react-app-rewired-preact/scripts/build.js

Tweak the create-react-app webpack config(s) without using 'eject' and without creating a fork of the react-scripts

process.env.NODE_ENV = 'production';

const paths = require('./utils/paths');
const overrides = require('../config-overrides');
const webpackConfigPath = paths.scriptVersion + "/config/webpack.config.prod";

// load original config
const webpackConfig = require(webpackConfigPath);
// override config in memory
require.cache[require.resolve(webpackConfigPath)].exports =
  overrides.webpack(webpackConfig, process.env.NODE_ENV);
// run original script
require(paths.scriptVersion + '/scripts/build');