plain-observable/lib/types/observer.d.ts

A simple implementation of observable pattern

export interface IObserver {
    update(state: any): void;
}
export declare class ObserversList {
    private observers;
    get size(): number;
    add(obs: IObserver): void;
    remove(obs: IObserver): void;
    indexOf(obs: IObserver): number;
    get(index: number): IObserver;
}