stream: simplify uint8ArrayToBuffer helper

The fallback code is no longer used when exporting to readable-stream.
Refs: #29514
PR-URL: #30041Fixes: #30040
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Author: lpinca

lib/stream.js

@@ -21,9 +21,9 @@
 
 'use strict';
 
-const{ Buffer }=require('buffer');
 constpipeline=require('internal/streams/pipeline');
 consteos=require('internal/streams/end-of-stream');
+constinternalBuffer=require('internal/buffer');
 
 // Note: export Stream before Readable/Writable/Duplex/...
 // to avoid a cross-reference(require) issues
@@ -42,19 +42,8 @@ Stream.finished = eos;
 Stream.Stream=Stream;
 
 Stream._isUint8Array=require('internal/util/types').isUint8Array;
-
-try{
-constinternalBuffer=require('internal/buffer');
-Stream._uint8ArrayToBuffer=function_uint8ArrayToBuffer(chunk){
-returnnewinternalBuffer.FastBuffer(chunk.buffer,
-chunk.byteOffset,
-chunk.byteLength);
-};
-}catch(e){// eslint-disable-line no-unused-vars
-}
-
-if(!Stream._uint8ArrayToBuffer){
-Stream._uint8ArrayToBuffer=function_uint8ArrayToBuffer(chunk){
-returnBuffer.prototype.slice.call(chunk);
-};
-}
+Stream._uint8ArrayToBuffer=function_uint8ArrayToBuffer(chunk){
+returnnewinternalBuffer.FastBuffer(chunk.buffer,
+chunk.byteOffset,
+chunk.byteLength);
+};