ProjectService.updateNonInferredProjectFiles - Cannot read property 'path' of undefined

[mjbvz]

TypeScript Version: 3.8.0-dev-2019-11-05 and 3.7.2

Search Terms:

• Untitled file / buffer

Repo
(Tested on windows)

1. Open the VS Code repo.
2. Have a single file refactor.ts open: https://github.com/microsoft/vscode/blob/master/extensions/typescript-language-features/src/features/refactor.ts
3. Reload window to make sure you are in a clean state
4. Wait for TS to finish loading in refactor.ts
5. Now create an untitled file (ctrl+n)
6. Change the language mode of the new file to Typescript (without saving it)

Bug

Cannot read property 'path' of undefined
TypeError: Cannot read property 'path' of undefined
    at ProjectService.updateNonInferredProjectFiles (tsserver.js:137488:43)
    at ProjectService.addFilesToNonInferredProject (tsserver.js:137378:22)
    at ProjectService.updateRootAndOptionsOfNonInferredProject (tsserver.js:137526:22)
    at ProjectService.loadConfiguredProject (tsserver.js:137462:22)
    at ProjectService.createAndLoadConfiguredProject (tsserver.js:137402:22)
    at ProjectService.createLoadAndUpdateConfiguredProject (tsserver.js:137407:36)
    at ProjectService.assignProjectToOpenedScriptInfo (tsserver.js:138230:44)
    at tsserver.js:138461:107
    at Object.mapDefined (tsserver.js:565:30)
    at ProjectService.applyChangesInOpenFiles (tsserver.js:138461:48)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:139315:46)
    at tsserver.js:140973:88
    at IOSession.Session.executeWithRequestId (tsserver.js:140964:28)
    at IOSession.Session.executeCommand (tsserver.js:140973:33)
    at IOSession.Session.onMessage (tsserver.js:140996:35)
    at Interface.<anonymous> (tsserver.js:142311:27)
    at Interface.emit (events.js:200:13)
    at Interface._onLine (readline.js:314:10)
    at Interface._normalWrite (readline.js:459:12)
    at Socket.ondata (readline.js:170:10)
    at Socket.emit (events.js:200:13)
    at addChunk (_stream_readable.js:294:12)
    at readableAddChunk (_stream_readable.js:275:11)
    at Socket.Readable.push (_stream_readable.js:210:10)

This seems to be caused by the line

TypeScript/src/server/editorServices.ts

Line 1854 in 35a6426

scriptInfo = this.getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(normalizedPath, project.currentDirectory, scriptKind, hasMixedContent, project.directoryStructureHost)!; // TODO: GH#18217

related issues

• Tracking invalid type assertions #18217

/cc @sheetalkamat

[mjbvz]

@RyanCavanaugh Candidate for 3.7.3.

Not a regression since this also repos for me under 3.6.4 but VS Code now treats errors that happen during updateOpen as non-recoverable, which means we restart the TS server.

[sheetalkamat]

@mjbvz I don't seem to be able to repro (tsserver.log) with insiders and 3.7.2 or with 3.8 and vscode (tsserver.log)

[mjbvz]

This is triggered by the tslint extension. A pr came in that changes the working directory using process.chdir (microsoft/typescript-tslint-plugin#39)

When the new file is created, TS Server then ends calling fileExists('tsconfig.json') as part of getConfigFileNameForFile. Normally this returns false but now it returns true since the working directory is different. The the default working directory for me is "/Users/matb", while in the error case the working directory is now "/Users/matb/projects/vscode/extensions/typescript-language-features"

This likely has been happening silently for a while but the new strictness I added means that we now restart the server in this case. I'll look into a fix on the TSlint side.

@sheetalkamat I don't understand why fileExists('tsconfig.json') is called in the first place. It seems like in this case, we always want it to return false?

[sheetalkamat]

@mjbvz We need to get the config file for the file being opened, so its walking up the directories to find it...