Fix params mutating by ref in constructors (#13)

* fix params mutating by ref in constructors

* v2.0.1

Author: yarikos

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "@elastic.io/amqp-rpc",
   "description": "RPC over RabbitMQ for Node.js",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "homepage": "http://elastic.io",
   "author": "elastic.io GmbH <[email protected]>",
   "main": "src/index.js",

package.json

@@ -15,7 +15,7 @@ class AMQPEndpoint {
   constructor(connection, params = {}) {
     this._connection = connection;
     this._channel = null;
-    this._params = params;
+    this._params = Object.assign({}, params);
   }
 
   /**

src/AMQPEndpoint.js

@@ -29,10 +29,10 @@ class AMQPEventsReceiver extends EventEmitter {
 
     this._connection = amqpConnection;
 
-    this._params = params;
-    params.queueName = params.queueName || '';
-    params.TTL = params.TTL || AMQPEventsReceiver.TTL;
-    this._queueName = params.queueName;
+    this._params = Object.assign({
+      queueName: ''
+    }, params);
+    this._queueName = this._params.queueName;
 
     this._channel = null;
   }

src/AMQPEventsReceiver.js

@@ -26,8 +26,9 @@ class AMQPEventsSender extends EventEmitter {
     super();
     this._connection = amqpConnection;
 
-    this._params = params;
-    params.TTL = params.TTL || AMQPEventsSender.TTL;
+    this._params = Object.assign({
+      TTL: AMQPEventsSender.TTL
+    }, params);
     this._queueName = params.queueName;
 
     this._channel = null;