[heft] `The TypeScript compiler version 5.9.3 is newer than the latest version that was tested with Heft (5.8); it may not work correctly.`
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 55/100
- Issue type
- Bug
- Clarity
- Clearly specified
- Activity status
- Stale
- Tech stack
- typescript
- Domain
- build-system
Research direction
Start in heft-plugins/heft-typescript-plugin/src/loadTypeScriptTool.ts, where NEWEST_SUPPORTED_TS_MINOR_VERSION is defined. Update the supported TypeScript version, then run Rush commands with TypeScript 5.9.3 and confirm the compatibility warning is no longer emitted.
Written by the indexing model from the issue text.
Description
Summary
The NEWEST_SUPPORTED_TS_MINOR_VERSION constant is still set to 8. TypeScript 5.9 was released on Aug 1, 2025. Despite this and the warnings emitted, everything seems to be working as expected.
Repro steps
- Install TypeScript 5.9.3 and run rush commands.
- See:
The TypeScript compiler version 5.9.3 is newer than the latest version that was tested with Heft (5.8); it may not work correctly.
Expected result: No warnings about TypeScript 5.9.3 being incompatible.
Actual result: Warnings about TypeScript 5.9.3 being incompatible.
Details
Standard questions
Please answer these questions to help us investigate your issue more quickly:
| Question | Answer |
|---|---|
@rushstack/heft version? |
1.1.7 |
| Operating system? | Mac |
| Would you consider contributing a PR? | Yes |
Node.js version (node -v)? |
24.11.1 |
- Dominant language
- TypeScript
- Stars
- 6.5k
- Forks
- 708
- Avg merge
- 4d 13h
- Merged PRs (30d)
- 62
Contributor guide
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First steps
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- Open a pull request that references the issue number.
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