stream: simplify isUint8Array helper

The fallback code is no longer used when exporting to readable-stream.

Refs: #29475

PR-URL: #29514
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

lib/stream.js

@@ -21,8 +21,6 @@
 
 'use strict';
 
-const { Object } = primordials;
-
 const { Buffer } = require('buffer');
 const pipeline = require('internal/streams/pipeline');
 const eos = require('internal/streams/end-of-stream');
@@ -43,27 +41,7 @@ Stream.finished = eos;
 // Backwards-compat with node 0.4.x
 Stream.Stream = Stream;
 
-// Internal utilities
-try {
-  const types = require('internal/util/types');
-  if (types && typeof types.isUint8Array === 'function') {
-    Stream._isUint8Array = types.isUint8Array;
-  } else {
-    // This throws for Node < 4.2.0 because there's no util binding and
-    // returns undefined for Node < 7.4.0.
-    // Please do not convert process.binding() to internalBinding() here.
-    // This is for compatibility with older versions when loaded as
-    // readable-stream.
-    Stream._isUint8Array = process.binding('util').isUint8Array;
-  }
-} catch (e) { // eslint-disable-line no-unused-vars
-}
-
-if (!Stream._isUint8Array) {
-  Stream._isUint8Array = function _isUint8Array(obj) {
-    return Object.prototype.toString.call(obj) === '[object Uint8Array]';
-  };
-}
+Stream._isUint8Array = require('internal/util/types').isUint8Array;
 
 const version = process.version.substr(1).split('.');
 if (version[0] === 0 && version[1] < 12) {