webpack.config.js

const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
  entry: './app/javascripts/app.js',
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'app.js'
  },
  plugins: [
    // Copy our app's index.html to the build folder.
    new CopyWebpackPlugin([
      { from: './app/index.html', to: "index.html" }
    ])
  ],
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/,
        loader: 'url',
        query: {
          limit: 100,
          name: 'static/img/[name].[ext]?[hash:7]'
        },
        exclude: /node_modules/,
        include: path.resolve(__dirname, '../src')
      }, {
        test: /\.html$/,
        loader: "html"
      }
    ],
    loaders: [
      { test: /\.json$/, use: 'json-loader' },
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
        query: {
          presets: ['es2015'],
          plugins: ['transform-runtime']
        }
      },
      {
        test: /\.jpe?g$|\.ico$|\.gif$|\.png$|\.svg$|\.woff$|\.ttf$|\.wav$|\.mp3$/,
        loader: 'file-loader?name=[name].[ext]'  // <-- retain original file name
      }
    ]
  },
  devtool: 'inline-source-map'
}