microsoft / microsoft/TypeScript
Explicit any type in for..in loop
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Description
For the reason of consistency, it should be possible to explicitly annotate the iterator variable at least with the "any" type in a for..in loop.
Edit from @sandersn: Fixes should apply to JSDoc too: https://github.com/microsoft/TypeScript/issues/43756, and perhaps allow annotations on for .. of too
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
The issue names no source files or tests. Start by locating the parser and checker paths for for..in iterator declarations, then review the related JSDoc issue #43756 and existing tests for loop-variable annotations. Done means explicit any is accepted consistently in the requested for..in syntax, with the JSDoc case addressed as specified.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100