net: refactor check for Windows

PR-URL: #33497
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: rickyes

lib/net.js

@@ -119,6 +119,8 @@ const { kTimeout } = require('internal/timers');
 constDEFAULT_IPV4_ADDR='0.0.0.0';
 constDEFAULT_IPV6_ADDR='::';
 
+constisWindows=process.platform==='win32';
+
 functionnoop(){}
 
 functiongetFlags(ipv6Only){
@@ -335,8 +337,7 @@ function Socket(options) {
 this[async_id_symbol]=this._handle.getAsyncId();
 
 if((fd===1||fd===2)&&
-(this._handleinstanceofPipe)&&
-process.platform==='win32'){
+(this._handleinstanceofPipe)&&isWindows){
 // Make stdout and stderr blocking on Windows
 err=this._handle.setBlocking(true);
 if(err)
@@ -1024,7 +1025,7 @@ function lookupAndConnect(self, options) {
 hints: options.hints||0
 };
 
-if(process.platform!=='win32'&&
+if(!isWindows&&
 dnsopts.family!==4&&
 dnsopts.family!==6&&
 dnsopts.hints===0){
@@ -1227,7 +1228,7 @@ function createServerHandle(address, port, addressType, fd, flags) {
 assert(!address&&!port);
 }elseif(port===-1&&addressType===-1){
 handle=newPipe(PipeConstants.SERVER);
-if(process.platform==='win32'){
+if(isWindows){
 constinstances=parseInt(process.env.NODE_PENDING_PIPE_INSTANCES);
 if(!NumberIsNaN(instances)){
 handle.setPendingInstances(instances);
@@ -1710,7 +1711,7 @@ Server.prototype.unref = function() {
 let_setSimultaneousAccepts;
 letwarnSimultaneousAccepts=true;
 
-if(process.platform==='win32'){
+if(isWindows){
 letsimultaneousAccepts;
 
 _setSimultaneousAccepts=function(handle){