webpack.prod.js

const merge = require('webpack-merge');
const common = require('./webpack.common');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const webpack = require('webpack');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const path = require('path');

module.exports = merge(common, {
    devtool: 'source-map',
    module: {
        rules: [
            {
                test: /\.scss$/,
                use: ExtractTextPlugin.extract({
                    use: [{
                        loader: "css-loader",
                        options: {
                            sourceMap: false,
                            minimize: true
                        }
                    }, {
                        loader: "postcss-loader",
                        options: {
                            sourceMap: false,
                            plugins: function () {
                                return [
                                    require('precss'),
                                    require('autoprefixer')
                                ];
                            }
                        }
                    }, {
                        loader: "sass-loader",
                        options: {
                            sourceMap: false
                        }
                    }]
                })
            }
        ]
    },
    plugins: [
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify('production')
        }),
        new UglifyJsPlugin({
            sourceMap: true
        }),
        new CleanWebpackPlugin(path.join(__dirname, 'dist'))
    ]
});