Declare relative-element under React.JSX to fix React 19 compatibility

[eramdam]

Fixes #304

I had to add a @ts-expect-error comment since otherwise the typechecker would complain about missing react as a dependency.

[keithamus]

@github/primer you'll need to integrate this to check whether or not this is viable for the monolith. Please do not merge before checking this, otherwise we'll have to revert.

[keithamus]

@eramdam looks like this isn't quite passing the CI checks. Does tsc --noEmit pass locally for you?

[eramdam]

@eramdam looks like this isn't quite passing the CI checks. Does tsc --noEmit pass locally for you?

Oops, you're right, it doesn't 🙈 I wanted to avoid it but it looks like the only clean way of fixing the issue was to add @types/react as a peer dependency so I did that.

[camertron]

Hey @eramdam, thanks for looking into this. I'm hesitant to merge React-specific code into this project, considering it really has nothing to do with React. Could we instead put the React code into a separate .d.ts file and ask that clients add it to their tsconfig.json?

[keithamus]

I think this looks okay from a library perspective. I dislike that there’s react specific idioms too, but react is always messy to integrate with so… 🤷‍♂️

@camertron lets try integrating this with PVC and see if there are any issues. AIUI this shouldn’t cause too much friction within PVC, but it might and at that point we’ll need to look at other solutions. My hope is this is a transparent change to non-react projects like PVC, and doesn’t pull in additional dependencies.