Here is a pattern that will ensure "new" is called when defining an object constructor. When calling a JavaScript constructor function, if "new" is not used, then the variable being assigned will be undefined unless the constructor function returns something else.
function Griffen(name){
this.name = name;
if(this instanceof Griffen){
return;
}
return new Griffen(name)
}
console.log(Griffen("Pete"));