Fix glob pattern matching on Windows by normalizing path separators

[Copilot]

Fix glob not working on Windows

Root Cause Analysis

The issue is in packages/glob/src/internal-pattern.ts in the match() and partialMatch() methods:

• Line 133: Pattern is converted to forward slashes (/) for minimatch on Windows
• Lines 144/156: Item paths are normalized to backslashes (\) on Windows
• Line 160: minimatch tries to match paths with backslashes against patterns with forward slashes, causing match failures

Implementation Plan

• [x] Analyze the exact issue and create minimal fix
• [x] Convert itemPath to forward slashes on Windows before passing to minimatch.match()
• [x] Ensure partialMatch() method has the same fix applied
• [x] Build and test the changes
• [x] Run existing test suite to ensure no regressions (all 74 tests passed)
• [x] Create a focused test case to validate the fix (5 new tests added, all passing)
• [x] Run security checks (CodeQL: 0 alerts)
• [x] Address code review feedback
• [x] Refactor duplicated code into helper method
• [x] Remove unused imports
• [x] Apply linting fixes
• [x] Final verification

Security Summary

CodeQL analysis completed with 0 alerts - no security vulnerabilities found.

Changes Made

1. packages/glob/src/internal-pattern.ts:
   • Added private static helper method convertToMinimatchPath() to eliminate code duplication
   • Convert itemPath to forward slashes on Windows before passing to minimatch.match()
   • Convert itemPath to forward slashes on Windows in partialMatch() method
2. .gitignore: Added .nx/ directory to exclude build cache
3. packages/glob/tests/windows-path-matching.test.ts: Added 5 comprehensive Windows-specific tests, removed unused import, applied eslint formatting fixes

Original prompt

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This section details on the original issue you should resolve

<issue_title>glob doesn't work on windows</issue_title> <issue_description>Describe the bug When using the @actions/glob library, it doesn't give any results when running on github's own windows runners.

To Reproduce Steps to reproduce the behavior: I created a minimal typescript action that reproduces this issue on windows runners: https://github.com/Jimver/glob-test/actions/runs/15453189713/job/43499917075

Expected behavior Regardless of OS, I would expect glob to return the test file we just created.

Notes Strangely, the globber does actually work in unit tests I wrote, see https://github.com/Jimver/glob-test/blob/main/tests/glob.test.ts. Though this is probably why this wasn't caught in the existing unit tests (if they run on windows). So basically the issue only manifests when running the actual action. I tried reproducing locally as well on my windows desktop but it works fine there as well. When just using readdir directly I see the file just fine on the windows runner (see the action log debug output), so it seems to be a combination of glob and something about the windows runners which is going wrong. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes actions/toolkit#2085

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