# What changed in vitest

> 536 changes in vitest 4 to 5 from its official release notes, upgrade guides and advisories: 67 breaking, 10 deprecations, 4 security, 119 new APIs and options. Each one cited. Sources checked 2026-10-17. HTML: https://unstale.sh/npm/vitest/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## vitest 5

### Breaking changes

- Browser instances now run as workers, changing resource usage and maxWorkers behavior. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Runs now fail when git or location filters report errors. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Reset operations now affect only spies that were called or reconfigured. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- vitest list now exits with status 1 when collection fails. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Tests fail when asynchronous assertions are not awaited. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The default attachments directory changes to .vitest/attachments/. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- attachmentsDir is now restricted to root configuration. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The public benchmark API is rewritten. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The client cdp API is disabled when allowWrite or allowExec is false. (3.2.5, 4.1.8, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.8), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v3.2.5)
- Mocks are cleared before each test by default. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Vitest no longer searches ancestor directories for a configuration file. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Coverage reports and all UI subtree requests now require authentication. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- coverage.exclude no longer inherits negation globs from test.include. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Concurrent runs now fail fast when reportsDirectory conflicts. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Deprecated package entry points are no longer available. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- expect.poll now fails when its function does not resolve within the allowed time. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Filter-only options are no longer allowed in getBy* locators. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Hoistable methods must be inside the top-level scope or an error is thrown. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The HTML reporter default output changes to .vitest. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Coverage include and exclude globs no longer match too eagerly. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- JSON and JUnit reporter output files are written to .vitest by default. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Locators are represented as objects instead of strings. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Browser locator exact matching is enabled by default. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Vitest now requires Node.js 22 and Vite 6.4. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The sequential test and suite options are removed in favor of concurrent. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The orchestrator HTML request now requires sessionId. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The broken ./src/* package export has been removed. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The -t test-name separator changes to >. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Vitest now exits non-zero when teardown throws during close. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Snapshot assertions used with test.fails now fail the test. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- String values in title $ variables no longer include quotes. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- toHaveTextContent becomes strict; toMatchTextContent provides the alternative matcher. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Using the same snapshot file for toMatchFileSnapshot and toMatchSnapshot is now rejected. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- @vitest/runner is inlined and is no longer published. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The webdriverio package is removed. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

### Security

- Snapshot files are evaluated on the server to support no-unsafe-eval CSP. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

### Deprecations

- Vitest warns when the deprecated deps.optimizer.web configuration is used. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- The sequential test API and options are deprecated. (4.1.6, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.6)

### New APIs and options

- The import.meta.hot stub now includes data. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Adds an option to cache dependencies instead of statically parsing them. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Adds an experimental option for configuring the UI theme. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- The UI adds a focused trace view layout mode. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Benchmarks support pluggable providers. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The changed option is now allowed in configuration options. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- TestModule diagnostics expose concurrencyId and workerId, with IDs becoming 1-based. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Default reporters are exposed through configDefaults.reporters. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- context.mark enables custom command tracing. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- createReport is added, along with the .vitest report directory convention. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- fsModuleCache is promoted to a top-level option. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The GitHub Actions summary title can be customized. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Headless Chrome sessions can use GPU acceleration. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The HTML reporter supports single-file output. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- A toggleable injectCjsGlobals option is available. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- logger.formatError is added for formatting errors. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Custom environments can opt out of module graph prewarming. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Projects can now be nested. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- -p becomes shorthand for --project. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- page.mark supports a custom kind. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Spy types now support private methods. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The CLI gains a --repeats option. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- browser.expect.toMatchScreenshot accepts screenshotDirectory. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Temporal can be mocked, including without enabling fake timers. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- thresholds.autoUpdate receives the previous threshold as an argument. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- ToMatchScreenshotResolvePath receives a project reference. (4.1.6, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.6)
- Fake timers now support the toNotFake option. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- TypeScript build mode is supported. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- vi.when() is added. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

### Performance

- Using --changed on a large graph now uses less peak memory. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- V8 coverage report generation is faster through bounded-memory merging and precompiled globs. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

