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