TS Server fatal error: Cannot read property 'charCount' of undefined

[nol166]

Issue Type: Bug

❗️❗️❗️ Please fill in the sections below to help us diagnose the issue ❗️❗️❗️

TypeScript Version: 4.1.2

Steps to reproduce crash

1. Create comments using command slash
2. Save document with auto format enabled

TS Server Log
❗️Server logging disabled. To help us fix crashes like this, please enable logging by setting:

"typescript.tsserver.log": "verbose"

After enabling this setting, future crash reports will include the server log.

TS Server Error Stack
Server: syntax

TypeError: Cannot read property 'charCount' of undefined
    at LineNode.walk (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158978:68)
    at LineIndex.edit (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158859:31)
    at ScriptVersionCache._getSnapshot (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158649:47)
    at ScriptVersionCache.lineOffsetToPosition (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158668:29)
    at TextStorage.lineOffsetToPosition (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:150171:33)
    at ScriptInfo.lineOffsetToPosition (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:150526:41)
    at /Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:156412:56
    at Object.next (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:627:33)
    at ProjectService.applyChangesToFile (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:155405:46)
    at ProjectService.applyChangesInOpenFiles (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:155372:30)
    at Session.handlers.ts.Map.ts.getEntries._a.<computed> (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:156403:46)
    at /Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158276:88
    at IOSession.Session.executeWithRequestId (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158267:28)
    at IOSession.Session.executeCommand (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158276:33)
    at IOSession.Session.onMessage (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:158300:35)
    at Interface.<anonymous> (/Applications/Visual Studio Code - Insiders.app/Contents/Resources/app/extensions/node_modules/typescript/lib/tsserver.js:160510:27)
    at Interface.emit (events.js:315:20)
    at Interface._onLine (readline.js:329:10)
    at Interface._normalWrite (readline.js:474:12)
    at Socket.ondata (readline.js:186:10)
    at Socket.emit (events.js:315:20)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:271:9)
    at Socket.Readable.push (_stream_readable.js:212:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:186:23)

VS Code version: Code - Insiders 1.53.0-insider (32b28f6, 2021-01-19T06:10:41.343Z)
OS version: Darwin arm64 20.2.0

System Info

Item	Value
CPUs	undefined
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	16.00GB (0.32GB free)
Process Argv	--crash-reporter-id e905019d-24d6-4a80-9e6d-01294d75c825
Screen Reader	no
VM	0%

Extensions (9)

Extension	Author (truncated)	Version
better-comments	aar	2.1.0
turbo-console-log	Cha	2.1.6
bracket-pair-colorizer-2	Coe	0.2.0
vscode-eslint	dba	2.1.14
es7-react-js-snippets	dsz	3.1.0
prettier-vscode	esb	5.8.0
vscode-open	san	0.1.0
code-spell-checker	str	1.10.2
markdown-all-in-one	yzh	3.4.0

A/B Experiments

vsliv695:30137379
vsins829:30139715
vsliv368:30146709
vsreu685:30147344
openlogontheside:30221882
python383:30185418
vspyt653:30244269
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30208929
wsl2prompt:30219162
vstry914:30244316
pythonvsdeb440:30224570
unusedprompt:30219164
folderexplorer:30219166
openfilemenucf:30219169
pythonvsded773:30223139
pythonvspyt600cf:30241728
core-portspanel:30233467

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• TS Server fatal error: Debug Failure. False expression. (#113984)
• TS Server fatal error: Debug Failure. False expression. (#113570)
• TS Server fatal error: Debug Failure. (#108873)
• TS Server fatal error: Debug Failure. (#113880)
• TS Server fatal error: Debug Failure. (#109598)

[mjbvz]

Can you share the source of the file that this is triggered in and how to trigger this bug in that file?

[nol166]

To be honest with you, I can't remember what file I was working with. It was a React functional component and I was working on the jsx portion of a return. I will try to take better notes when and if this happens again. Should I enable verbose logging for the tsserver?

[mjbvz]

Yes please enable logging and let us know if you hit this again. Closing for now since we can't investigate without steps to reproduce or a log