feat: implement letter.lowercase and letter.uppercase

[ccjmne]

Pretty trivial implementation!

However, something is wonky in the changes to the typings tests I introduced in c2200a4...
The tests were broken by introducing lowercase and uppercase properties to letter, and when I tried reproducing a minimal example of it on typescriptlang.org, of course there, an Asdf<T> & { yes: 'no' } does extend Asdf<any>. I couldn't put my finger on what the fix should be.

There might be a better way to handle them through savvy typing of the extractRegExp function, but I couldn't figure it out myself. 🙇‍♀️

Resolves #37.

[what-the-diff]

• Added letter.lowercase and letter.uppercase to the inputs
• Updated tests for lowercase, uppercase and not versions of these new inputs

[danielroe]

The test issues you encountered are flagging that the type generation is broken at the moment.

(To be clear, this is the most difficult part of the PR for the reason you've encountered.)

We might consider rethinking the API. Maybe letter.any, letter.lowercase, letter.uppercase as three in parallel? wdyt @didavid61202

[didavid61202]

HI @danielroe, @ccjmne . I've made a PR #79 related to the type inferencing issue encountered in the PR.
If #79 is merged, we can remove the type casting in test file and merge this PR 👍

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[danielroe]

Thank you both! ❤️

[ccjmne]

This was really nice!
I should get off my butt and try to participate more in some open-source projects outside of Oktoberfest as well. 🤯

I learned some things, thought about some implementation details, read code that's not mine, discovered the Vite bundler, realised that pnpm is really getting popular...
All of that, by doing nearly nothing! 😂

Great experience 👍
Also, delightful interactions with you guys 😊

Cheers!

[didavid61202]

@ccjmne Thanks!
I'm also on the same track, trying to participate more in open-source projects, and have learned quite a lot from the best developers/maintainers like Daniel, Anthony, and Pooya Parsa (All from Nuxt team!).
And I will highly recommend checking out Nuxt repo and unjs repos if you haven't 👍

Thanks for your contribution! 💚

Cheers! 🍻