### Behavior and default changes

- Cancelling a test run now aborts all running tests. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- The changed-test run reports how many tests were affected and the total count. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Changed-test detection now tracks project files and mocks. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- fsModuleCache is enabled by default. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- pretty-format now supports boxed symbols. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- toHaveTextContent can now be used without arguments. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- The trace attempts selector moved to the viewer header. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- The blob reporter and --merge-reports default to .vitest/blob/. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Browser sessions open adaptively instead of allocating maxWorkers upfront. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- clearCache is promoted out of experimental status. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Browser connectTimeout is now resolved from project configuration. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Duration breakdowns are reported as percentages. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- FORCE_COLOR now takes precedence over agent detection. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Framework assets are now served as immutable resources. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Framework sourcemaps are no longer served during headless runs. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The GitHub Actions reporter summary header now displays test.name. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Editor panel inline errors now render ANSI color codes. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Inline projects extend the root configuration by default. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The maxWorkers setting is now propagated to projects. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Merge reports is supported for non-sharded multi-environment runs. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The Node compile cache is opt-in, and worker caches persist during teardown. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- parseSpecifications is promoted out of experimental status. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Expects and matchers provide better promise support. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- vm pools support require(esm). (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Static reports no longer display the running count. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- A top-level test with concurrent false now overrides global sequence.concurrent true. (4.1.6, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.6)
- An empty string is now treated as a valid snapshot. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The summary reporter now intercepts logger streams even when they are not process standard streams. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Tasks now inherit suite options. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Logs recorded during a test are exposed. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- test.describe is now treated as a suite during static collection. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- thresholds.perFile accepts an object. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- toBeOneOf now accepts readonly arrays and sets. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Trace step-iframe split pane sizes are now persisted. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- vi.mock() is now hoisted for vite-plus/test imports. (4.1.9, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.9)
- thenResolve now accepts an awaited value. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- vitest list parses files statically by default. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- happy-dom and jsdom window objects can be mutated. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

### Tooling

- Mocks from finished test files are released. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Cache directories are tagged with CACHEDIR.TAG so tools can recognize them. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Browser failure screenshots are saved in attachmentsDir. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Suite interaction and layout in the explorer tree were improved. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- loupe.inspect is replaced with pretty-format. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The UI now provides a report view at suite level. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Coverage switches to @vitest/istanbuljs packages. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

