FRONTEND.md

https://www.freecodecamp.org/news/how-to-use-reactjs-with-webpack-4-babel-7-and-material-design-ff754586f618/

https://zh-hant.reactjs.org/docs/add-react-to-a-website.html

npm run-script build

npx babel --watch src/main/js --out-dir . --presets react-app/prod