Fix glob pattern matching on Windows by normalizing path separators

.gitignore

@@ -5,3 +5,4 @@ packages/*/__tests__/_temp/
 .DS_Store
 *.xar
 packages/*/audit.json
+.nx/

packages/glob/__tests__/windows-path-matching.test.ts

@@ -0,0 +1,83 @@
+/**
+ * Test to validate that glob works correctly on Windows with backslash paths
+ * This test validates the fix for glob not working on GitHub's Windows runners
+ */
+
+import {MatchKind} from '../src/internal-match-kind'
+import {Pattern} from '../src/internal-pattern'
+
+const IS_WINDOWS = process.platform === 'win32'
+
+describe('Windows path matching', () => {
+  it('matches paths with backslashes on Windows', () => {
+    if (!IS_WINDOWS) {
+      // This test is only relevant on Windows
+      return
+    }
+
+    // Test basic pattern matching with Windows paths
+    const pattern = new Pattern('C:\\Users\\test\\*')
+
+    // The itemPath would come from fs.readdir with backslashes on Windows
+    const itemPath = 'C:\\Users\\test\\file.txt'
+
+    // This should match because the pattern and path both refer to the same file
+    expect(pattern.match(itemPath)).toBe(MatchKind.All)
+  })
+
+  it('partial matches work with backslashes on Windows', () => {
+    if (!IS_WINDOWS) {
+      return
+    }
+
+    // Test partial matching with Windows paths
+    const pattern = new Pattern('C:\\Users\\test\\**')
+
+    // Should partially match parent directory
+    expect(pattern.partialMatch('C:\\Users')).toBe(true)
+    expect(pattern.partialMatch('C:\\Users\\test')).toBe(true)
+  })
+
+  it('matches globstar patterns with backslashes on Windows', () => {
+    if (!IS_WINDOWS) {
+      return
+    }
+
+    const pattern = new Pattern('C:\\foo\\**')
+
+    // Should match the directory itself and descendants
+    expect(pattern.match('C:\\foo')).toBe(MatchKind.All)
+    expect(pattern.match('C:\\foo\\bar')).toBe(MatchKind.All)
+    expect(pattern.match('C:\\foo\\bar\\baz.txt')).toBe(MatchKind.All)
+  })
+
+  it('matches wildcard patterns with mixed separators on Windows', () => {
+    if (!IS_WINDOWS) {
+      return
+    }
+
+    // Pattern might be specified with forward slashes by user
+    const pattern = new Pattern('C:/Users/*/file.txt')
+
+    // But the actual path from filesystem will have backslashes
+    expect(pattern.match('C:\\Users\\test\\file.txt')).toBe(MatchKind.All)
+  })
+
+  it('handles complex patterns with backslashes on Windows', () => {
+    if (!IS_WINDOWS) {
+      return
+    }
+
+    const currentDrive = process.cwd().substring(0, 2)
+    const pattern = new Pattern(`${currentDrive}\\**\\*.txt`)
+
+    // Should match .txt files at any depth
+    expect(pattern.match(`${currentDrive}\\file.txt`)).toBe(MatchKind.All)
+    expect(pattern.match(`${currentDrive}\\foo\\bar\\test.txt`)).toBe(
+      MatchKind.All
+    )
+    expect(pattern.match(`${currentDrive}\\foo\\bar\\test.js`)).toBe(
+      MatchKind.None
+    )
+  })
+})

packages/glob/src/internal-pattern.ts

@@ -156,6 +156,10 @@ export class Pattern {
       itemPath = pathHelper.safeTrimTrailingSeparator(itemPath)
     }
 
+    // Convert to forward slashes on Windows before matching with minimatch
+    // since the pattern was converted to forward slashes in the constructor
+    itemPath = Pattern.convertToMinimatchPath(itemPath)
+
     // Match
     if (this.minimatch.match(itemPath)) {
       return this.trailingSeparator ? MatchKind.Directory : MatchKind.All
@@ -176,8 +180,11 @@ export class Pattern {
       return this.rootRegExp.test(itemPath)
     }
 
+    // Convert to forward slashes on Windows to match the pattern format used by minimatch
+    itemPath = Pattern.convertToMinimatchPath(itemPath)
+
     return this.minimatch.matchOne(
-      itemPath.split(IS_WINDOWS ? /\\+/ : /\/+/),
+      itemPath.split(/\/+/),
       this.minimatch.set[0],
       true
     )
@@ -193,6 +200,18 @@ export class Pattern {
       .replace(/\*/g, '[*]') // escape '*'
   }
 
+  /**
+   * Converts path to forward slashes on Windows for compatibility with minimatch.
+   * On Windows, minimatch patterns use forward slashes, so paths must be converted
+   * to match the same format.
+   */
+  private static convertToMinimatchPath(itemPath: string): string {
+    if (IS_WINDOWS) {
+      return itemPath.replace(/\\/g, '/')
+    }
+    return itemPath
+  }
+
   /**
    * Normalizes slashes and ensures absolute root
    */