False positive for error: TS2873: This kind of expression is always falsy.

[dasa]

🔎 Search Terms

"TS2873"

🕗 Version & Regression Information

Tested in 5.6.0-beta and 5.6.0-dev.20240801

⏯ Playground Link

https://www.typescriptlang.org/play/?ts=5.6.0-dev.20240801#code/DYUwLgBAbghsCuIBcEYDsCeEC8E32GAG4AoEgYwHs0BnS0AOmEoHMAKN2BECAH14jw0AExAAzAJZoQwgJQQAZAogBGCAHpocRLKIbNAWgB8gkeKkyK1Oo2bsuiRcrWaHIXfojG8BYCSA

💻 Code

let value: any = null;

console.log((value || undefined) && 1 / value); // -> undefined
console.log(value && 1 / value); // -> null

🙁 Actual behavior

"TS2873: This kind of expression is always falsy." is reported for undefined in the first log call.

🙂 Expected behavior

No error since undefined is affecting the behavior. Without undefined the expression evaluates to null.

Additional information about the issue

No response