Migrate to Typescript

[pierpo]

I just migrated the whole codebase to Typescript.

Benefits

• Typescript is way more adopted right now and people will be more likely to contribute
• Flow was quite a struggle when it came to upgrading versions. It should be easier with Typescript now.
• DevX is probably better (I haven't checked recent flow versions though)
• .d.ts generation is now automated

Drawbacks

• Because of the automatic .d.ts generation, this is dropping flow-types support.

TODO

• [x] It should work, but I need to properly test on an external project that everything still works (runtime + type definitions)

[pierpo]

Everything works! :rocket:

[ThiloAschebrock]

@pierpo Would you mind releasing a new version that includes these changes? With @types/react for React 18 children are no longer automatically included, which causes issue with react-archer. However, this PR already includes the necessary adjustments to work with the updated react types.

[pierpo]

Sure, will do!

[pierpo]

Done. Thanks for asking for it. I was procrastinating :smile: (and also wondering "major or minor?" but since there's been a drop in flow support, it can be considered a major upgrade)

[ThiloAschebrock]

Thank you! @pierpo