chore: remove circular ref (#732)

Author: jimmywarting

lib/callback_model.js

@@ -5,7 +5,7 @@
 'use strict';
 
 var defs = require('./defs');
-var EventEmitter = require('events').EventEmitter;
+var EventEmitter = require('events');
 var BaseChannel = require('./channel').BaseChannel;
 var acceptMessage = require('./channel').acceptMessage;
 var Args = require('./api_args');

lib/channel.js

@@ -11,7 +11,7 @@ var closeMsg = require('./format').closeMessage;
 var inspect = require('./format').inspect;
 var methodName = require('./format').methodName;
 var assert = require('assert');
-var EventEmitter = require('events').EventEmitter;
+var EventEmitter = require('events');
 var fmt = require('util').format;
 var IllegalOperationError = require('./error').IllegalOperationError;
 var stackCapture = require('./error').stackCapture;

lib/connection.js

@@ -13,7 +13,7 @@ var Mux = require('./mux').Mux;
 var Duplex =
   require('stream').Duplex ||
   require('readable-stream/duplex');
-var EventEmitter = require('events').EventEmitter;
+var EventEmitter = require('events');
 var Heart = require('./heartbeat').Heart;
 
 var methodName = require('./format').methodName;

lib/heartbeat.js

@@ -47,7 +47,7 @@
 
 'use strict';
 
-var EventEmitter = require('events').EventEmitter;
+var EventEmitter = require('events');
 
 // Exported so that we can mess with it in tests
 module.exports.UNITS_TO_MS = 1000;