fix: "EISDIR: illegal operation on a directory, realpath" error on RA…

packages/vite/src/node/utils.ts

@@ -571,32 +571,22 @@ export function copyDir(srcDir: string, destDir: string): void {
   }
 }
 
-/**
- * Wrapper to prevent `fs.realpathSync.native` errors in Windows virtual and RAM disks
- * that bypass the Volume Mount Manager, in programs such as imDisk
- * @param path - a path to a file
- * @returns {string}
- */
-function wrapRealpathSyncNative(path: string): string {
-  try {
-    return fs.realpathSync.native(path)
-  } catch {
-    return fs.realpathSync(path)
-  }
-}
-
 // `fs.realpathSync.native` resolves differently in Windows network drive,
 // causing file read errors. skip for now.
 // https://github.com/nodejs/node/issues/37737
 export let safeRealpathSync = isWindows
   ? windowsSafeRealPathSync
   : fs.realpathSync.native
 
+// when using `fs.realpathSync.native` get errors in Windows virtual and RAM disks
+// that bypass the Volume Mount Manager, in programs such as imDisk
+let supportedRealpathSync = fs.realpathSync.native
+
 // Based on https://github.com/larrybahr/windows-network-drive
 // MIT License, Copyright (c) 2017 Larry Bahr
 const windowsNetworkMap = new Map()
 function windowsMappedRealpathSync(path: string) {
-  const realPath = wrapRealpathSyncNative(path)
+  const realPath = supportedRealpathSync(path)
   if (realPath.startsWith('\\\\')) {
     for (const [network, volume] of windowsNetworkMap) {
       if (realPath.startsWith(network)) return realPath.replace(network, volume)
@@ -622,7 +612,16 @@ function optimizeSafeRealPathSync() {
     safeRealpathSync = fs.realpathSync
     return
   }
-
+  // Check the availability `fs.realpathSync.native`
+  // in Windows virtual and RAM disks that bypass the Volume Mount Manager
+  // get the error EISDIR: illegal operation on a directory
+  try {
+    fs.realpathSync.native(path.resolve('./'))
+  } catch (error) {
+    if (~error.message.indexOf('EISDIR: illegal operation on a directory')) {
+      supportedRealpathSync = fs.realpathSync
+    }
+  }
   exec('net use', (error, stdout) => {
     if (error) return
     const lines = stdout.split('\n')
@@ -633,7 +632,7 @@ function optimizeSafeRealPathSync() {
       if (m) windowsNetworkMap.set(m[3], m[2])
     }
     if (windowsNetworkMap.size === 0) {
-      safeRealpathSync = wrapRealpathSyncNative
+      safeRealpathSync = supportedRealpathSync
     } else {
       safeRealpathSync = windowsMappedRealpathSync
     }