microsoft / microsoft/TypeScript
JS typedef merged with default modified class errors strangely
Open
Nobody has claimed this yet.
Bug
Domain: Error Messages
Domain: JavaScript
- Dominant language
- Go
- Stars
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- Forks
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- Avg merge
- 2d 4h
- Merged PRs (30d)
- 132
Description
TypeScript Version: 3.4.0-dev.201xxxxx
Search Terms:
Code
export default class C {};
/**
* @typedef {string | number} default
*/
Expected behavior:
An coherent error on attempting to merge a class and a typedef.
Actual behavior:
Duplicate identifier 'default'.
and
Duplicate identifier 'C'.
on the default type alias and class C, respectively.
cc @sandersn
Contributor guide
First steps
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- Open a pull request that references the issue number.
Research direction
No source files or tests are named. Start by reproducing the supplied JavaScript and JSDoc typedef with the referenced TypeScript 3.4 development version, then trace how the compiler reports the class and typedef merge. Done means the invalid merge produces one coherent diagnostic rather than the reported duplicate identifiers.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100