Environment

Node version: v22.11.0
npm version: v10.9.0
Local ESLint version: v9.14.0 (Currently used)
Global ESLint version: Not found
Operating System: linux 6.8.0-48-generic

What parser are you using?

Default (Espree)

What did you do?

export default [{rules: {"no-loop-func": 2}}];

const array = [5, 7, 8, 3];
let idx = 0;

while(array.some(elm => elm > idx))
  idx += 1;

What did you expect to happen?

No error reported as there are no unsafe references.

What actually happened?

An error was reported, citing the arrow function inside the condition of the while statement.

Link to Minimal Reproducible Example

https://eslint.org/play/#eyJ0ZXh0IjoiY29uc3QgYXJyYXkgPSBbNSwgNywgOCwgM107XG5sZXQgaWR4ID0gMDtcblxud2hpbGUoYXJyYXkuc29tZShlbG0gPT4gZWxtID4gaWR4KSlcbiAgaWR4ICs9IDE7XG4iLCJvcHRpb25zIjp7InJ1bGVzIjp7Im5vLWxvb3AtZnVuYyI6WyJlcnJvciJdfSwibGFuZ3VhZ2VPcHRpb25zIjp7InBhcnNlck9wdGlvbnMiOnsiZWNtYUZlYXR1cmVzIjp7fX19fX0=

Participation

• I am willing to submit a pull request for this issue.

Additional comments

Functions inside of the condition are evaluated once per loop and are thus safe to reference variables that are modified. This is a false positive.