Inputmask oncomplete without JQuery

Question

I set mask:

<input class="form-control" type="text" data-inputmask="'alias': 'email'">

and call inputmask for multiple elements:

let els = document.querySelectorAll("input");
Inputmask().mask(els);

How I can set oncomplete event after? I try like this:

for (let i = 0; i < els.length; i++) {
    els[i].inputmask['events']['oncomplete'] = function() {
        console.log('Uuuu')
    };
}

But it's not work :(

Code: JSFiddle