webpack.config.js

const HtmlWebPackPlugin = require('html-webpack-plugin');
const Dotenv = require('dotenv-webpack');
const path = require('path');

const APP_DIR = path.resolve(__dirname, 'src');

module.exports = {
  entry: ['babel-polyfill', `${APP_DIR}/index.jsx`],
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [{ loader: 'style-loader' }, { loader: 'css-loader' }],
      },
      {
        test: /\.js(x*)?$/,
        resolve: {
          extensions: ['.js', '.jsx'],
        },
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {},
          },
        ],
      },
    ],
  },
  devServer: {
    historyApiFallback: true,
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: './src/index.html',
      filename: './index.html',
    }),
    new Dotenv(),
  ],
};