src observer.ts

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  export interface ObservableInterface {
    attach(observer: ObserverInterface): void;
    detach(observer: ObserverInterface): void;
    notify(message: string): void;
}
 
export interface ObserverInterface {
    update(subject: ObservableInterface, message: string): void;
}
 
export abstract class Observable implements ObservableInterface {
    protected observers: ObserverInterface[] = [];
 
    public attach(observer: ObserverInterface): number {
        return this.observers.push(observer);
    }
 
    public detach(observer: ObserverInterface): ObserverInterface[] {
        const observerIndex = this.observers.indexOf(observer);
 
        return this.observers.splice(observerIndex, 1);
    }
 
    public notify(message: string): void {
        return this.observers.forEach((observer): void => observer.update(this, message));
    }
}