webpack.prod.js

const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const merge = require('webpack-merge');
const common = require('./webpack.common.js');
const webpack = require('webpack');

module.exports = merge(common, {
    plugins: [
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': '"production"'
        }),
        new webpack.optimize.UglifyJsPlugin({
            mangle: true,
            compress: {
                warnings: false, // Suppress uglification warnings
                pure_getters: true,
                unsafe: true,
                unsafe_comps: true,
                screw_ie8: true
            },
            output: {
                comments: false,
            },
            exclude: [/\.min\.js$/gi] // skip pre-minified libs
        }),
        new webpack.IgnorePlugin(/^\.\/locale$/, [/moment$/])
    ]
});