react-app-rewired-preact/examples/configurable-overrides/package.json

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

{
  "name": "configurable-overrides",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.2.0",
    "react-app-rewired": "file:react-app-rewired-1.4.1.tgz",
    "react-dom": "^16.2.0",
    "react-scripts": "1.1.0"
  },
  "scripts": {
    "start": "react-app-rewired start --config-overrides ./custom-overides"
  },
  "devDependencies": {
    "babel-plugin-transform-decorators-legacy": "^1.3.4"
  }
}