Appolo Event Dispatcher

Fast and simple event dispatcher for node.js written in typescript.

Installation:

npm install @appolo/events --save

Usage:

import {EventDispatcher} from "appolo-event-dispatcher";
 
class EventHandler extends EventDispatcher {
    constructor() {
        super();
        setTimeout(() => this.fireEvent("test", "some value"), 100)
    }
}

let eventHandler = new EventHandler();

eventHandler.on("test", (value)=>{
        //do something
});

eventHandler.once("test", (value)=>{
        //do something
});

//or with promise
let value  = await eventHandler.once("test");

API

on(event,callback,[scope])

add an event listener

• event - event name.
• callback - callback function that will triggered on event name.
• scope - optional, the scope of the callback function default: this.

once(event,[callback],[scope])

add an event listener will be called only once if no callback passed a promise will be returned

• event - event name.
• callback - callback function that will triggered on event name.
• scope - optional, the scope of the callback function default: this.

un(event,callback,[scope])

remove an event listener. All the arguments must be === to the onces used in the on method, or else it won`t be removed.

• event - event name.
• callback - callback function.
• scope - optional, the scope of the callback function.

fireEvent(event,[arguments])

fireEvent - triggers the callback functions of a given event name

• eventName - name of the event
• arguments - all other arguments will be passed to the callback function

removeAllListeners()

removes all event listeners

removeListenersByScope(scope)

removes all event listeners by given scope

hasListener(event,callback,[scope]):boolean

return true if listener exists

License

MIT