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Specific JS construct breaks syntax highlighting

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#988 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Domain
tooling

Research direction

Reproduce the issue in a fresh JavaScript file using the provided snippet and confirm that highlighting after function one is incorrect. Then inspect the TypeScript-TmLanguage grammar files for handling of nested object properties, arrow functions, and return statements; done means later functions receive correct keyword highlighting.

Written by the indexing model from the issue text.

Description

Does this issue occur when all extensions are disabled?: Yes

  • VS Code Version: 1.81.0 / 6445d93c81ebe42c4cbd7a60712e0b17d9463e97
  • OS Version: Windows_NT x64 10.0.19045

Snippet:

function one() {
	return (
		{
			toString: () => {
				return "Something";
			}
		}
	);
}

function two() {
	return "??";
}

Screenshot:
image

Steps to Reproduce:

  1. Paste the following into a fresh file with JavaScript set as a language
  2. Observe keyword highlighting not working correctly for any functions following function one

This specific nesting (a lambda function with a block inside a property of an object inside parenthesis in a return statement) triggers the effect.

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

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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