# Vitest v0.0.137 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v0.0.137
- **Released:** Jan 07, 2022
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v0.0.137/

## Executive Summary (TL;DR)
Vitest v0.0.137. Source highlight: `mockClear` clears `instances` (#471) (eb107f3)

## Improvements
- cache externalization on main thread (79af776)

## Bug Fixes
- `mockClear` clears `instances` (#471) (eb107f3)
- guess cjs file by name containng module.js (ab8d7d3), closes #367
- jsdom supports Image (0c3f8e2), closes #419
- support mocking virtual modules (c927e2e), closes #464