### Fixes and other changes

- Late connections from closed browser sessions are dropped. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Vitest waits 30 seconds for the browser to close. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Browser plugins' buildStart hooks run when the server is created. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- The changed-file filter now handles quoted file names correctly. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Reporter output uses the end reason 'failed' when a worker crashes. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Vite's default fs.deny setting is preserved when an API token file is present. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Global setup runs once when browser instances are used. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Hook cleanup functions now run when a later hook fails. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- Synthetic pagehide events are ignored in browser tests. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- skipIf sets skip and ignores undefined options. (5.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.5)
- allowExternal now includes uncovered files correctly in coverage. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Browser API options are applied even when no browser configuration is provided. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Browser command arguments preserve undefined values. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Coverage no longer incorrectly marks filenames containing brackets as uncovered. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Module mocks are wrapped correctly during in-source testing. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- JUnit output strips ANSI sequences from all XML attributes. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Deep equality for Map and Set is corrected in some assertions. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- vm execution now binds this to module.exports. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Edge cases in native loader mocking are fixed. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Node builtins are resolved correctly in client environments. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Project configurations now respect the configured root. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Setup mocks are awaited before the test file is imported. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Snapshot handling now accounts for line endings. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- A zero truncation setting now preserves full dollar-prefixed string values. (5.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.4)
- Blob is supported when using jsdom 30.1. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Configuration for environments consumed by the browser is preserved. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- The browser server waits to listen until tests start running. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Cache key generators are scoped to individual projects. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Imports of cached modules are revalidated. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- expect.extend asymmetric matchers now receive the current equality testers. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Dependencies referenced from index.html are no longer optimized in VM mode. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Browser mode no longer prints an interceptor warning. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Browser mock path matching now checks path boundaries. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Page crashes during cancellation are ignored. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Unique pool IDs are preserved when groupOrder is set. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Each repeats run now isolates result.status from other runs. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- The split-pane handle no longer overlaps the iframe in the UI. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Expected failures marked with test.fails are no longer retried. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- Retried screenshot tests now use the correct reference image. (5.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.3)
- The agent reporter now respects the --silent command-line option. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- The UI authentication cookie now persists beyond the current browser session. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- Concurrent createReport calls are now handled correctly by reporters. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- Async leak detection now ignores process.stdio handles. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- Vitest now binds process correctly when the global process value has been overwritten. (4.0.7, 5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- Request now handles Blob bodies correctly when using jsdom 28 or newer. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- Spying on Set.prototype.add no longer causes a stack overflow. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- toMatchObject now works correctly with asymmetric matchers. (5.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.2)
- Automocking avoids creating recursive prototypes. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Clearing the cache now preserves the metadata file. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Browser mode avoids inserting double quotes in config.define values. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- The doctor command now measures VM pools for custom environments. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- deepMerge now handles prototypes correctly. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- The UI now shows the correct explorer file summary count. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- toNotFake now forces queueMicrotask and nextTick behavior. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- UI suite collapse and expansion now works with file name search. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Obsolete snapshot keys are reported next to skipped tests. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Public type declarations are now self-contained. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- ResolvedConfig no longer produces exactOptionalPropertyTypes errors. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Configurations using self-referencing extends now share the server. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Static collection preserves parse error details for better failure diagnosis. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- toMatchAriaSnapshot now returns the correct value. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Vitest prevents false import resolution results. (5.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.1)
- Class mock prototype methods are preserved on instances. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- CTRL+c now exits even when globalSetup runs blocked code. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- describe.for now propagates chainable flags. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Browser mode now respects disableConsoleIntercept. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Queued mocks from doMock() are now applied in queue order. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Non-Error causes from environment setup now render instead of dropping the actual diagnostic. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The explorer virtual scroller is revealed correctly after resizing. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- External module resolution now handles encoded URIs with the deps optimizer query. (4.1.3, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.10), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- for/each title placeholders support non-ASCII characters. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Directory globs in forceRerunTriggers are now applied against files. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The global concurrency limit now applies to test lifecycle operations. (4.1.11, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.11)
- importOriginal now works with the optimizer and query imports. (4.1.9, 5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.9)
- Non-serializable functions are stripped from inline diff configuration. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- JUnit XML reports now include unhandled errors. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Vitest no longer crashes when processing a malformed inline source map. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Vitest falls back to compiling from source when a module's code cache is rejected. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Mixed stdout and stderr logs now receive correct timestamps. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Vitest no longer duplicates oxc.target when a custom array is provided. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Per-project sequence configuration is now handled correctly. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Test tags options now overwrite inherited suite options. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- toHaveProperty now handles nullish values correctly. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- The command no longer reports false success when the tsc process crashes. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Watch-run UI state now stays synchronized when files are removed. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)
- Worker startup failures now fail gracefully, and Node 26 localStorage warnings are suppressed. (5.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0)

## vitest 4

### Breaking changes

- Redirect mocks are restricted to paths permitted by the filesystem allowlist. (4.1.11) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.11), [security advisory](https://github.com/advisories/GHSA-82FW-GWWQ-J7X9)
- Removes JestExtendError.context from verbose error reporting. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- setupFiles is no longer resolved from a parent directory. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- Removes support for the Vite 8 beta, affecting projects relying on that prerelease. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Calling a suite function inside a test is now rejected. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- collect is renamed to import and is no longer the supported name. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- import replaces collect as the supported name. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- prepare is removed. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- getBuiltins no longer returns Node builtins unconditionally. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)
- The ast export was removed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The basic reporter was removed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- In-source tests run only when the containing file is itself a test file. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Deprecated coverage options were removed in favor of vitest/node exports. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- coverage.exclude now keeps only string values. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Setting the test environment to browser is forbidden. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The deprecated environmentMatchGlobs option was removed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- ErrorWithDiff was removed in favor of TestError. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Vitest now uses ES2022 language features, which may affect runtime compatibility for projects running Vitest. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The deprecated getSourceMap API was removed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- minWorkers was removed and is automatically set to 0 outside watch mode. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The engines field no longer supports Node 18. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Node types were removed from the main entry point; import them from vitest/node instead. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Tests fail on CI when snapshots are obsolete. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The deprecated order parameter was removed from the test API. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The deprecated poolMatchGlobs option was removed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Project configuration files are limited to names containing vitest.config or vite.config. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Browser mode now requires a provider factory instead of a provider string. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Calling useFakeTimers multiple times now overrides the existing fake timers. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- UserConfig was removed; ViteUserConfig should be used instead. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Vitest no longer supports Vite 5. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Vitest uses module-runner instead of vite-node. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The deprecated workspace option was removed in favor of projects. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)

