Completions error when completing a string in parentheses

[DanielRosenwasser]

declare let x: "foo" | "bar";

switch (x) {
    case ("/**/")
}

Request completions at /**/.

Expected: string literals "foo" and "bar" should be provided as completion items.
Actual: Error!

TypeError: clauses is not iterable
    at newCaseClauseTracker (tsserver.js:130163:24)
    at getStringLiteralCompletionEntries (tsserver.js:151930:23)
    at Object.getStringLiteralCompletions (tsserver.js:151741:21)
    at Object.getCompletionsAtPosition (tsserver.js:148418:70)
    at Object.getCompletionsAtPosition2 [as getCompletionsAtPosition] (tsserver.js:135546:35)
    at IpcIOSession.getCompletions (tsserver.js:179105:54)
    at completionInfo (tsserver.js:177516:43)
    at tsserver.js:179869:69
    at IpcIOSession.executeWithRequestId (tsserver.js:179861:14)
    at IpcIOSession.executeCommand (tsserver.js:179869:29)
    at IpcIOSession.onMessage (tsserver.js:179911:51)
    at process.<anonymous> (tsserver.js:181479:14)

Found on mattermost/focalboard in this crawler run.

https://github.com/mattermost/focalboard/blob/6576d75192de418ff73a460740ee777de75cab8d/webapp/src/components/calculations/calculations.ts#L21-L37

[Andarist]

I have a fix for the crash locally, still looking into fixing actual completions for this case though. Gonna put up a PR for this later today.

[DanielRosenwasser]

Thanks @Andarist!