[wangxpych]

PR Checklist

• Addresses an existing open issue: fixes unloadFiles throws MODULE_NOT_FOUND in ESM context for files added with relative path #4548
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

addFile() keeps paths exactly as supplied, and Mocha loads relative paths from the current working directory. unloadFile() instead passed those paths directly to require.resolve(), which resolved them relative to lib/nodejs/file-unloader.cjs and threw MODULE_NOT_FOUND.

Resolve the file path from the current working directory before looking up its cache key. The regression test loads a fixture, adds it using a cwd-relative path, and verifies that unloadFiles() removes it from require.cache.

The commit includes co-author attribution for the original implementation in #4549.

Validation

• npm run test-node:unit — 1220 passing, 3 pending
• integration suite — 374 passing, 1 pending
• remaining Node interface, JS API, only, reporter, and require suites — passing
• Playwright browser suite — 4 passing
• Webpack compatibility build — passing
• formatting, ESLint, Knip, TypeScript, and smoke checks — passing

Fixes #4548

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: wangxpych / name: xuping.wang (45ea4ca)

[wangxpych]

Closing because I’m stepping back from maintaining this contribution. Thanks for your time.