TS Server fatal error: Debug Failure. False expression.

[thedomi]

TypeScript Version: 3.8.3
Steps to reproduce crash

1. Happends every time I open VSCode.

TS Server Error Stack

Error: Debug Failure. False expression.
    at ProjectService.applyChangesInOpenFiles (tsserver.js:143381:34)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:144260:46)
    at tsserver.js:146003:88
    at IOSession.Session.executeWithRequestId (tsserver.js:145994:28)
    at IOSession.Session.executeCommand (tsserver.js:146003:33)
    at IOSession.Session.onMessage (tsserver.js:146027:35)
    at Interface.<anonymous> (tsserver.js:147342:27)
    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)

[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. (#96093)
• TS Server fatal error: Debug Failure. False expression. (#96188)
• TS Server fatal error: Debug Failure. False expression. (#93698)
• TS Server fatal error: Debug Failure. False expression. (#94690)
• TS Server fatal error: Debug Failure. False expression. (#93285)

[mjbvz]

Does this reproduce in the latest VS Code insiders build (1.46)?

[mjbvz]

Also, duplicate of microsoft/TypeScript#38076

This should be fixed in VS Code 1.46

[thedomi]

Thanks @mjbvz . I've downloaded v 1.46 and the issue is still there. Do you need any other info on this issue (e.g., what's in microsoft/TypeScript#38076 (comment))?

[mjbvz]

Yes please share the error you are seeing when using TypeScript 3.9.3+ (this is the version of TypeScript shipped in VS Code insiders)

[thedomi]

@mjbvz, I might have found the problem.

Our project contains hundreds of .ts files (MPEG2 Transport Stream files, not TypeScript). I noticed that these were listed in the tsserver.log file (I started sanitizing the tsserver.log file as it contains code pieces from our project).

Adding the folder with the MPEG2 Transport Stream files to tsconfig.json -> exclude solved the problem.

Thank you for your help with this.

[mjbvz]

Thank you for investigating this!

Oddly you are not the first person to hit this issue: microsoft/TypeScript#21136

I'll close this as upstream. Please upvote the upstream issue too