run-notifier

Allows you to notify listeners.

Install with npm:

npm:

npm install run-notifier --save

How to use

import {Notifier} from "run-notifier";

const listener1 = (params: string) => console.log('listener 1.', params);
const listener2 = (params: string) => console.log('listener 2.', params);

const notifier: Notifier<string> = new Notifier();

notifier.addListener(listener1);
notifier.addListener(listener2);
notifier.signal('test A');
// console --->>> listener 1. test A
// console --->>> listener 2. test A
notifier.removeListener(listener1);
notifier.removeListener(listener2);

// or

notifier.addListener('listener1', listener1);
notifier.addListener('listener2', listener2);
notifier.signal('test B');
// console --->>> listener 1. test B
// console --->>> listener 2. test B
notifier.removeListener('listener1');
notifier.removeListener('listener2');

// or

notifier.addListener('listener1', listener2);
notifier.addListener('listener1', listener1); // replace listener with same key
notifier.addListener('listener2', listener2);
notifier.signal('test C');
// console --->>> listener 1. test C
// console --->>> listener 2. test C
notifier.removeListener('listener1');
notifier.removeListener('listener2');

Doc

/**
 * Notifier. Allows you to notify listeners.
 */
class Notifier<Params> {
    /**
     * Called before adding the first notification listener.
     * Used to initialize any activity in inheritor.
     */
    protected onStart(): void;

    /**
     * Called after removing the last notification listener.
     * Used to finalize any activity in inheritor.
     */
    protected onStop(): void;

    /**
     * Add notification listener.
     *
     * @param listener Listener;
     * @param notice Handler. Called on listener notification;
     * @param extra Additional arguments.
     */
    public addListener(listener: NotifierListener<Params>, notice?: NotifierNotice<Params>, ...extra: any): void;

    /**
     * Remove all notification listeners.
     */
    public clear(): void;

    /**
     * Remove notification listener.
     *
     * @param listener Listener.
     */
    public removeListener(listener: NotifierListener<Params>): void;

    /**
     * Notify listeners.
     *
     * @param params Notification parameters.
     */
    public signal(params: Params): void;
}

License

MIT. Copyright (c) 2021 Vitaliy Dyukar.