Microsoft/TypeScript

The parsed identifier is incomplete due to updateSourceFile.

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#60,773 opened on Dec 16, 2024

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BugDomain: ParserHelp Wanted

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Description

🔎 Search Terms

updateSourceFile

🕗 Version & Regression Information

5.6.0

⏯ Playground Link

No response

💻 Code

// Your code here

🙁 Actual behavior

class Test { testMethod() { let newLocal = "kk" let a = 123 let b = 12 } } After the value of variable b is changed, the identifiers set of sourceFile parsed by the updateSourceFile method contains only Test, testMethod, and b. Variables a and newLocal are lost.

🙂 Expected behavior

the identifiers set of sourceFile contains Test, testMethod, b, a and newLocal.

Additional information about the issue

No response

Contributor guide

Research direction
Investigate the updateSourceFile function in the TypeScript compiler to understand how it tracks identifiers when a file is updated. Focus on how the identifier set is rebuilt and why variables a and newLocal are lost after changing variable b.
Tech stack
typescript
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
TypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45