webpack.config.dev.js

const webpack = require('webpack');
const path = require('path');
// import ExtractTextPlugin from 'extract-text-webpack-plugin';

module.exports = {
  devtool: 'eval-source-map',
  entry: [
    // 'eventsource-polyfill', // necessary for hot reloading with IE
    'webpack-hot-middleware/client?reload=true', // note that it reloads the page if hot module reloading fails.
    path.resolve(__dirname, 'src/index'),
  ],
  target: 'web',
  output: {
    path: `${__dirname}/dist`, // Note: Physical files are only output by the production build task `npm run build`.
    publicPath: '/',
    filename: 'bundle.js',
  },
  resolve: {
    extensions: ['.js', '.css', '.json'],
  },
  devServer: {
    contentBase: path.resolve(__dirname, 'src'),
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
  ],
  module: {
    rules: [
      { test: /\.js$/, include: path.join(__dirname, 'src'), loaders: ['babel-loader'] },
      {
        test: /\.css$/,
        use: ['style-loader', {
          loader: 'css-loader',
          options: {
            modules: true,
            sourceMap: true,
            importLoaders: 1,
            localIdentName: '[name]--[local]--[hash:base64:8]',
          },
        },
          'postcss-loader',
        ],
      },
      { test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: 'file-loader' },
      { test: /\.(woff|woff2)$/, loader: 'url?prefix=font/&limit=5000' },
      { test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: 'url?limit=10000&mimetype=application/octet-stream' },
      { test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: 'url?limit=10000&mimetype=image/svg+xml' },
    ],
  },
};