microsoft / microsoft/TypeScript
Confusing error message for labels used before definition
Open
Nobody has claimed this yet.
Domain: Error Messages
Effort: Moderate
Experience Enhancement
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Description
The following gives me an unexpected "TS1007: Jump target cannot cross function boundary error" in TS 3.3.33333
function foo() {
for (let i = 0; i < 10; i++) {
console.log(`${i}`);
continue loopend;
}
loopend:
console.log('end of loop');
}
Further investigation... you can jump to the start of the loop, so the error I would argue is that the error message is confusing.
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
Reproduce the example from the issue in the TypeScript Playground or with TypeScript 3.3.33333, then trace the diagnostic reported as TS1007. Compare the reported jump-target error with the demonstrated label behavior; done means the diagnostic accurately explains this case or points to the actual restriction.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 55/100