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

Issue Type: Bug

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

TypeScript Version: 4.4.0-dev.20210707

Steps to reproduce crash

I just opended the project

TS Server Log
❗️ Please review and upload this log file to help us diagnose this crash:
/Users/jake/Library/Application Support/Code/logs/20210627T002751/exthost17/vscode.typescript-language-features/tsserver-log-jDF14S/tsserver.log
The log file may contain personal data, including full paths and source code from your workspace. You can scrub the log file to remove paths or other personal information.

TS Server Error Stack
Server: semantic

TypeError: Cannot read property 'lastIndexOf' of undefined
    at Object.startsWith (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:2064:20)
    at isNodeModulesOrScopedPackageDirectory (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:19667:65)
    at guessDirectorySymlink (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:19655:17)
    at processResolution (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:19644:22)
    at /Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:19635:162
    at Map.forEach (<anonymous>)
    at Object.setSymlinksFromResolutions (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:19635:123)
    at ConfiguredProject.Project.getSymlinkCache (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:160332:35)
    at Object.getSymlinkCache (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:113527:29)
    at Object.host.compilerHost.realpath (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:113592:36)
    at realPath (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:41457:42)
    at Object.resolveTypeReferenceDirective (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:40825:74)
    at /Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:161687:112
    at Object.map (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:455:29)
    at Function.AutoImportProviderProject.getRootFileNames (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:161687:42)
    at Function.AutoImportProviderProject.create (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:161720:38)
    at ConfiguredProject.Project.getPackageJsonAutoImportProvider (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:161525:77)
    at ConfiguredProject.Project.updateGraph (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:160948:26)
    at ConfiguredProject.updateGraph (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:161889:63)
    at ProjectService.createLoadAndUpdateConfiguredProject (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:163613:25)
    at ProjectService.assignProjectToOpenedScriptInfo (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:164694:44)
    at /Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:165034:97
    at Object.flatMap (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:519:25)
    at ProjectService.applyChangesInOpenFiles (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:165034:41)
    at Session.handlers.ts.Map.ts.getEntries._a.<computed> (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:166194:46)
    at /Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:168121:88
    at IOSession.Session.executeWithRequestId (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:168112:28)
    at IOSession.Session.executeCommand (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:168121:33)
    at IOSession.Session.onMessage (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:168147:35)
    at Interface.<anonymous> (/Users/jake/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.4.20210707/node_modules/typescript/lib/tsserver.js:170746:31)
    at Interface.emit (events.js:315:20)
    at Interface._onLine (readline.js:337:10)
    at Interface._normalWrite (readline.js:482:12)
    at Socket.ondata (readline.js:194:10)
    at Socket.emit (events.js:315:20)
    at addChunk (internal/streams/readable.js:309:12)
    at readableAddChunk (internal/streams/readable.js:284:9)
    at Socket.Readable.push (internal/streams/readable.js:223:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:188:23)

VS Code version: Code 1.57.1 (507ce72a4466fbb27b715c3722558bb15afa9f48, 2021-06-17T13:28:32.912Z)
OS version: Darwin x64 20.5.0
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz (8 x 2000)
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	6, 5, 4
Memory (System)	16.00GB (0.48GB free)
Process Argv	. --crash-reporter-id 18502848-7f0c-420a-ac31-a1e1385e09ba
Screen Reader	no
VM	0%

Extensions (87)

