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Filename : eventemitter3.umd.js
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(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.EventEmitter3 = factory());
})(this, (function () { 'use strict';

  var eventemitter3Exports = {};
  var eventemitter3$1 = {
    get exports(){ return eventemitter3Exports; },
    set exports(v){ eventemitter3Exports = v; },
  };

  (function (module) {

  	var has = Object.prototype.hasOwnProperty
  	  , prefix = '~';

  	/**
  	 * Constructor to create a storage for our `EE` objects.
  	 * An `Events` instance is a plain object whose properties are event names.
  	 *
  	 * @constructor
  	 * @private
  	 */
  	function Events() {}

  	//
  	// We try to not inherit from `Object.prototype`. In some engines creating an
  	// instance in this way is faster than calling `Object.create(null)` directly.
  	// If `Object.create(null)` is not supported we prefix the event names with a
  	// character to make sure that the built-in object properties are not
  	// overridden or used as an attack vector.
  	//
  	if (Object.create) {
  	  Events.prototype = Object.create(null);

  	  //
  	  // This hack is needed because the `__proto__` property is still inherited in
  	  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
  	  //
  	  if (!new Events().__proto__) prefix = false;
  	}

  	/**
  	 * Representation of a single event listener.
  	 *
  	 * @param {Function} fn The listener function.
  	 * @param {*} context The context to invoke the listener with.
  	 * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
  	 * @constructor
  	 * @private
  	 */
  	function EE(fn, context, once) {
  	  this.fn = fn;
  	  this.context = context;
  	  this.once = once || false;
  	}

  	/**
  	 * Add a listener for a given event.
  	 *
  	 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
  	 * @param {(String|Symbol)} event The event name.
  	 * @param {Function} fn The listener function.
  	 * @param {*} context The context to invoke the listener with.
  	 * @param {Boolean} once Specify if the listener is a one-time listener.
  	 * @returns {EventEmitter}
  	 * @private
  	 */
  	function addListener(emitter, event, fn, context, once) {
  	  if (typeof fn !== 'function') {
  	    throw new TypeError('The listener must be a function');
  	  }

  	  var listener = new EE(fn, context || emitter, once)
  	    , evt = prefix ? prefix + event : event;

  	  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;
  	  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);
  	  else emitter._events[evt] = [emitter._events[evt], listener];

  	  return emitter;
  	}

  	/**
  	 * Clear event by name.
  	 *
  	 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
  	 * @param {(String|Symbol)} evt The Event name.
  	 * @private
  	 */
  	function clearEvent(emitter, evt) {
  	  if (--emitter._eventsCount === 0) emitter._events = new Events();
  	  else delete emitter._events[evt];
  	}

  	/**
  	 * Minimal `EventEmitter` interface that is molded against the Node.js
  	 * `EventEmitter` interface.
  	 *
  	 * @constructor
  	 * @public
  	 */
  	function EventEmitter() {
  	  this._events = new Events();
  	  this._eventsCount = 0;
  	}

  	/**
  	 * Return an array listing the events for which the emitter has registered
  	 * listeners.
  	 *
  	 * @returns {Array}
  	 * @public
  	 */
  	EventEmitter.prototype.eventNames = function eventNames() {
  	  var names = []
  	    , events
  	    , name;

  	  if (this._eventsCount === 0) return names;

  	  for (name in (events = this._events)) {
  	    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
  	  }

  	  if (Object.getOwnPropertySymbols) {
  	    return names.concat(Object.getOwnPropertySymbols(events));
  	  }

  	  return names;
  	};

  	/**
  	 * Return the listeners registered for a given event.
  	 *
  	 * @param {(String|Symbol)} event The event name.
  	 * @returns {Array} The registered listeners.
  	 * @public
  	 */
  	EventEmitter.prototype.listeners = function listeners(event) {
  	  var evt = prefix ? prefix + event : event
  	    , handlers = this._events[evt];

  	  if (!handlers) return [];
  	  if (handlers.fn) return [handlers.fn];

  	  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
  	    ee[i] = handlers[i].fn;
  	  }

  	  return ee;
  	};

  	/**
  	 * Return the number of listeners listening to a given event.
  	 *
  	 * @param {(String|Symbol)} event The event name.
  	 * @returns {Number} The number of listeners.
  	 * @public
  	 */
  	EventEmitter.prototype.listenerCount = function listenerCount(event) {
  	  var evt = prefix ? prefix + event : event
  	    , listeners = this._events[evt];

  	  if (!listeners) return 0;
  	  if (listeners.fn) return 1;
  	  return listeners.length;
  	};

