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In that case you might as well put your original code in the IIF, it would work.
There are a lot of ways to handle this, if your IIF returns a object, you could define ‘i’ and numLog inside the function and after that return them, like so:

var css_tricks = (function () {
    var i = 0;
    //some code

    function numLog() {
        return i;

    return {
        numLog: numLog

var timerId = setTimeout(function loop(){
    var i = css_tricks.numLog();
    timerId = setTimeout(loop, 100)
    if(i === 20) {
}, 100) 

It pretty much depends on the effect you are trying to achieve.