chore: release 3.4.2

Diff: 3.4.1...3.4.2

Author: darrachequesne

CHANGELOG.md

@@ -1,3 +1,7 @@
+## [3.4.2](https://github.com/socketio/engine.io-client/compare/3.4.1...3.4.2) (2020-05-13)
+
+
+
 ## [3.4.1](https://github.com/socketio/engine.io-client/compare/3.4.0...3.4.1) (2020-04-17)
 
 

engine.io.js

@@ -3101,6 +3101,13 @@ return /******/ (function(modules) { // webpackBootstrap
 	      break;
 	    }
 	  }
+
+	  // Remove event specific arrays for event types that no
+	  // one is subscribed for to avoid memory leak.
+	  if (callbacks.length === 0) {
+	    delete this._callbacks['$' + event];
+	  }
+
 	  return this;
 	};
 
@@ -3114,9 +3121,14 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	Emitter.prototype.emit = function(event){
 	  this._callbacks = this._callbacks || {};
-	  var args = [].slice.call(arguments, 1)
+
+	  var args = new Array(arguments.length - 1)
 	    , callbacks = this._callbacks['$' + event];
 
+	  for (var i = 1; i < arguments.length; i++) {
+	    args[i - 1] = arguments[i];
+	  }
+
 	  if (callbacks) {
 	    callbacks = callbacks.slice(0);
 	    for (var i = 0, len = callbacks.length; i < len; ++i) {

package-lock.json

@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "3.4.1",
+  "version": "3.4.2",
   "main": "lib/index.js",
   "homepage": "https://github.com/socketio/engine.io-client",
   "contributors": [