JS/TS language features/server keeps crashing.

[tzjames]

Type: Bug

Initializing JS/TS language features plugin keeps crashing. It eats up my CPU. As long as I am currently on a .ts file it seems to do it.

VS Code version: Cursor 0.40.4 (63dae81aea2c3fc079420fe72578a8eef26ba870, 2024-09-05T02:52:05.660Z)
OS version: Darwin arm64 23.5.0
Modes:

System Info

Item	Value
CPUs	Apple M2 Max (12 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	8, 8, 7
Memory (System)	32.00GB (0.20GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (24)

Extension	Author (truncated)	Version
jupyter-keymap	ms-	1.1.2
pyright	any	1.1.327
gitlens	eam	15.4.0
prettier-vscode	esb	11.0.0
vscode-github-actions	git	0.26.3
vscode-pull-request-github	Git	0.92.0
go	gol	0.42.0
terraform	has	2.32.3
svg	joc	1.5.4
vscode-docker	ms-	1.29.2
debugpy	ms-	2024.6.0
python	ms-	2024.12.3
vscode-pylance	ms-	2024.8.1
jupyter	ms-	2024.6.0
jupyter-renderers	ms-	1.0.19
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
remote-containers	ms-	0.327.0
live-server	ms-	0.4.14
makefile-tools	ms-	0.10.26
vscode-typescript-next	ms-	5.7.20240904
vscode-jest	Ort	6.2.5
vscode-coverage-gutters	rya	2.11.1
eno	Wsc	2.3.53

[danperks]

Can you check the Output tab (CTRL+Shift+M) and choose the "TypeScript" option in the dropdown, and see if there are any errors or crashing in there?

It's hard to diagnose from your system info and extensions alone, without knowing what the crash actually is, thanks :)

[MatthewMaclean]

Mine occasionally gets into a state like this while I'm editing code and occasionally using the tab completion. I haven't narrowed down a repro yet, but I do see this semi-regularly.

2024-09-19 12:35:26.044 [error] TSServer exited. Code: null. Signal: SIGABRT
2024-09-19 12:35:26.045 [info] Starting TS Server
2024-09-19 12:35:26.045 [info] Using tsserver from: <repo_path>/node_modules/typescript/lib/tsserver.js
2024-09-19 12:35:26.045 [info] <syntax> Forking...
2024-09-19 12:35:26.045 [info] <syntax> Starting...
2024-09-19 12:35:26.045 [info] <semantic> Forking...
2024-09-19 12:35:26.045 [info] <semantic> Starting...
2024-09-19 12:35:30.824 [error] TSServer exited. Code: null. Signal: SIGTERM
2024-09-19 12:35:30.824 [info] Starting TS Server
2024-09-19 12:35:30.824 [info] Not starting server: disposed
2024-09-19 12:35:32.982 [info] Starting TS Server
2024-09-19 12:35:32.983 [info] Using tsserver from: <repo_path>/node_modules/typescript/lib/tsserver.js
2024-09-19 12:35:32.983 [info] <syntax> Forking...
2024-09-19 12:35:32.983 [info] <syntax> Starting...
2024-09-19 12:35:32.983 [info] <semantic> Forking...
2024-09-19 12:35:32.983 [info] <semantic> Starting...
2024-09-19 12:38:42.250 [error] TSServer exited. Code: null. Signal: SIGABRT
2024-09-19 12:38:42.250 [info] Starting TS Server
2024-09-19 12:38:42.250 [info] Using tsserver from: <repo_path>/node_modules/typescript/lib/tsserver.js
2024-09-19 12:38:42.250 [info] <syntax> Forking...
2024-09-19 12:38:42.250 [info] <syntax> Starting...
2024-09-19 12:38:42.250 [info] <semantic> Forking...
2024-09-19 12:38:42.250 [info] <semantic> Starting...

[danperks]

At least with the error you are facing @MatthewMaclean , this appears to be a general issue with the TSServer that affects Code, the underlying OSS app that VSCode and Cursor is based off. I'd recommend tracking some of the issues in their repo as a few resolution suggestions have been made there.

A few people have said that reloading Cursor (/VSCode) without extensions stops it crashing, but no-one has found which extension(s) seem to cause this issue.
It's also suggested that the TS Server may be running out of memory on big projects.

I'll close this for now, as it's highly unlikely to be a Cursor bug - at most, if the bug is fixed in Code, it may just need a version bump of Code in a later version of Cursor.

For reference:
VSCode #161291
VSCode #171157
VSCode #191441
TypeScript #44951

[MatthewMaclean]

Interesting, at least based off of my experience, it happens way more frequently when using Cursor than I'd seen while using VSCode natively (but I agree VSCode/TS server have their own problems). I'd never seen warnings like The JS/TS language service crashed 5 times in the last 5 Minutes. before.

Is there additional information I could track down to see if it's Cursor specific?

[danperks]

My guess with that is that Cursor uses an older version of VSCode (or technically Code, the OSS app that VSCode and Cursor is based on) under the hood, and it’s possible there are improvements to the usage of TSServer in newer VSCode releases that Cursor hasn’t yet got.

Especially if TSServer ships within VSCode/Cursor, it’s highly probable that my guess has at least some cause.

Try running Cursor with no extensions (“Relaunch without Extensions” is in the command palette) and compare it to VSCode then, as it could be an extension (or an older version of one compared to your VSCode installation) is causing some issues.

[moritzlaube]

Just for the record, anyone finding this: The extension "Import cost" did cause my extension host to crash constantly. I found out with the recommended bisect method. Uninstalling the extension did solve the problem.

[anetrebskii]

@moritzlaube Thank you! I've just found that it crashed at the moment when cursor.ai crashed. I have just uninstalled it 🤞

[danperks]

Anyone else facing this, this is usually due to a bad extension that runs for JS/TS code, that crashes.
Like the users above, check your logs to see if you can find the suspect extension!

If anyone's facing this on a fresh install, please create a new issue, thanks.