### Security

- Browser builtin commands now check filesystem access. (3.2.7, 4.1.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.10), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v3.2.7)
- Updates flatted and removes version pinning to resolve CVE-related issues. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- When Vitest UI server is listening, arbitrary file can be read and executed (3.2.6, 4.1.0) — [security advisory](https://github.com/advisories/GHSA-5XRQ-8626-4RWP)

### Deprecations

- Vitest now shows a warning when browser.isolate is used. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- toBe* spy assertions are deprecated in favor of toHaveBeen* and toThrowError. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- toHaveBeen* is the preferred replacement for deprecated toBe* spy assertions. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Vitest warns when vi.hoisted is declared outside the module top level. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Vitest warns when vi.mock is declared outside the module top level. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Several vitest/* entry points are now deprecated. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Vitest logs a deprecation warning when test.poolOptions is configured. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- The browser-specific isolate option is deprecated in favor of the inherited isolate option. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)

### New APIs and options

- Istanbul coverage now supports the instrumenter option. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Experimental support for aria snapshots is added. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- The JSON reporter gains a filterMeta option. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- Adds an exact matching option for browser locators. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Adds support for custom snapshot matchers. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Exports the custom snapshot matcher helper from vitest. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Adds an experimental preParse configuration flag. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Adds bodyEncoding to TestAttachment. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Introduces the experimental.vcsProvider configuration option. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Exposes matchesTags to test whether the current filter matches tags. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Allows opening the browser in standalone mode without running tests. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Provides vi.advanceTimers to the preview provider. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- A new agent reporter reduces AI agent token usage. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Adds the allowExec option to api. (3.2.5, 4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v3.2.5), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Adds the allowWrite option to api. (3.2.5, 4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v3.2.5), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- aroundAll hooks are now available for wrapping all tests in a suite. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- aroundEach hooks are now available for wrapping each test. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- An assertion helper can hide internal stack traces from assertion output. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Chai-style assertions are now available in Vitest tests. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Coverage reports can now include only changed files. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- createSpecification now accepts filters. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The UI now supports configuring details panel position and provides a button for it. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- A CLI option detects asynchronous resource leaks. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- webdriverio and preview now expose findElement and enable strict mode. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Coverage now supports ignore start/stop hints in source code. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Import duration reporting now supports print and fail thresholds. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Import duration reporting now supports a limit option. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Import duration reporting now supports a print option. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Playwright launchOptions can now be used together with connectOptions. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Matcher types are now publicly exposed for type-aware integrations. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Test options now support attaching meta information. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Mocks can now be configured to throw errors. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Mocks can now be configured to throw errors once. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- An option now allows disabling the module runner. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The page/locator.mark API adds annotations to improve Playwright traces. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Playwright browser mode now supports persistent contexts. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- prettyDOM now supports filtering nodes from browser assertion error output. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The UI now supports filtering and sorting projects. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Retry options have been enhanced. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The API now exposes runTestFiles as an alternative to runTestSpecifications. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Timer controls now expose setTickMode through the updated fake-timers integration. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Tests can now use tags for categorization and filtering. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- A new test.extend syntax provides improved type inference. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Reported tasks now include toTestSpecification. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- toTestSpecification can now receive test cases. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The --update flag now accepts new or all to control snapshot updates. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Snapshot configuration now supports update: "none". (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Browser user-event interactions now include wheel events. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- vi.mocked now supports deep partial typing. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- worker.init now supports an onModuleRunner hook. (4.0.18) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0), [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.18)
- TRACEPARENT is supported for OpenTelemetry context propagation. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- TRACESTATE is supported for OpenTelemetry context propagation. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Custom pools can use the exported setupEnvironment API. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Plugins can opt out of caching, and the internal root cache is fixed. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- Exposes utils.configurePrettyDOM for configuring pretty DOM output in browser mode. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- Adds an experimental file system cache to improve Vitest performance. (4.0.11) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.11)
- Provides the current task in MatchState for matcher implementations and integrations. (4.0.11) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.11)
- Adds experimental support for OpenTelemetry traces. (4.0.11) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.11)
- Adds an extensible API for working with test artifacts. (4.0.11) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.11)
- The selectOptions element parameter now accepts the Locator type in browser tests. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)
- The jsdom environment now supports the AbortSignal API. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The mocker package adds an automocker entry. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- An export for browser/utils was added. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- BrowserProviderOption now exposes an options field. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- CDP Session is re-exported directly from Playwright. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The vitest list command now supports the --changed flag. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Spying on classes is now supported. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Custom screenshot comparison algorithms are supported. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The disableCoverage method was added. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The enableCoverage method was added. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- expect.assert now supports type narrowing. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Custom expect messages are supported for expect.extend matchers. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The module-runner package now supports getBuiltins. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The getGlobalTestNamePattern method was added. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The getSeed method was added. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- github-options adds displayAnnotations. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The Playwright provider now supports iframe locators. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- webdriverio now supports the --inspect option. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Locators now expose length, and toHaveLength accepts locators. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- An onUnhandledError callback is available for handling unhandled errors. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- TestModule now exposes relativeModuleId. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Matchers for schema validation were added. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Hooks now support type-safe extra context through TestAPI. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Browser mode adds toBeInViewport for checking whether an element is in the viewport. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The toBeNullable expect function checks whether a value is nullish. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Browser mode adds toMatchScreenshot for visual regression testing. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Browser mode adds the trackUnhandledErrors option. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The verbose reporter now prints tests in a list; tree was introduced as a separate reporter. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- vi.mockObject now accepts a spy option. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The Vitest watcher is now exposed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)

