webpack.development.config.js

const { join } = require('path');
const merge = require('webpack-merge');

module.exports = merge(require('./webpack.base.config'), {
  devtool: 'cheap-module-source-map',
  module: {
    rules: [
    ...
    ],
  },

  plugins: [
  ...
  ],

  devServer: {
    host: '0.0.0.0',
    port: 3001,
    contentBase: join(__dirname, '../build'),
    historyApiFallback: false,
    hot: true,
  },
});