microsoft / microsoft/TypeScript
numeric literal types disrespect arithmetics
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Description
declare var a : -1 | 0 | 1;
a = -a; // <-- problem
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
Start by reproducing the minimal example in the issue and tracing how the TypeScript type checker handles numeric literal types and unary arithmetic. No file or test is named; done should include a decided and tested behavior for assigning the negated value to the declared literal union.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100