Instale o momento no Goole Dev Console
fetch('https://momentjs.com/downloads/moment.min.js')
.then(response => response.text())
.then(text => eval(text))
CoderHJ
fetch('https://momentjs.com/downloads/moment.min.js')
.then(response => response.text())
.then(text => eval(text))
function add(a, b=20) {
return a + b;
}