$ node example.js
wait for me
/examples/example.js:19
if (err) throw err
^
Error: failed
at Array.one (/examples/example.js:5:10)
at parallel (/examples/node_modules/run-parallel-settled/index.js:27:13)
at ..
Error: also failed
at Array.three (/examples/example.js:14:10)
at parallel (/examples/node_modules/run-parallel-settled/index.js:27:13)
at ..
Run the functions in the tasks array, with a maximum of limit functions executing in parallel. The limit argument defaults to Infinity i.e. no limit. The callback function with signature callback(err, results) will be called once all functions have finished without error, or once one of them errors and all functions that were started have finished.
With npm do:
npm install run-parallel-settled
MIT © 2020-present Vincent Weevers