chore: add TypeScript as a dependency #2588
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This PR does NOT migrate the codebase to TypeScript nor indicates intent to do so in the future. What it does is simply installs TypeScript, so that developer experience (when writing JavaScript!) can be improved.
On top of that, this makes
yarn tsc
command available. At the moment, it still produces a lot of errors, so it's pretty useless, but as #2587 (and the PRs that come after that) gets merged, slowly but surely we'll have increased type safety.Eventually, we could consider having type checking as a CI step to ensure better quality. Still, writing JavaScript!