Source for the regexfree website:

https://regexfree.k55.io/

How do you build?

npm i
npx tsc regexfree.ts

Copy/paste the contents of regexfree.js into the second <script>...</script> tags in index.html.

Why isn't there a build script?

I'm lazy.

Why is everything in one file?

I heard there was a perf advantage. It also makes the file simple to download and use offline, I suppose.

You should support my use case

Sure, open an issue.