Microsoft/TypeScript

`tsc` loses the class name in sourcemap

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#55,912 opened on Sep 29, 2023

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 (0 comments) (4 reactions) (0 assignees)TypeScript (6,726 forks)batch import
Domain: Source MapsHelp WantedPossible Improvement

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Description

🔎 Search Terms

  • stack trace
  • lose class name

🕗 Version & Regression Information

Now I use TypeScript v5.2.2. This is not a critical bug, so I did not pay attention when it appeared.

💻 Code

// tmp.ts
class MyClass {
  static staticMethod() {
    throw new Error('Error in static method');
  }
}

MyClass.staticMethod();

Enable sourceMap in tsconfig, compile this code with tsc and then run compiled file with --enable-source-maps option:

tsc tmp.ts
node --enable-source-maps dist/tmp.js

🙁 Actual behavior

Error: Error in static method
    at Function.staticMethod

As you can see, the class name is missing from the stack trace. This bug appears only when the error occurs in static methods.

🙂 Expected behavior

Error: Error in static method
    at MyClass.staticMethod

Contributor guide

Research direction
Investigate how TypeScript generates source maps for static method calls and trace the mapping from the compiled JavaScript to the original TypeScript class method.
Tech stack
typescript
Domain
compilers
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
TypeScriptNode.js
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65