webpack.common.js

const webpack = require('webpack');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
    entry: {
        app: './src/app.js',
        vender: [ 
            'react', 'react-dom', 'react-router-dom', 
            'axios', 'prop-types' ]
    },
    output: {
        path: path.resolve(__dirname, './docs/'),
        filename: "js/[name].[chunkhash].js"
    },
    module: {
        rules: [
            {
                test: /\.jsx?$/,
                exclude: path.resolve(__dirname, 'node_modules'),
                loader: 'babel-loader',
                query: {
                    plugins: [
                        'transform-decorators-legacy'
                    ]
                }
            },
            {
                test: /\.s?css$/,
                exclude: path.resolve(__dirname, "node_modules"),
                use: ExtractTextPlugin.extract({
                    fallback: 'style-loader',
                    use: [{
                        loader: 'css-loader',
                        options: {
                            sourceMap: true
                        }
                    },'sass-loader'],
                })
            },
            {
                test: /\.(gif|png|jpe?g|svg)$/i,
                use: [
                  'file-loader',
                  {
                    loader: 'image-webpack-loader',
                    options: {
                      bypassOnDebug: true,
                    },
                  },
                ],
              }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({template: path.resolve(__dirname, 'src/index.html')}),
        new webpack.optimize.CommonsChunkPlugin({
            name: 'manifest',
            filename: "manifest.js",
            chunks: ['vender']
        }),
        new ExtractTextPlugin({
            filename: 'styles/style.css'
        }),
        new CopyWebpackPlugin([{
            from: 'src/assets',
            to: path.resolve(__dirname, './docs/assets')
        }]), 
    ]
}