fix(tools): handle mixed-separator cwd on Windows in snap test output replacement (#707)

On Windows, cwd built with template literals has mixed separators
(e.g., `C:\Users\...\Temp/test-name`) while Vite's error messages use
all-backslash paths from path.resolve(). The cwd replacement in
replaceUnstableOutput() failed to match, leaking full temp paths into
snap test output.

Fix by also trying the all-backslash form of cwd (and its parent) for
replacement, with trailing-separator handling to normalize the path
separator after the `<cwd>` placeholder.

Author: fengmk2

packages/tools/src/__tests__/utils.spec.ts

@@ -101,6 +101,38 @@ Done in 171ms using pnpm v10.16.1
     expect(replaceUnstableOutput(output.trim(), cwd)).toMatchSnapshot();
   });
 
+  describe.skipIf(process.platform !== 'win32')('Windows cwd replacement', () => {
+    test('mixed-separator cwd matches all-backslash output', () => {
+      // Simulates the CI failure: cwd has mixed separators (template literal),
+      // but Vite outputs all-backslash paths (path.resolve)
+      const cwd =
+        'C:\\Users\\RUNNER~1\\AppData\\Local\\Temp/vite-plus-test-abc/command-staged-broken-config';
+      const output =
+        'failed to load config from C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\vite-plus-test-abc\\command-staged-broken-config\\vite.config.ts';
+      expect(replaceUnstableOutput(output, cwd)).toBe(
+        'failed to load config from <cwd>/vite.config.ts',
+      );
+    });
+
+    test('all-backslash cwd matches all-backslash output', () => {
+      const cwd = 'C:\\Users\\runner\\project';
+      const output = 'error in C:\\Users\\runner\\project\\src\\main.ts';
+      expect(replaceUnstableOutput(output, cwd)).toBe('error in <cwd>/src/main.ts');
+    });
+
+    test('cwd at end of string without trailing separator', () => {
+      const cwd = 'C:\\Users\\runner\\project';
+      const output = 'path is C:\\Users\\runner\\project';
+      expect(replaceUnstableOutput(output, cwd)).toBe('path is <cwd>');
+    });
+
+    test('parent directory replacement with backslash paths', () => {
+      const cwd = 'C:\\Users\\RUNNER~1\\Temp/vite-plus-test/my-test';
+      const output = 'found C:\\Users\\RUNNER~1\\Temp\\vite-plus-test\\other\\file.ts';
+      expect(replaceUnstableOutput(output, cwd)).toBe('found <cwd>/../other/file.ts');
+    });
+  });
+
   test('replace tsdown output', () => {
     const output = `
 ℹ tsdown v0.15.1 powered by rolldown v0.15.1

packages/tools/src/utils.ts

@@ -14,9 +14,22 @@ export function replaceUnstableOutput(output: string, cwd?: string) {
   output = output.replaceAll(ANSI_ESCAPE_REGEX, '').replaceAll(/\r\n/g, '\n').replaceAll(/\r/g, '');
 
   if (cwd) {
-    output = output.replaceAll(cwd, '<cwd>');
-    if (path.dirname(cwd) !== '/') {
-      output = output.replaceAll(path.dirname(cwd), '<cwd>/..');
+    // On Windows, cwd may have mixed separators (from template literals like `${tmp}/name`)
+    // while output uses all-backslash paths (from path.resolve()). Replace the all-backslash
+    // form of each path token, with trailing separator first so the separator after the
+    // placeholder is normalized to forward slash.
+    const replacePathToken = (rawPath: string, placeholder: string) => {
+      if (process.platform === 'win32') {
+        const backslash = rawPath.replaceAll('/', '\\');
+        output = output.replaceAll(backslash + '\\', placeholder + '/');
+        output = output.replaceAll(backslash, placeholder);
+      }
+      output = output.replaceAll(rawPath, placeholder);
+    };
+    replacePathToken(cwd, '<cwd>');
+    const parent = path.dirname(cwd);
+    if (parent !== '/') {
+      replacePathToken(parent, '<cwd>/..');
     }
   }
   // On Windows, normalize path separators in file paths for consistent snapshots.