Interval

var requireAvailable = setInterval(checkMailChimpLoaded, 125);

function checkMailChimpLoaded ()
{
    if (typeof require !== "undefined") {
        require(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us17.list-manage.com","uuid":"7e0c3a0ea82288570dd89c5e3","lid":"f1393160ee"}) });

        clearInterval(requireAvailable);
    }
}