We read every piece of feedback, and take your input very seriously.
Include my email address so I can be contactedgetElementTypeOfArrayType returns undefined if t is not an array type. Use isArrayType or isArrayLikeType if that's all you need to know.
Probably you return undefined instead of a new or existin node, but look at src/compiler/transformers/ts.ts. Deleting type annotations is its main job.
News
Debugging TypeScript
Contributing to TypeScript
Building Tools for TypeScript
FAQs
The Main Repo