### Performance

- jsdom reuses abort signals when possible. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- When enabled, the filesystem module cache reads from memory whenever possible. (4.0.13) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.13)
- Cached modules avoid an unnecessary fetchModule roundtrip. (4.0.13) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.13)
- Test files are now sorted by project by default, improving pool execution performance. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- expect improves performance by optimizing input type checks. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)
- With --no-isolate and --maxWorkers=1, test files are passed at once for improved performance. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)

### Behavior and default changes

- The agent reporter name is now an alias for the minimal reporter. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Web workers now support MessagePort objects referenced inside postMessage data. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- The default snapshot maximum output length has increased. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Test-specification options are now writable. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- The experimental assertion field is exposed publicly. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- User server options are spread into the browser Vite server in the project. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- The text reporter defaults to skipFull when an agent is detected. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- Colors are disabled when an agent is detected. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- Limits output for large objects. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- beforeAll and afterAll fixtures now receive file context. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Async assertions can now be followed by catch and finally handlers. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- beforeAll and afterAll fixtures now receive file context. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Cancelling a run now stops the current test immediately. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- doMock() can now return a disposable for controlling mock lifetime. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Snapshot assertions now work with expect.soft. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Specification parsing now supports tests whose names start or end with test. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- External modules now respect project resolve.conditions. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Vitest now logs the seed when only sequence.shuffle.tests is enabled. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The default SSR environment runner is now the Vitest server module runner. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- webdriverio and preview now enable strict mode. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- vitest list can statically collect tests without running files to collect them. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Watch mode now uses an agent check instead of only checking TTY. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Injected data-testid attributes are hidden in browser mode. (4.0.18) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.18)
- Asymmetric matcher diffs are more readable because container matchers are unwrapped. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- UUID generation no longer relies on crypto.randomUUID, allowing operation in insecure environments. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- WebdriverIO falls back to WebDriver Classic when needed. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Forceful CTRL+c exits terminate workers. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- The GitHub reporter includes the project in its output. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- Tasks now include full names, making task identity clearer in runner output and integrations. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- postMessage can send ports to web workers. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- Functions are now accepted as standard schemas. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- fsModuleCachePath is inherited by default. (4.0.12) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.12)
- The browser mode UI now includes favicon icons. (4.0.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.9)
- toBeOneOf now supports Set values in expect assertions. (4.0.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.9)
- The --config option now allows a module as its configuration input. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)
- coverage autoUpdate now supports percentage formatting. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- When specified, config.browser.instances[].include overrides config.include. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Coverage now includes files selected by the --project filter. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The default exclude pattern was simplified. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- defineConfig can now return a promise. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- experimental_parseSpecifications is now exposed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- locator.element() now returns HTMLElement or SVGElement. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The spying implementation was rewritten to make module mocking more intuitive. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Synchronous not.toBeInTheDocument() is now supported. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The onConsoleLog callback now receives the logged entity. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Test files are distributed more evenly across shards. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- test or describe calls without a function are assigned todo mode. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- test.extend now uses the suite's timeout. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- trackUnhandledErrors is disabled when the inspector is enabled. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)

