webpack.config.js

const path = require('path');

module.exports = {
  mode: process.env.NODE_ENV,
  entry: path.resolve(__dirname, './client/src/index.js'),
  output: {
    publicPath: '/dist/',
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        query: {
          presets: ['@babel/env', '@babel/preset-react'],
        },
      },
      {
        test: /\.s?css/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ],
  },
  devServer: {
    host: 'localhost',
    port: 8080,
    historyApiFallback: true,
    inline: true,
    proxy: { "/": { target: 'http://localhost:3000', secure: false }
    },
  },
};