microsoft / microsoft/TypeScript-TmLanguage
[Typescript] Broken arrow function signature highlighting
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- Dominant language
- TypeScript
- Stars
- 471
- Forks
- 149
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Description
Does this issue occur when all extensions are disabled?: Yes
- VS Code Version: 1.66.2
- OS Version: Linux 5.17.5-arch1-1
Syntax highlighting breaks on arrow functions with return type being multiline tuple, works fine on function declarations.
Steps to Reproduce:
const foo = ({ a, b }: any): [
el1: number,
el2: string,
] => {
a
b
return [1, '2']
}
Expected highlight:
Actual highlight:
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the TypeScript snippet in VS Code with extensions disabled, then inspect the repository’s TypeScript TextMate grammar files for the multiline tuple return-type rule. Done means arrow-function signatures with multiline labeled tuple return types highlight like equivalent function declarations without regressing the provided example.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100