Traverse all object properties recursively.

traverse_object_props.ts

private traverse(obj: any, interatee: Funcion) {
    for (var i in obj) {
        func.apply(this, [i, obj[i]]);
        if (obj[i] !== null && typeof (obj[i]) == "object") {
            this.traverse(obj[i], iteratee);
        }
    }
}