Autocompletion incredible slow for easy tasks since VSC July 2021 update

[flashspys]

• I have searched through existing issues
• I have read through docs
• I have read FAQ
• I have tried restarting VS Code or running Vetur: Restart VLS

Info

• Platform: MacOS and Linux
• Vetur version: 0.34.1
• VS Code version: 1.59.0

Problem

We have a quite large Vue 2 project, most parts in typescript. The code completion on very easy types (e.g. a simple string array) is very slow. A cpu profile is attached. Its quite a mess to view, I can't read a lot from it. In this profile I invoked code completion on an array. It took about 15s to complete.
CPU-20210816T144628.cpuprofile.zip

The vue-language-server outputs very often

[Error - 2:41:08 PM] Request textDocument/semanticTokens/range failed.
  Message: Request textDocument/semanticTokens/range failed with message: Cannot read property 'flags' of undefined
  Code: -32603 

Please let me know if you need further information.

[dorian-marchal]

Same issue but for a Vue 2 project in JS (not TS).
Saving takes up to 8 seconds in a ~300 lines single file component.

[douglasg14b]

Same issue here, sometimes take MINUTES with TS components. (When auto completing file paths for imports)

Vue Language Server output spams Request textDocument/semanticTokens/range failed with message: Cannot read property 'flags' of undefined

[douglasg14b]

More verbose log entries look like:

[2021-12-14 16:00:22.973] [renderer1] [error] Request textDocument/semanticTokens/full failed with message: Cannot read property 'flags' of undefined: Error: Request textDocument/semanticTokens/full failed with message: Cannot read property 'flags' of undefined
at c:\Users\Douglas.vscode\extensions\octref.vetur-0.35.0\dist\vueMain.js:1:64858
at c:\Users\Douglas.vscode\extensions\octref.vetur-0.35.0\dist\vueMain.js:1:65153
at Immediate. (c:\Users\Douglas.vscode\extensions\octref.vetur-0.35.0\dist\vueMain.js:1:65518)
at processImmediate (internal/timers.js:461:21)

[douglasg14b]

Perhaps this should be a bug, and not perf @yoyo930021?

I assume the problem is here:

vetur/server/src/modes/script/semanticToken.ts

Lines 113 to 122 in 5651cd5

	walk(sourceFile, node => {
	if (!ts.isIdentifier(node) || node.text !== 'value' || !ts.isPropertyAccessExpression(node.parent)) {
	return;
	}
	const propertyAccess = node.parent;
	let parentSymbol = typeChecker.getTypeAtLocation(propertyAccess.expression).symbol;
	if (parentSymbol.flags & tsModule.SymbolFlags.Alias) {
	parentSymbol = typeChecker.getAliasedSymbol(parentSymbol);

parentSymbol can be undefined perhaps? I have literally no idea what should be done in that instance though, or perhaps if the bug is further upstream and parentSymbol should never be undefined?

[douglasg14b]

Well, if I just return early if !parentSymbol I actually get auto-completion again, it's just ~10-30+s or so per auto-completion (When auto completing file paths for imports). So that's progress at least...

It's weird, this project used to not have any issues here, now it does. Autocomplete for file paths is snappy in ts or js files, it's just bog slow/useless in vue files.

The TypeScript output doesn't show any log entries when trying to resolve paths in a vue file, but it does in a s file? Is Vetur doing this in it's own way?

---

I am now getting the following when trying to autcomplete paths:

[Error - 5:19:15 PM] (node:13768) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 57)
[Error - 5:19:21 PM] (node:13768) UnhandledPromiseRejectionWarning: Error: Debug Failure. False expression: Script kind should match provided ScriptKind:3 and sourceFile.scriptKind: 1, !entry: false
at getDocumentRegistryEntry (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:129643:22)
at acquireOrUpdateDocument (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:129651:40)
at Object.updateDocumentWithKey (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:129639:20)
at getOrCreateSourceFileByPath (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:157300:53)
at Object.getOrCreateSourceFile [as getSourceFile] (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:157257:24)
at findSourceFileWorker (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:113284:29)
at findSourceFile (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:113194:26)
at C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:113146:85
at getSourceFileFromReferenceWorker (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:113113:34)
at processSourceFile (C:\Users\Douglas\Documents\Programming\3rd Party\vetur-master\server\node_modules\typescript\lib\typescript.js:113146:13)
[Error - 5:19:21 PM] (node:13768) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 58)