# Vitest v4.0.18 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v4.0.18
- **Released:** Jan 22, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v4.0.18/

## Executive Summary (TL;DR)
Vitest v4.0.18. Source highlight:    🚀 Experimental Features

## New Features
- **experimental**: Add `onModuleRunner` hook to `worker.init` &nbsp;-&nbsp; by @sheremet-va in https://github.com/vitest-dev/vitest/issues/9286 <samp>(ea837)</samp>

## Bug Fixes
- Use `meta.url` in `createRequire` &nbsp;-&nbsp; by @sheremet-va in https://github.com/vitest-dev/vitest/issues/9441 <samp>(e0572)</samp>
- **browser**: Hide injected data-testid attributes &nbsp;-&nbsp; by @sheremet-va in https://github.com/vitest-dev/vitest/issues/9503 <samp>(f8989)</samp>
- **ui**: Process artifact attachments when generating HTML reporter &nbsp;-&nbsp; by @macarie in https://github.com/vitest-dev/vitest/issues/9472 <samp>(22543)</samp>