tsserver 100% CPU

[rebornix]

Issue Type: Bug

Ran into this issue a couple of times with VS Code repo recently with TypeScript 3.9.3, the syntax only tsserver is running fine.

VS Code version: Code - Insiders 1.46.0-insider (876f2e7, 2020-05-27T05:41:02.088Z)
OS version: Darwin x64 19.4.0
Remote OS version: Darwin x64 19.4.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (16 x 2400)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	3, 3, 3
Memory (System)	32.00GB (0.95GB free)
Process Argv	-psn_0_3576681
Screen Reader	no
VM	12%

Item	Value
Remote	SSH: penlv-imac
OS	Darwin x64 19.4.0
CPUs	Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz (8 x 6182)
Memory (System)	32.00GB (21.50GB free)
VM	0%

Extensions (23)

Extension	Author (truncated)	Version
comment-tagged-templates	bie	0.3.0
github-markdown-preview	bie	0.0.2
markdown-emoji	bie	0.0.9
markdown-preview-github-styles	bie	0.1.6
gitlens	eam	10.2.1
tsl-problem-matcher	eam	0.2.0
vscode-pull-request-github-insiders	Git	2020.5.38341
vscode-docker	ms-	1.2.1
vscode-language-pack-zh-hans	MS-	1.46.0
remote-containers	ms-	0.118.0
remote-ssh-edit-nightly	ms-	2020.5.19620
remote-ssh-nightly	ms-	2020.5.19620
js-debug-nightly	ms-	2020.5.1917
powershell	ms-	2020.4.0
vscode-github-issue-notebooks	ms-	0.0.24
vsliveshare	ms-	1.0.2236
debugger-for-chrome	msj	4.12.8
kuskus-extensions-pack	ros	1.0.1
kuskus-kusto-language-server	ros	1.0.1
kuskus-kusto-syntax-highlighting	ros	1.1.8
sourcekit-lsp	unp	0.0.1
notebook-renderers	vsc	1.0.0
notebook-test	vsc	1.0.0

(5 theme extensions excluded)

[mjbvz]

@rebornix Did you run yarn before this happened? Sometime a yarn install can trigger this

[rebornix]

Right, I yarn after fetching master due to electron version change. Will keep an eye on this.

[mjbvz]

Thanks. I believe this is the same issue as microsoft/TypeScript#37653 then. I'm going to test out the potential TS fix for this

[rebornix]

I can confirm that the issue I was seeing was the typescript bug linked above, every time after yarn, tsserver goes to 100%.

[mjbvz]

Just updated VS Code to use TypeScript 4.0 in the workspace. Please let me know if you see this again after running yarn install