fixup! fixup! event: simplify domain conditions

Author: Trott

lib/events.js

@@ -335,23 +335,21 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
   } else if (!doError)
     return false;
 
-  const domain = this.domain;
-
   // If there is no 'error' event listener then throw.
   if (doError) {
     let er;
     if (args.length > 0)
       er = args[0];
-    if (domain) {
+    if (this.domain) {
       if (!er) {
         er = new ERR_UNHANDLED_ERROR();
       }
       if (typeof er === 'object') {
         er.domainEmitter = this;
-        er.domain = domain;
+        er.domain = this.domain;
         er.domainThrown = false;
       }
-      domain.emit('error', er);
+      this.domain.emit('error', er);
     } else if (er instanceof Error) {
       try {
         const capture = {};
@@ -389,8 +387,8 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
     return false;
 
   let needDomainExit = false;
-  if (domain && this !== process) {
-    domain.enter();
+  if (this.domain && this !== process) {
+    this.domain.enter();
     needDomainExit = true;
   }
 
@@ -421,7 +419,7 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
   }
 
   if (needDomainExit)
-    domain.exit();
+    this.domain.exit();
 
   return true;
 };