vscode: `getTokenInformationAtPosition` API causes too much traffic and blocks the renderer process

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function hello() {
    //
}
function hello2() {
}
function hello3() {
}

Try to work in the file and observe how the window is not really responsive. Add a console log statement here – https://github.com/microsoft/vscode/blob/353e8f4fbadc048125593c8e34723bc667f373ce/src/vs/workbench/api/browser/mainThreadLanguages.ts#L47

Observe how after each keystroke there are thousands of requests going from the extension host to the renderer process.

Kapture 2020-06-04 at 12 43 07

About this issue

  • Original URL
  • State: open
  • Created 4 years ago
  • Comments: 23 (18 by maintainers)

Commits related to this issue

Most upvoted comments

My concern with adding API that will be flawed even when used correctly. I can see the bug coming where people want to simply read the language configuration up-front

I was thinking of some kind of vscode.languages.onDidChangeConfiguration-event that consumers need to track. We do have the corresponding event on the service/registry which tells me that language config is changing. If that’s true and happening extension authors might workaround the missing event by calling (async) getLanguageConfiguration(<langId>) in tight loops etc

+1
jrieken on Nov 4, 2021

There was https://github.com/microsoft/vscode/issues/109919 for getting the language configuration. It seems that faded away, maybe @alexdima wants to reconsider.

+1
jrieken on Nov 1, 2021

@jrieken I should be able to add a reasonable guess about whether there is a comment using the language configuration as you suggested. Would you consider API to expose the language configuration?

+1
alexr00 on Nov 1, 2021

Sorry about that. I have no recollection of making this a feature-request.

+1
alexr00 on Dec 4, 2020
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