fix: respect resolve.preserveSymlinks when resolving root (fix #23197)

packages/vite/src/node/__tests__/config.spec.ts

@@ -2017,6 +2017,41 @@ describe('loadConfigFromFile', () => {
   })
 })
 
+describe('root resolution', () => {
+  const tmpBase = path.join(os.tmpdir(), 'vite-root-test')
+
+  afterEach(() => {
+    if (fs.existsSync(tmpBase)) {
+      fs.rmSync(tmpBase, { recursive: true, force: true })
+    }
+  })
+
+  test('resolves a symlinked root to its real path', async () => {
+    const realDir = path.join(tmpBase, 'realpath', 'real')
+    const linkDir = path.join(tmpBase, 'realpath', 'link')
+    fs.mkdirSync(realDir, { recursive: true })
+    fs.symlinkSync(realDir, linkDir, 'junction')
+
+    const config = await resolveConfig({ root: linkDir }, 'serve')
+
+    expect(config.root).toBe(normalizePath(fs.realpathSync.native(realDir)))
+  })
+
+  test('keeps a symlinked root when resolve.preserveSymlinks is true', async () => {
+    const realDir = path.join(tmpBase, 'preserve-symlinks', 'real')
+    const linkDir = path.join(tmpBase, 'preserve-symlinks', 'link')
+    fs.mkdirSync(realDir, { recursive: true })
+    fs.symlinkSync(realDir, linkDir, 'junction')
+
+    const config = await resolveConfig(
+      { root: linkDir, resolve: { preserveSymlinks: true } },
+      'serve',
+    )
+
+    expect(config.root).toBe(normalizePath(linkDir))
+  })
+})
+
 describe('resolveServerOptions', () => {
   const warnFn = vi.fn()
   const logger = { warn: warnFn } as unknown as Logger

packages/vite/src/node/config.ts

@@ -1600,9 +1600,11 @@ export async function resolveConfig(
   let nonNormalizedResolvedRoot = config.root
     ? path.resolve(config.root)
     : process.cwd()
-  try {
-    nonNormalizedResolvedRoot = safeRealpathSync(nonNormalizedResolvedRoot)
-  } catch {}
+  if (!config.resolve?.preserveSymlinks) {
+    try {
+      nonNormalizedResolvedRoot = safeRealpathSync(nonNormalizedResolvedRoot)
+    } catch {}
+  }
   const resolvedRoot = normalizePath(nonNormalizedResolvedRoot)
 
   checkBadCharactersInPath(