These days you can run TypeScript files as-is (type stripping) for testing in many runtimes, and for bundling, most bundlers support using a ts file as the entry point directly.

yep! However this is a website I made for hosting my own notes in the browser browser (sorry for the load times, no bundler so each file is a seperate request)

https://akst.io/vis/20250601-complex-geo/?app=unsw.2102.01-1

That said, when I write tests, I write them in Typescript for that reason.