Does ES6 const affect garbage collection?

Question

In Kyle Simpson\'s new title, You don\'t know JS: ES6 and beyond, I find the following snippet:

WARNING Assigning an object or array as a constan

Answer 1

No, there are no performance implications. This note refers to the practise of helping the garbage collector (which is rarely enough needed) by "unsetting" the variable:

{
    let x = makeHeavyObject();
    window.onclick = function() {
        // this *might* close over `x` even when it doesn't need it
    };
    x = null; // so we better clear it
}

This is obviously not possibly to do if you had declared x as a const.

The lifetime of the variable (when it goes out of scope) is not affected by this. But if the garbage collector screws up, a constant will always hold the value it was initialised with, and prevent that from being garbage-collected as well, while a normal variable might no more hold it.