JavaScript CSS
Latest commit 5445804 Feb 13, 2017 @roman01la bump to v2.1.4


Google Closure Compiler plugin for Webpack

Webpack Closure Compiler Plugin

Table of Contents

Why use Closure Compiler instead of UglifyJS?

Closure Compiler is the most advanced JavaScript optimization tool. It generates smallest bundle and emits efficient JavaScript code by doing whole program analysis and optimization, removing closures and inlining function calls, as well as tree-shaking for AMD, CommonJS and ES2015 modules.


npm i -D webpack-closure-compiler



compiler: <Object>

A hash of options to pass to google-closure-compiler.

jsCompiler: <Boolean>

Use pure JavaScript version of Closure Compiler (no Java dependency). Note that compilation time will be around 2x slower. Default is false. concurrency and jsCompiler options are mutually exclusive.

concurrency: <Number>

The maximum number of compiler instances to run in parallel, defaults to 1. concurrency and jsCompiler options are mutually exclusive.

test: <RegExp>

Process only files which filename satisfies specified RegExp, defaults to /\.js($|\?)/i.


import path from 'path';
import ClosureCompilerPlugin from 'webpack-closure-compiler';

module.exports = {
    entry: [
        path.join(__dirname, 'app.js')
    module: {
        loaders: [{
            test: /\.js$/, exclude: /node_modules/,
            loaders: ['babel-loader?optional=runtime&stage=0&cacheDirectory']
    output: {
        path: path.join(__dirname, '/'),
        filename: 'app.min.js'
    plugins: [
        new ClosureCompilerPlugin({
          compiler: {
            language_in: 'ECMASCRIPT6',
            language_out: 'ECMASCRIPT5',
            compilation_level: 'ADVANCED'
          concurrency: 3,


If you've spotted a bug, please, open an issue, and after discussion submit a pull request with a bug fix. If you would like to add a feature or change existing behaviour, open an issue and tell about what exactly you want to change/add.