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fix(uglify/Runner): cpus length in a chroot environment (os.cpus()) #341

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merged 1 commit into from Aug 14, 2018
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fix(uglify/Runner): cpus length in a chroot environment (os.cpus()) #341

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5 changes: 4 additions & 1 deletion src/uglify/Runner.js
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Expand Up @@ -16,7 +16,10 @@ export default class Runner {
constructor(options = {}) {
const { cache, parallel } = options;
this.cacheDir = cache === true ? findCacheDir({ name: 'uglifyjs-webpack-plugin' }) : cache;
this.maxConcurrentWorkers = parallel === true ? os.cpus().length - 1 : Math.min(Number(parallel) || 0, os.cpus().length - 1);
// In some cases cpus() returns undefined
// https://github.com/nodejs/node/issues/19022
const cpus = (os.cpus() || { length: 1 });
this.maxConcurrentWorkers = parallel === true ? cpus.length - 1 : Math.min(Number(parallel) || 0, cpus.length - 1);
}

runTasks(tasks, callback) {
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