pub sub for events

pubsub.ts

class Channel<T> {
    private subscribers : Subscriber<T>[] = [];
    private values : T[] = [];
    public emit(value : T) 
    {
       this.values.push(value);
    }
    public notify() 
    {
       for(const sub of this.subscribers)
       {
           sub.update(this.values)
       } 
    }
    public addSubscriber(sub : Subscriber<T>) 
    {
        this.subscribers.push(sub)
    }

}

class Subscriber<T> {
    values : T[] = []
    public update(vals : T[]) {
        this.values = vals;        
    }
    public listen(cb : (value : T) => void) {
        for(const val of this.values)
        {
            cb(val)
        }
    }
    
}


const sub = new Subscriber<Record<string, string>>();
const channel = new Channel<Record<string, string>>();
channel.addSubscriber(sub);

const pingApi = setInterval(() => {
    fetch('https://api.chucknorris.io/jokes/random')
    .then(res => res.json())
    .then(json => { 
      channel.emit(json);
      channel.notify();
    });
  }, 500);

sub.listen((joke: Record<string, string>) => {
  console.log(joke.value)
})