  	/**
  	 * Calls each of the listeners registered for a given event.
  	 *
  	 * @param {(String|Symbol)} event The event name.
  	 * @returns {Boolean} `true` if the event had listeners, else `false`.
  	 * @public
  	 */
  	EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
  	  var evt = prefix ? prefix + event : event;

  	  if (!this._events[evt]) return false;

  	  var listeners = this._events[evt]
  	    , len = arguments.length
  	    , args
  	    , i;

  	  if (listeners.fn) {
  	    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);

  	    switch (len) {
  	      case 1: return listeners.fn.call(listeners.context), true;
  	      case 2: return listeners.fn.call(listeners.context, a1), true;
  	      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
  	      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
  	      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
  	      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
  	    }

  	    for (i = 1, args = new Array(len -1); i < len; i++) {
  	      args[i - 1] = arguments[i];
  	    }

  	    listeners.fn.apply(listeners.context, args);
  	  } else {
  	    var length = listeners.length
  	      , j;

  	    for (i = 0; i < length; i++) {
  	      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);

  	      switch (len) {
  	        case 1: listeners[i].fn.call(listeners[i].context); break;
  	        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
  	        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
  	        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
  	        default:
  	          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
  	            args[j - 1] = arguments[j];
  	          }

  	          listeners[i].fn.apply(listeners[i].context, args);
  	      }
  	    }
  	  }

  	  return true;
  	};

  	/**
  	 * Add a listener for a given event.
  	 *
  	 * @param {(String|Symbol)} event The event name.
  	 * @param {Function} fn The listener function.
  	 * @param {*} [context=this] The context to invoke the listener with.
  	 * @returns {EventEmitter} `this`.
  	 * @public
  	 */
  	EventEmitter.prototype.on = function on(event, fn, context) {
  	  return addListener(this, event, fn, context, false);
  	};

  	/**
  	 * Add a one-time listener for a given event.
  	 *
  	 * @param {(String|Symbol)} event The event name.
  	 * @param {Function} fn The listener function.
  	 * @param {*} [context=this] The context to invoke the listener with.
  	 * @returns {EventEmitter} `this`.
  	 * @public
  	 */
  	EventEmitter.prototype.once = function once(event, fn, context) {
  	  return addListener(this, event, fn, context, true);
  	};

  	/**
  	 * Remove the listeners of a given event.
  	 *
  	 * @param {(String|Symbol)} event The event name.
  	 * @param {Function} fn Only remove the listeners that match this function.
  	 * @param {*} context Only remove the listeners that have this context.
  	 * @param {Boolean} once Only remove one-time listeners.
  	 * @returns {EventEmitter} `this`.
  	 * @public
  	 */
  	EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
  	  var evt = prefix ? prefix + event : event;

  	  if (!this._events[evt]) return this;
  	  if (!fn) {
  	    clearEvent(this, evt);
  	    return this;
  	  }

  	  var listeners = this._events[evt];

  	  if (listeners.fn) {
  	    if (
  	      listeners.fn === fn &&
  	      (!once || listeners.once) &&
  	      (!context || listeners.context === context)
  	    ) {
  	      clearEvent(this, evt);
  	    }
  	  } else {
  	    for (var i = 0, events = [], length = listeners.length; i < length; i++) {
  	      if (
  	        listeners[i].fn !== fn ||
  	        (once && !listeners[i].once) ||
  	        (context && listeners[i].context !== context)
  	      ) {
  	        events.push(listeners[i]);
  	      }
  	    }

  	    //
  	    // Reset the array, or remove it completely if we have no more listeners.
  	    //
  	    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
  	    else clearEvent(this, evt);
  	  }

  	  return this;
  	};

  	/**
  	 * Remove all listeners, or those of the specified event.
  	 *
  	 * @param {(String|Symbol)} [event] The event name.
  	 * @returns {EventEmitter} `this`.
  	 * @public
  	 */
  	EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
  	  var evt;

  	  if (event) {
  	    evt = prefix ? prefix + event : event;
  	    if (this._events[evt]) clearEvent(this, evt);
  	  } else {
  	    this._events = new Events();
  	    this._eventsCount = 0;
  	  }

  	  return this;
  	};

  	//
  	// Alias methods names because people roll like that.
  	//
  	EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
  	EventEmitter.prototype.addListener = EventEmitter.prototype.on;

  	//
  	// Expose the prefix.
  	//
  	EventEmitter.prefixed = prefix;

  	//
  	// Allow `EventEmitter` to be imported as module namespace.
  	//
  	EventEmitter.EventEmitter = EventEmitter;

  	//
  	// Expose the module.
  	//
  	{
  	  module.exports = EventEmitter;
  	}
  } (eventemitter3$1));

  var eventemitter3 = eventemitter3Exports;

  return eventemitter3;

}));