From 9366d815c3daf1eef5d5039985e7e0ef8b11ac81 Mon Sep 17 00:00:00 2001
From: patak <matias.capeletto@gmail.com>
Date: Sat, 25 Mar 2023 15:58:29 +0100
Subject: [PATCH 1/3] perf: try using realpathSync.native in Windows

---
 packages/vite/src/node/utils.ts | 42 +++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/packages/vite/src/node/utils.ts b/packages/vite/src/node/utils.ts
index d1b3eb14cae7c8..5a8d51479bb950 100644
--- a/packages/vite/src/node/utils.ts
+++ b/packages/vite/src/node/utils.ts
@@ -1,6 +1,7 @@
 import fs from 'node:fs'
 import os from 'node:os'
 import path from 'node:path'
+import { exec } from 'node:child_process'
 import { createHash } from 'node:crypto'
 import { promisify } from 'node:util'
 import { URL, URLSearchParams } from 'node:url'
@@ -597,10 +598,47 @@ export const renameDir = isWindows ? promisify(gracefulRename) : fs.renameSync
 // `fs.realpathSync.native` resolves differently in Windows network drive,
 // causing file read errors. skip for now.
 // https://github.com/nodejs/node/issues/37737
-export const safeRealpathSync = isWindows
-  ? fs.realpathSync
+export let safeRealpathSync = isWindows
+  ? windowsSafeRealPathSync
   : 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 = fs.realpathSync.native(path)
+  if (realPath.startsWith('\\\\')) {
+    for (const [network, volume] of windowsNetworkMap) {
+      if (realPath.startsWith(network)) return realPath.replace(network, volume)
+    }
+  }
+  return realPath
+}
+const parseNetUseRE = /^(\w+) +(\w:) +([^ ]+)\s/
+let firstSafeRealPathSyncRun = false
+
+function windowsSafeRealPathSync(path: string): string {
+  if (!firstSafeRealPathSyncRun) {
+    optimizeSafeRealPathSync()
+    firstSafeRealPathSyncRun = false
+  }
+  return fs.realpathSync(path)
+}
+
+function optimizeSafeRealPathSync() {
+  exec('net use', (error, stdout) => {
+    if (error) return
+    const lines = stdout.split('\n')
+    // OK           Y:        \\NETWORKA\Foo         Microsoft Windows Network
+    // OK           Z:        \\NETWORKA\Bar         Microsoft Windows Network
+    for (const line of lines) {
+      const m = line.match(parseNetUseRE)
+      if (m) windowsNetworkMap.set(m[3], m[2])
+    }
+    safeRealpathSync = windowsMappedRealpathSync
+  })
+}
+
 export function ensureWatchedFile(
   watcher: FSWatcher,
   file: string | null,

From 9a6af8ee21ae6c8b6917c602c48902781ca54b0a Mon Sep 17 00:00:00 2001
From: sapphi-red <green@sapphi.red>
Date: Sun, 26 Mar 2023 17:18:28 +0900
Subject: [PATCH 2/3] fix: set `firstSafeRealPathSyncRun` correctly

Co-Authored-By: Bjorn Lu <bjorn@bjornlu.com>
---
 packages/vite/src/node/utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/vite/src/node/utils.ts b/packages/vite/src/node/utils.ts
index 5a8d51479bb950..e719278a10dfaf 100644
--- a/packages/vite/src/node/utils.ts
+++ b/packages/vite/src/node/utils.ts
@@ -620,7 +620,7 @@ let firstSafeRealPathSyncRun = false
 function windowsSafeRealPathSync(path: string): string {
   if (!firstSafeRealPathSyncRun) {
     optimizeSafeRealPathSync()
-    firstSafeRealPathSyncRun = false
+    firstSafeRealPathSyncRun = true
   }
   return fs.realpathSync(path)
 }

From 63217529154dc6dc53d5861a068e80a1aec0fdb3 Mon Sep 17 00:00:00 2001
From: sapphi-red <green@sapphi.red>
Date: Sun, 26 Mar 2023 17:19:20 +0900
Subject: [PATCH 3/3] perf: use `fs.realpath.native` directly when
 `windowsNetworkMap` is empty

Co-Authored-By: patak <583075+patak-dev@users.noreply.github.com>
---
 packages/vite/src/node/utils.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/vite/src/node/utils.ts b/packages/vite/src/node/utils.ts
index e719278a10dfaf..81d7e22bad6cf8 100644
--- a/packages/vite/src/node/utils.ts
+++ b/packages/vite/src/node/utils.ts
@@ -635,7 +635,11 @@ function optimizeSafeRealPathSync() {
       const m = line.match(parseNetUseRE)
       if (m) windowsNetworkMap.set(m[3], m[2])
     }
-    safeRealpathSync = windowsMappedRealpathSync
+    if (windowsNetworkMap.size === 0) {
+      safeRealpathSync = fs.realpathSync.native
+    } else {
+      safeRealpathSync = windowsMappedRealpathSync
+    }
   })
 }