TypeError: Cannot read property 'checkJsDirective' of undefined

[mjbvz]

From microsoft/vscode#91247

TypeScript Version: 3.8.2

Search Terms:

• updateOpened
• applyChangesInOpenFiles

Crash
We saw a user report this crash in VS Code:

TypeError: Cannot read property 'checkJsDirective' of undefined
    at ProjectService.telemetryOnOpenFile (tsserver.js:143789:79)
    at tsserver.js:143868:76
    at Array.forEach (<anonymous>)
    at ProjectService.applyChangesInOpenFiles (tsserver.js:143868:37)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:144722:46)
    at tsserver.js:146465:88
    at IOSession.Session.executeWithRequestId (tsserver.js:146456:28)
    at IOSession.Session.executeCommand (tsserver.js:146465:33)
    at IOSession.Session.onMessage (tsserver.js:146489:35)
    at Interface.<anonymous> (tsserver.js:147804:27)
    at Interface.emit (events.js:203:13)
    at Interface._onLine (readline.js:316:10)
    at Interface._normalWrite (readline.js:461:12)
    at Socket.ondata (readline.js:172:10)
    at Socket.emit (events.js:203:13)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:276:11)
    at Socket.Readable.push (_stream_readable.js:210:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:166:17)

[mjbvz]

@selfrefactor Can you share a project the causes this issue?

[mjbvz]

Also @RyanCavanaugh, marking this as priority since it causes VS Code to restart the TS server. Another one for a 3.8.x recovery build

[selfrefactor]

@mjbvz I am unsure about which project caused it.
I think it was https://github.com/selfrefactor/on as I was surprised as the project has jsconfig.json but it is Javascript, not Typescript, type of project.

---

Edit: It just happen again in the aforementioned project, so it should be it.

[RyanCavanaugh]

@mjbvz ported to 3.8 branch 👍