microsoft / microsoft/TypeScript
Misleading error message for duplicate CLI flags
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Experience Enhancement
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Description
Bug Report
🔎 Search Terms
tsc multiple flag options cli
🕗 Version & Regression Information
- This is the behavior in every version I tried, and I reviewed the FAQ for entries about CLI option parsing
⏯ Playground Link
N/A
💻 Code
Any of:
tsc -b -b
tsc -b --build
tsc -b --clean --build
🙁 Actual behavior
tsc -b -b
error TS5072: Unknown build option '-b'.
🙂 Expected behavior
Something indicating the flag was provided twice, not that it's unknown?
tsc -b -b
error TS5072: Duplicate build option '-b' provided.
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 tracing TypeScript's CLI option parsing using the reported commands: tsc -b -b, tsc -b --build, and tsc -b --clean --build. Compare the current diagnostic with the expected duplicate-option wording; done means duplicate build flags are reported as duplicates rather than unknown options.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- cli
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100