webpack.config.js

const path = require('path');
const HtmlWebPackPlugin = require('html-webpack-plugin');
module.exports = {
  mode: process.env.NODE_ENV,
  entry: './client/index.js',
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.jsx?/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        query: {
          presets: ['@babel/env', '@babel/react']
        }
      },
      {
        test: /\.s?css/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.(gif|png|jpe?g|svg)$/i,
        use: [
          'file-loader',
          {
            loader: 'image-webpack-loader',
            options: {
              bypassOnDebug: true, // webpack@1.x
              disable: true // webpack@2.x and newer
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: './client/index.html',
      filename: './index.html'
    })
  ],
  devServer: {
    publicPath: '/',
    port: 8080,
    proxy: {
      '/api/*': {
        target: 'http://localhost:3000',
        secure: false
      },
      '/users/*': {
        target: 'http://localhost:3000',
        secure: false
      },
      '/msg/*': {
        target: 'http://localhost:3000',
        secure: false
      }
    },
    historyApiFallback: true
  }
};