t-t-t-action-replay-2.js

let eventDispatcher = function() {
    let replaying = false;
    let events = [];
    let subscribers = {};
    let dispatchEvent = (ev) => {
        if (!replaying) { 
            events.push(ev);
        }

        for (const sub of subscribers[ev.name]) {
            sub(ev);
        } 
    }

    let subscribe = (eventName, f) => {
        if(subscribers[eventName]) {
            subscribers[eventName].push(f);
        } else {
            subscribers[eventName] = [f];
        }
    }

    let replay = () => {
        replaying = true;
        let i = 1 
        for (const ev of events) {
            setTimeout(() => dispatchEvent(ev), 1000 * i);
            i++;
        }
        setTimeout(() => replaying = false, 1000 * events.length)
    }

    return {
        dispatch: dispatchEvent,
        subscribe: subscribe,
        replay: replay
    }
}();