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Control Flow Analysis Performance Regression #62050

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Domain: PerformanceReports of unusually slow behaviorHelp WantedYou can do thisPossible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some cases
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@xpy5910

Description

@xpy5910

🔎 Search Terms

Control Flow

🕗 Version & Regression Information

⏯ Playground Link

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💻 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:
  1. Clone the attached project and run:
npm installnode checker.js
  1. 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.
testLargeFile.zip
🙂 Expected behavior
The performance is the same as v4.9.5
Additional information about the issue
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    Domain: PerformanceReports of unusually slow behaviorHelp WantedYou can do thisPossible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some cases
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