Vitest

fsModuleCache is now enabled by default, and the trace viewer gains fit and zoom controls plus highlighting of multiple selector matches. Fixed coverage memory leaks, V8 browser leak between test files, module mock resolution in directories with spaces, and Map/Set deep equality in assertions.

No significant changes

    View changes on GitHub

Fixed result.status leaking between repeats runs and mock path boundary checks in browser mode, where configs of browser-consumed environments are now kept and the server listen is delayed until tests start. Also revalidates imports of cached modules and scopes cache key generators to projects.

Fixes a crash occurring in the new VS Code version, prevents failures on unexpected coverage output, and corrects watcher scoping and setup timing.

Fixed toMatchObject handling of asymmetric matchers and a stack overflow when spying Set.prototype.add. Also fixes jsdom 28+ Request with Blob body, concurrent createReport calls, agent reporter --silent, and UI auth cookie persistence.

vitest list now exits with code 1 when collection fails, parse error details are preserved in static collection, and deepMerge no longer mishandles prototypes. Also adds a focused trace view layout mode and a trace attempts selector in the UI header, plus a warning when the deprecated deps.optimizer.web is used.

Adds a trace view for debugging and fixes compatibility with Vitest 5's testNamePattern. Also fixes an issue with the legacy AST collector ignoring computed member calls from esbuild's using helper.

Vitest 5 is officially out! This release focuses on performance and brings a lot of new features while fixing long-standing bugs. See our blog post for the official announcement.

   🚨 Breaking Changes

• Replace…

vitest list now parses files statically by default, replacing the previous behavior that relied on running the test files. Also promotes clearCache out of experimental, adds a link to open Playwright traces in the UI, and includes several bug fixes.

parseSpecifications is no longer experimental. Coverage now uses @vitest/istanbuljs packages, and UI features include source-location highlighting and keyboard navigation for trace steps. Several bug fixes roll in across browser, coverage, snapshot, and worker handling.

Revived the global concurrency limit for test lifecycle in a backport to v4. Also backported fixes that encode iframeId in tester iframe URLs, trigger playwright/chromium gc on low disk availability, and restrict redirect mocks to the fs allowlist.

Browser tests now fail instead of hanging when the browser stops responding, and the GitHub Actions reporter supports a custom summary title and displays test names. Multiple fixes across browser, pool, and UI, including requiring auth for coverage report requests and preserving the root during config resolution.

Tests now fail when an asynchronous assertion is not awaited, inline projects extend the root config by default, and nested projects are now supported. Also enables Temporal mocking without fake timers, uses > as separator in -t test filtering, shares the Vite server between inline projects, and preserves class mock prototype methods on instances.

Config resolution is now separated from server creation, a breaking change for programmatic usage. New features include a pluggable benchmark provider API, toggable injectCjsGlobals option, and performance improvements through warm modules, Node compile cache, and bundled dependencies.

Diagnostic entries are now tagged with source="Vitest" instead of the default, making them identifiable in the Problems panel and other tooling.