[xlm1717]

I wonder what performance gains/losses you would experience if you had the comment outside the function block, before the function declaration.

[STRML]

Exactly, if the comment were outside the function, there would be no issue.

[WorldWideWayne]

If the function is nested within another function, then the comments to document the inner function are going to exist inside the outer function. And having nested functions is a very common scenario in JS.