# Vitest v1.3.0 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v1.3.0
- **Released:** Feb 16, 2024
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v1.3.0/

## Executive Summary (TL;DR)
Vitest v1.3.0. Source highlight: Deprecate watchExclude - by @patak-dev in https://github.com/vitest-dev/vitest/issues/5171 <samp>(82885)</samp>

## New Features
- Deprecate watchExclude - by @patak-dev in https://github.com/vitest-dev/vitest/issues/5171 <samp>(82885)</samp>
- Run test files in isolated iframes - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/5036 <samp>(4f401)</samp>
- Add `snapshotSerializers` option - by @fenghan34 in https://github.com/vitest-dev/vitest/issues/5092 <samp>(5b102)</samp>
- Support custom options - by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/5111 <samp>(fec9c)</samp>
- Support automatic fixtures - by @fenghan34 and @sheremet-va in https://github.com/vitest-dev/vitest/issues/5102 <samp>(0441f)</samp>
- Save splitpanes size to local storage - by @posva in https://github.com/vitest-dev/vitest/issues/5166 <samp>(c28b4)</samp>

## Bug Fixes
- Fix sourcemap in vm pools - by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/5063 <samp>(81105)</samp>
- Don't optimize react/jsx-runtime by default when running in Node - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/5079 <samp>(0d2bf)</samp>
- Rpc timeout error messages to include caller - by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/5103 <samp>(a6e04)</samp>
- Requires fixed version across the monorepo - by @antfu in https://github.com/vitest-dev/vitest/issues/5208 <samp>(68f51)</samp>
- Prevent merging of `poolOptions` - by @penalosa in https://github.com/vitest-dev/vitest/issues/5221 <samp>(bc5b2)</samp>
- Don't exclude node builtins from optimization - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/5082 <samp>(714c9)</samp>