/* simulate several turns */
template = "Actor %s performing action for %s time units (current time: %s)";
for (let i = 0; i < 20; i++) {
    const current = act_scheduler.next();

    const actionDuration = Math.ceil(ROT.RNG.getUniform() * 20);
    act_scheduler.setDuration(actionDuration);

    const padded = actionDuration.toString().lpad("0");
    SHOW(template.format(current, padded, act_scheduler.getTime()));
}

// Timing & scheduling / Engine / Asynchronous game engine
scheduler = new ROT.Scheduler.Simple();
let engine = new ROT.Engine(scheduler);
let output: any = [];

class Actor1 {
    constructor(public lives: number) { }

    act() {
        output.push(".");
        this.lives--;
        if (!this.lives) {
            scheduler.remove(actor1);
            engine.lock();              /* pause execution */
            setTimeout(unlock, 500);    /* wait for 500ms */
        }
    }
}

const unlock = () => {               /* called asynchronously */
    const actor2 = new Actor2();

    output = [];
    scheduler.add(actor2, false);       /* add second (non-repeating) actor */
    engine.unlock();                    /* continue execution */
    SHOW(output.join(""));
};

 act() {
     output.push(".");
     this.lives--;
     if (!this.lives) {
         scheduler.remove(actor1);
         engine.lock();              /* pause execution */
         setTimeout(unlock, 500);    /* wait for 500ms */
     }
 }