Attributes from a MultiPass ID using TypeScript?

So this is how the code looks after using it:

@Function()
public reduceToInitialsColumns(tasks: ObjectSet<Task>): FunctionsMap<Task, string> {

    const map = new FunctionsMap<Task, string>();

    tasks.all().forEach(t => {

        map.set(t, '');

        if (t.assignee) {
            const user = Users.getUserById(t.assignee);

            const firstName = user?.firstName;
            const lastName = user?.lastName;

            if (firstName && lastName) {
                map.set(t, this.reduceToInitials(firstName, lastName));
            }
        }
    });

    return map;

}

Importing:

import { Users } from "@foundry/functions-api";

Thanks!