webpack.config.js

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

const SRC_DIR = path.join(__dirname, '/client/src');
const DIST_DIR = path.join(__dirname, '/client/dist');

module.exports = {
  entry: path.join(SRC_DIR, 'index.jsx'),
  output: {
    path: DIST_DIR,
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
      {
        test: /\.css$/i,
        include: path.resolve(__dirname, 'src/css'),
        use: ['style-loader', 'css-loader', 'postcss-loader'],
      },
      {
        test: /\.(png|jp(e*)g|svg|gif)$/,
        use: ['file-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: 'Webpack Output',
      template: path.resolve(__dirname, '/templates/template.html'),
    }),
    new webpack.DefinePlugin({
      'process.env': {
        AUTH_SECRET: JSON.stringify(process.env.AUTH_SECRET),
      },
    }),
  ],
  resolve: {
    alias: {
      Components: path.resolve(__dirname, '/client/src/components/'),
      Assets: path.resolve(__dirname, '/client/src/assets/'),
    },
    extensions: ['', '.js', '.jsx'],
  },
};