webpack.config.js

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

module.exports = {
  mode: process.env.NODE_ENV,
  entry: './client/index.js',
  output: {
    path: path.resolve(__dirname, 'public'),
    filename: 'bundle.js',
  },
  devServer: {
    port: '8080',
    static: ['./public'],
    open: true,
    hot: true,
    liveReload: true,
    proxy: {
      '/user': 'http://localhost:3000',
      '/my-snaps': 'http://localhost:3000',
      '/settings': 'http://localhost:3000',
      '/signup': 'http://localhost:3000'
    },
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/, //kind of file extension this rule should look for and apply in test
        exclude: /node_modules/, //folder to be excluded
        use: {
          loader: 'babel-loader', //loader which we are going to use
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
      {
        test: /\.(png|jpe?g|gif)$/i,
        use: [
          {
            loader: 'file-loader',
          },
        ],
      },
      {
        test: /.(css|scss)$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './template.html',
    }),
    new Dotenv(),
  ],
};