Extension	Author (truncated)	Version
better-comments	aar	2.1.0
vscode-javascript-repl	ach	0.7.2
Bookmarks	ale	13.1.0
jest-snippets	and	1.8.0
vscode-apollo	apo	1.19.3
emojisense	bie	0.8.0
markdown-checkbox	bie	0.1.3
vscode-tailwindcss	bra	0.6.13
pgformatter	bra	1.17.0
multi-cursor-case-preserve	Car	1.0.5
npm-intellisense	chr	1.3.1
path-intellisense	chr	2.3.0
codeswing	cod	0.0.19
gitignore	cod	0.7.0
bracket-pair-colorizer-2	Coe	0.2.1
vscode-eslint	dba	2.1.23
es7-react-js-snippets	dsz	3.1.1
docthis-customize-tags	dwe	0.4.5
gitlens	eam	11.5.1
vscode-npm-script	eg2	0.3.22
vscode-great-icons	emm	2.1.79
moxer-icons	Equ	5.8.0
vsc-material-theme-icons	equ	1.2.2
prettier-vscode	esb	8.0.1
code-runner	for	0.11.4
vscode-pull-request-github	Git	0.27.1
ruby	gro	0.1.0
todo-tree	Gru	0.0.213
ruby-linter	hoo	1.0.0
rest-client	hum	0.24.5
output-colorizer	IBM	0.1.2
monkey-patch	ioc	0.1.15
vscode-essentials	jab	1.5.0
search-editor-apply-changes	jak	0.1.1
vscode-edit-csv	jan	0.6.0
rainbow-end	jdu	0.7.8
vscode-peacock	joh	3.9.1
sublime-babel-vscode	jos	0.2.10
chat	kar	0.35.0
sequelize-vscode-association-snippet	lou	0.0.2
vscode-language-babel	mgm	0.0.31
dotenv	mik	1.0.1
ruby-rubocop	mis	0.8.5
HTMLHint	mka	0.10.0
prettify-json	moh	0.0.3
vscode-postgresql	ms-	0.3.0
python	ms-	2021.6.944021595
vscode-pylance	ms-	2021.7.2
jupyter	ms-	2021.6.999662501
remote-containers	ms-	0.183.0
remote-ssh	ms-	0.65.7
remote-ssh-edit	ms-	0.65.7
remote-wsl	ms-	0.56.5
vscode-remote-extensionpack	ms-	0.21.0
cpptools	ms-	1.4.1
js-debug-nightly	ms-	2021.6.1117
typescript-javascript-grammar	ms-	0.0.55
vscode-typescript-next	ms-	4.4.20210707
vsliveshare	ms-	1.0.4531
vsliveshare-audio	ms-	0.1.91
debugger-for-chrome	msj	4.12.12
color-highlight	nau	2.3.0
vscode-javascript-comment	Nic	0.0.7
leaper	Onl	0.6.0
material-icon-theme	PKi	4.8.0
polacode	pnp	0.3.4
subtle-brackets	raf	3.0.0
vscode-commons	red	0.0.6
vscode-xml	red	0.17.0
vscode-yaml	red	0.20.0
LiveServer	rit	5.6.1
rust	rus	0.7.8
partial-diff	ryu	1.4.3
vscode-sql-beautify	sen	0.0.4
trailing-spaces	sha	0.3.1
vscode-smoothtype	spi	1.2.0
rewrap	stk	1.14.0
hyper-javascript-snippets	t7y	3.2.1
vscode-status-bar-format-toggle	tom	2.0.0
lodash-snippets	tom	1.0.0
vscodeintellicode	Vis	1.2.14
codetour	vsl	0.0.56
gistfs	vsl	0.3.0
vscode-ruby	win	0.28.0
JavaScriptSnippets	xab	1.8.0
vscode-surround	yat	1.1.2
markdown-all-in-one	yzh	3.4.0

(17 theme extensions excluded)

A/B Experiments

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vsreu685:30147344
python383cf:30185419
pythonvspyt602:30300191
vspor879:30202332
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pythonvspyt639:30300192
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(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. (#124192)
TS Server fatal error: Debug Failure. False expression. (#125945)
TS Server fatal error: Cannot read property 'path' of undefined (#125379)
TS Server fatal error: Debug Failure. Text of property name cannot be read from non-literal-valued ComputedPropertyNames (#125677)
TS Server fatal error: Debug Failure. Expected 4 === 3. Registered script kind should match new script kind. (#123401)

Please follow the steps in the issue to provide additional information, such as the server log

I believe MacOS uses a case-insensitive file system by default, so it would have hit the same issue as Windows , but that also means that the same mitigation should apply (with the caveat that all bets are off if your project spans both case-sensitive and case-insensitive file systems).

I'm experiencing the same issue (same stack trace) so TS has been unusable for the past few days

Edit: Downgraded to 4.0.5 and now is working

Someone gave some info on how to repro: #43105 (comment)

Not sure if that’s actually enough to create a repro, but looking at guessDirectorySymlink, you can certainly imagine the loop running until aParts.length or bParts.length is less than 2. Let’s try to create a realistic repro from the comment above, but failing that, just fix it logically (terminate the loop when the remaining path parts get too short).

I faced this issue after upgrading from 4.2.4 to 4.3.5. We have "typeRoots": ["node_modules/@types"]. But, we have .d.ts files under ./typings and my debugging revels that it happens from ./typings/index.d.ts.

Facing the same issue when typeRoots is included in tsconfig.json and called ts.getPreEmitDiagnostics(program). Upgrading ts to 4.5.0-beta fix it.

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TS Server fatal error: Cannot read property 'lastIndexOf' of undefined #44953

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TS Server fatal error: Cannot read property 'lastIndexOf' of undefined #44953

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vscodebot commented on Jul 8, 2021

mjbvz commented on Jul 8, 2021

amcasey commented on Jul 8, 2021

cory2067 commented on Sep 7, 2021

andrewbranch commented on Sep 13, 2021

shihabuddin commented on Sep 16, 2021

tychenjiajun commented on Oct 21, 2021

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