formatjs/formatjs ? reverse-engineered prompt

Build me a working TypeScript monorepo for internationalization utilities like FormatJS, with the main focus on a React friendly message formatting library and the supporting helpers for dates, numbers, plural rules, lists, locale matching, and display names.

I want it set up so a developer can format messages, swap languages, and use the same core formatting across React and plain JavaScript. Include a small command line tool for extracting or checking messages, plus a simple docs site and example app so I can see it working. Make sure the code is organized as reusable packages, and that the important pieces are tested and easy to publish separately.

If you need to, look up the current docs online and follow the common behavior people expect from FormatJS style internationalization tools.