Sandbox::https://github.com/httpsgithu/engine/blob/master/src/core/events.js

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import { EventHandler } from './event-handler.js';

const events = {

/**

* @private

* @function

* @name events.attach

* @description Attach event methods 'on', 'off', 'fire', 'once' and 'hasEvent' to the

* target object.

* @param {object} target - The object to add events to.

* @returns {object} The target object.

* @example

* var obj = { };

* pc.events.attach(obj);

attach: function (target) {

const ev = events;

target._addCallback = ev._addCallback;

target.on = ev.on;

target.off = ev.off;

target.fire = ev.fire;

target.once = ev.once;

target.hasEvent = ev.hasEvent;

target._callbacks = { };

target._callbackActive = { };

return target;

_addCallback: EventHandler.prototype._addCallback,

on: EventHandler.prototype.on,

off: EventHandler.prototype.off,

fire: EventHandler.prototype.fire,

once: EventHandler.prototype.once,

hasEvent: EventHandler.prototype.hasEvent

};

export { events };