### Tooling

- Static test discovery now recognizes the __vi_import_ prefix. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Adds @vitest/coverage-istanbul as an optional dependency. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Adds @vitest/coverage-v8 as an optional dependency. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- CLI tab completions are now available through @bomb.sh/tab. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The UI explorer can now sort tests by duration. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Expectedly failed tests are tracked and displayed in the UI and CLI. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The GitHub Actions Reporter now includes a run summary. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The UI can now run an individual test or suite. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- The UI can now filter for slow tests. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Failure screenshots are now stored using the artifacts API. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Browser mode supports OpenTelemetry, enabling telemetry instrumentation during browser tests. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Reporters print a breakdown of import durations. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- The UI adds a tabbed screenshot-failure view with a comparison slider. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- Playwright tracing is now supported. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The vitest init command now supports qwik. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)

### Fixes and other changes

- Manual and redirect mocks were hardened, improving mock behavior for developers using Vitest's mocker. (4.1.12) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.12)
- Browser sessions now wait for orchestrator readiness before resolving. (4.1.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.9)
- Browser preparation now waits for iframe tester readiness. (4.1.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.9)
- Test runs no longer hang when a worker crashes. (4.1.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.9)
- Orphaned Playwright routes are removed when the same module is mocked through multiple ids. (4.1.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.8)
- Concurrency is now limited per task branch as well as per leaf callbacks. (4.1.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.7)
- The HTML reporter now displays project color labels correctly. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Project negation now excludes browser instances. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Coverage reports now provide a descriptive error when the reports directory is removed during a test run. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- Soft assertions now respect diff configuration options. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- vi.defineHelper now works when called as an object method. (4.1.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.5)
- The message passed to expect is consistently used as the error message prefix. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- Imports matching class property names are no longer hoisted. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- Labeled terminal messages use a black foreground to improve contrast. (4.1.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.4)
- Fake timers now advance with the expect.poll interval. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Prevents runner types from leaking into expect types. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Fixes obsolete snapshot warnings for snapshot properties mismatches. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Fixes suite hooks throwing errors for unused auto test-scoped fixtures. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Prevents Vite types from leaking into the UI surface. (4.1.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.3)
- Corrects coverageConfigDefaults values and types. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- Mock and unmock resolution is now sequential. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- Fixes output-limit overcounting in pretty-format output. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- Browser tests take a failure screenshot when a stable screenshot cannot be captured. (4.1.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.2)
- Preserves the coverage report when the HTML reporter overlaps. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Detects fixtures that return without calling use, preventing incomplete fixture execution from going unnoticed. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Properly re-evaluates actual modules of mocked external modules. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Fixes RegExp serialization for retry.condition. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Fixes the sinon-chai style assertion API. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Soft assertions continue after promise errors from .resolves or .rejects. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Stops treating extra properties on a test return value as tests. (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- Fixes a type regression affecting static class methods passed through vi.mocked(). (4.1.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.1)
- bench.reporters no longer reports type errors when given file-name string paths. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Browser mode now handles screenshot artifacts and avoids duplicate failure screenshots. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- external and noExternal are now handled during the configEnvironment hook. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- userEvent actions now support ensureAwaited. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- hideSkippedTests no longer hides test.todo. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Hooks now respect maxConcurrency. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Inline snapshots now work inside test.for/each. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Passing toMatchScreenshot tests no longer updates screenshots. (4.1.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.1.0)
- Artifact attachments are processed when generating the HTML reporter. (4.0.18) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.18)
- createRequire now uses meta.url. (4.0.18) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.18)
- addEventHandler now handles null options without failing. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- File uploads now preserve the correct File instance in browser mode. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- fileParallelism now works when configured on a browser-mode instance. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- The HTML reporter detects gzip using magic numbers instead of the Content-Type header. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- import.meta.env defines are fixed for inline browser projects. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Mock transformation now works correctly with classes. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- process.env defines are fixed for inline browser projects. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Runner errors are improved when code imports outside of test context. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Reports now identify the test module when it fails to run. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Nested test.only selections are respected inside describe.only blocks. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Typecheck reports provide a better error message when tsc outputs help text. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Environment options are validated when a worker is reused. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Worker start failures are handled gracefully. (4.0.17) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17)
