add typings and upgrade tooling

[jantimon]

I haven't changed the code of the source files, but I have added typings to make the package easier to use.

In addition to the typings, I've made a few other changes that I believe could benefit the project. Specifically, I've switched out Webpack for tsup and Parcel for Vite to reduce dependencies and optimize the generated assets.

Additionally, I've upgraded the project's eslint to the latest version, which has helped to resolve a number of vulnerabilities 52 vulnerabilities (2 low, 21 moderate, 23 high, 6 critical).

I hope removing the flow part from the eslint config is okay (I didn't find any flow typings in the source files).

I bumped to 4.0.0 as I added a typings and module entry to package.json.

Please let me know what you think :)

[pstadler]

This is incredible. Thanks a lot for the effort! 🍻

[jantimon]

@pstadler thanks for taking the time to review this quote huge pr 👍

looks like dropping webpack worked well:

https://bundlephobia.com/package/[email protected]