Domain: PerformanceHelp WantedPossible Improvement
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描述
🔎 Search Terms
Control Flow
🕗 Version & Regression Information
- This changed in commit or PR ： https://github.com/microsoft/TypeScript/pull/58013
⏯ Playground Link
No response
💻 Code
🙁 Actual behavior
I encountered a severe performance regression when type-checking a very large JavaScript file (~360,000 lines).
v4.9.5: Type-checking takes ~16,476ms.
v5.5.4: Type-checking time increases to ~64,196ms (4x slower).
Steps to Reproduce:
- Clone the attached project and run:
npm install
node checker.js
- Switch TypeScript versions (e.g., between v4.9.5 and v5.5.4) and re-test.
After testing, I believe this regression was introduced by PR #58013. When I revert this commit, the performance returns to v4.9.5 levels.
🙂 Expected behavior
The performance is the same as v4.9.5
Additional information about the issue
No response