microsoft / microsoft/TypeScript
API `getSemanticDiagnostics` reports wrong error for code extends interface in namespace
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Description
🔎 Search Terms
"getSemanticDiagnostics namespace"
🕗 Version & Regression Information
- I was unable to test this on prior versions because _______
⏯ Playground Link
No response
💻 Code
namespace A {
export interface C {}
}
interface B extends A.C {
}
🙁 Actual behavior
messageText: "Cannot extend an interface 'A.C'. Did you mean 'implements'?",
category: 1,
code: 2689,
reportsUnnecessary: undefined,
reportsDeprecated: undefined
🙂 Expected behavior
No error.
Additional information about the issue
No response
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 namespace example through the getSemanticDiagnostics API and trace the semantic diagnostic that reports error 2689. The fix is complete when this code produces no diagnostic, with a regression test covering an interface extending A.C; the issue does not name a repository file or test path.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100