Wrong error message for testing `void` with `??`

🔎 Search Terms

nullish An expression of type 'void' cannot be tested for truthiness.

(there are many closed issues with these search term, but they are all from people confused by why this is an error in the first place)

🕗 Version & Regression Information

• This is the behavior in every version I tried

⏯ Playground Link

https://www.typescriptlang.org/play?ts=5.3.3#code/CYUwxgNghgTiAEA3W8oC4kHsCWwDcAUAVPAPynwBmUEAziHkA

💻 Code

declare var a: void;

a ?? false;

🙁 Actual behavior

It reports "An expression of type 'void' cannot be tested for truthiness."

🙂 Expected behavior

The error message should not mention truthiness, since I'm not testing for truthiness. nullishness? :P

Additional information about the issue

No response

Beginne damit, das Problem im verlinkten TypeScript Playground anhand des bereitgestellten void- und ??-Beispiels zu reproduzieren. Verfolge die Diagnose, die „An expression of type 'void' cannot be tested for truthiness“ erzeugt; fertig ist die Aufgabe, wenn sich die Meldung bei der Berichterstattung über diesen Nullishness-Fehler nicht mehr auf Truthiness bezieht.