domain: do not import util for a simple type check

This removes `require('util')` from the `domain` module. There was
only a single simple type check used from the `util` module which
is now inlined instead.

PR-URL: #29825
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>

Author: BridgeAR

lib/domain.js

@@ -28,7 +28,6 @@
 
 const { Object, Reflect } = primordials;
 
-const util = require('util');
 const EventEmitter = require('events');
 const {
   ERR_DOMAIN_CALLBACK_NOT_AVAILABLE,
@@ -207,7 +206,7 @@ Domain.prototype.members = undefined;
 Domain.prototype._errorHandler = function(er) {
   var caught = false;
 
-  if (!util.isPrimitive(er)) {
+  if ((typeof er === 'object' && er !== null) || typeof er === 'function') {
     Object.defineProperty(er, 'domain', {
       configurable: true,
       enumerable: false,