webpack.config.dev.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  mode: 'development',
  entry: ['babel-polyfill', './src/index.js'],
  output: {
    filename: 'bundle.js',
    publicPath: '/',
  },
  devtool: 'eval-source-map',
  module: {
    rules: [
      {
        test: /\.js?$/,
        use: ['babel-loader'],
        exclude: /node_modules/,
      },
      {
        test: /\.(png|svg|jpg|gif|woff2|otf)$/,
        use: ['file-loader'],
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify('development'),
      },
    }),
    new webpack.HotModuleReplacementPlugin(),
    new HtmlWebpackPlugin({
      alwaysWriteToDisk: false,
      inject: false,
      template: require('html-webpack-template'),
      appMountId: 'root',
      title: 'Collections viewer',
      mobile: true,
    }),
  ],
  devServer: {
    host: 'localhost',
    port: 3000,
    historyApiFallback: true,
    hot: true,
    contentBase: path.join(__dirname, 'src'),
  },
};