Combination of optional operator and new line breaks syntax higlighting in function arguments

Open

#1,059 opened on Sep 2, 2025 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 45/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: typescript
Domain: tooling

Research direction

Reproduce the issue with the TypeScript examples in the report using the repository's TextMate grammar in a supported editor. Inspect the grammar rules responsible for optional parameters, object-type members, and multiline function arguments. Done means the multiline optional-parameter example receives the same correct highlighting as the other examples.

Written by the indexing model from the issue text.

Description

Code

// Syntax hilighting is INCORRECT ❌
const a = async (params?: {
  arg?: string | number;
  arg2?: string | number;
  arg3?: string | number;
}) => {
  return params;
};

// Syntax hilighting is CORRECT ✅
const b = async (params: {
  arg?: string | number;
  arg2?: string | number;
  arg3?: string | number;
}) => {
  return params;
};

// Syntax hilighting is CORRECT ✅
const c = async (params?: { arg?: string | number }) => {
  return params;
};

// Syntax hilighting is CORRECT ✅
const d = async (params: { arg?: string | number }) => {
  return params;
};

Dominant language: TypeScript
Stars: 471
Forks: 149
PR merge metrics: No merged PRs in 30d

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