[TS] Add TypeScript unit testing pipeline

Motivation

In the last few weeks, I’ve noticed a lot of issues outlining discrepancies between actual component bahaviour (outlined in .js files) and the types defined in index.d.ts files. I propose either migrating existing tests to .ts files, or adding TypeScript-specific tests alongside existing tests to help improve the Grommet TypeScript experience for users.

I’d like this issue to be a thread for initial discussion/proposals, and if/when we decide on a way forward I’ll log a separate issue to track migration/implementation progress.

Related Issues

Here is a list ot the types of TypeScript issues that are being raised recently:

• Missing/incorrect typings:
  • #5108
  • #5107
  • #5117
• Generics for prop types
  • #5087
  • #5041
• Storybook TS
  • #5121

[alexmirrington]

@jcfilben I’ve just created a new PR and closed the old one, as the dependencies for the old PR were quite a few months out of date. All technical details for reviewers can be found in the description of the new PR.

[jcfilben]

Hi @alexmirrington sorry for the long wait on this. Thanks for your patience and following up on the issue. I think typescript testing would be a beneficial addition to grommet. @ericsoderberghp do you know if there was a reason we were holding off on this or has it just been waiting for someone to take a stab at reviewing it?