forked from Fediversity/fediversity.eu
52 lines
1 KiB
JavaScript
52 lines
1 KiB
JavaScript
|
/*! run-parallel. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */
|
||
|
|
module.exports = runParallel
|
||
|
|
|
||
|
|
const queueMicrotask = require('queue-microtask')
|
||
|
|
|
||
|
|
function runParallel (tasks, cb) {
|
||
|
|
let results, pending, keys
|
||
|
|
let isSync = true
|
||
|
|
|
||
|
|
if (Array.isArray(tasks)) {
|
||
|
|
results = []
|
||
|
|
pending = tasks.length
|
||
|
|
} else {
|
||
|
|
keys = Object.keys(tasks)
|
||
|
|
results = {}
|
||
|
|
pending = keys.length
|
||
|
|
}
|
||
|
|
|
||
|
|
function done (err) {
|
||
|
|
function end () {
|
||
|
|
if (cb) cb(err, results)
|
||
|
|
cb = null
|
||
|
|
}
|
||
|
|
if (isSync) queueMicrotask(end)
|
||
|
|
else end()
|
||
|
|
}
|
||
|
|
|
||
|
|
function each (i, err, result) {
|
||
|
|
results[i] = result
|
||
|
|
if (--pending === 0 || err) {
|
||
|
|
done(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!pending) {
|
||
|
|
// empty
|
||
|
|
done(null)
|
||
|
|
} else if (keys) {
|
||
|
|
// object
|
||
|
|
keys.forEach(function (key) {
|
||
|
|
tasks[key](function (err, result) { each(key, err, result) })
|
||
|
|
})
|
||
|
|
} else {
|
||
|
|
// array
|
||
|
|
tasks.forEach(function (task, i) {
|
||
|
|
task(function (err, result) { each(i, err, result) })
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
isSync = false
|
||
|
|
}
|