Thanks for creating this! I had issues with vite and generating .d.ts files, but tsup has been working great!

The only thing I noticed with my React library are these errors:

ReferenceError: React is not defined

Adding import * as React from 'react'; at the top of each file fixes it.

But based on developit/microbundle#763 (comment), I was wondering if it'd be possible to do something similar like:

tsup --jsx 'React.createElement' --jsxImportSource react --globals react/jsx-runtime=jsx