webpack.config.js

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

module.exports = {
  entry: ['bootstrap-loader', './app/js/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" },
      { from: './app/img', to: 'img'},
    ]),
    new webpack.ProvidePlugin({
      $: "jquery",
      jQuery: "jquery",
      "window.jQuery": "jquery",
      Popper: "popper.js",
      Tether: "tether",
      "window.Tether": "tether",
      Alert: "exports-loader?Alert!bootstrap/js/dist/alert",
      Button: "exports-loader?Button!bootstrap/js/dist/button",
      Carousel: "exports-loader?Carousel!bootstrap/js/dist/carousel",
      Collapse: "exports-loader?Collapse!bootstrap/js/dist/collapse",
      Dropdown: "exports-loader?Dropdown!bootstrap/js/dist/dropdown",
      Modal: "exports-loader?Modal!bootstrap/js/dist/modal",
      Popover: "exports-loader?Popover!bootstrap/js/dist/popover",
      Scrollspy: "exports-loader?Scrollspy!bootstrap/js/dist/scrollspy",
      Tab: "exports-loader?Tab!bootstrap/js/dist/tab",
      Tooltip: "exports-loader?Tooltip!bootstrap/js/dist/tooltip",
      Util: "exports-loader?Util!bootstrap/js/dist/util",
    })
  ],
  module: {
    rules: [
      {
       test: /\.css$/,
       use: [ 'style-loader', 'css-loader' ]
      },
      {
          test: /\.(eot|svg|ttf|woff|woff2|otf)$/,
          use: 'file-loader?name=public/fonts/[name].[ext]'
      },
      { test: /\.png$/, use: 'file-loader' }
    ],
    loaders: [
      { test: /\.json$/, use: 'json-loader' },
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
        query: {
          presets: ['es2015'],
          plugins: ['transform-runtime']
        }
      }
    ]
  }
}