- Console log string formatting works correctly when placeholders are included. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Fully dynamic imports can now be inlined. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- The module graph UI works correctly with headless browser mode. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- The browser mode import.meta.env definition is fixed. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Vitest no longer crashes when process.versions is stubbed. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Browser integrations can import recordArtifact from the vitest package. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Source maps for untested Istanbul files are corrected. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Browser mode testTimeout defaults back to 15 seconds. (4.0.16) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.16)
- Extended matchers preserve currentTestName. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- External dependency behavior is corrected when using the dependency optimizer. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- The Istanbul coverage provider no longer breaks source maps. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- Uses optimizeDeps.rolldownOptions to address a deprecated warning and fix ssr.external: true. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- Overridden methods are not mocked when the parent was automocked. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- Runs toMatchScreenshot only once when used with expect.element. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- MessagePort objects work with Worker.postMessage when clone is set to native. (4.0.15) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.15)
- Circular modules are invalidated correctly when rerunning with coverage enabled. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- Non-UI browser mode no longer applies the reverted viewport scaling behavior. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- VITEST_POOL_ID is initialized before environment setup. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- VITEST_WORKER_ID is initialized before environment setup. (4.0.14) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.14)
- Vitest types no longer depend on types from Vite 7.1. (4.0.13) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.13)
- The browser entry no longer imports Node.js-dependent types. (4.0.13) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.13)
- Public types no longer import from @opentelemetry/api. (4.0.12) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.12)
- Stack traces are parsed correctly for the Bun runtime. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- The UI uses execution time from the WebSocket reporter when the run finishes. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- Browser dependency stack traces are handled correctly when external source maps are used. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- The browser UI no longer scales the iframe when the UI is disabled. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- The onCancel callback is removed when a worker is terminated. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- Vitest no longer starts a new run while cancellation is in progress. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- Reporters now report the correct test run duration when the run ends. (4.0.10) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.10)
- The UI now reports file, suite, and test durations correctly. (4.0.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.9)
- A cloned request in jsdom is now an actual Request instance. (4.0.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.9)
- Fork workers receive more time to start, improving reliability when launching worker processes. (4.0.9) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.9)
- Passes no argument to the Webdriver command when the .click interaction command receives no argument. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Restores the missed context.d.ts file. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Corrects the error message shown when expect.element() is not awaited. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Prevents forks from failing when Windows Defender is enabled. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Cleans up frame-ancestors from the CSP header in the coverage middleware. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Works around the noExternal merging bug on Vite 6. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Properly encodes Uint8Array bodies in annotations. (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Copies static properties when a spy is initialized with vi.fn(), and fixes types for vi.spyOn(obj, class). (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- Fixes types for vi.spyOn(obj, class). (4.0.8) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.8)
- The CLI now parses --execArgv as an array. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- With isolate disabled, Vitest creates one environment per worker instead of recreating it. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- Browser mode now inherits the general isolate option. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- Vitest avoids passing the --require argument when running in Deno. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- The matcher now accepts Locator values as possible element types. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- Typecheck reruns now work outside tsc. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- The jsdom environment now supports URL.createObjectURL. (4.0.7) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.7)
- Additional keys are properly torn down in happy-dom. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Errors with different diffs are no longer merged when reported. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Importing a type from an external package no longer throws. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- jsdom now passes Node.js FormData through to Request. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Browser mode now supports module tracking. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Browser setup files are re-evaluated on each test run. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Spying types are improved for more accurate type checking. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- The same environment is reused when isolate and fileParallelism are false. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Virtual files are no longer filtered out before remapping to sources during coverage processing. (4.0.6) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.6)
- Pool error messages now use groupOrder instead of groupId. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)
- Dependencies are externalized while respecting ssr.noExternal, fixing Svelte and Astro integrations. (4.0.5) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.5)
- Fixes an RPC listener leak when isolate is disabled. (4.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.4)
- Built-in modules can now be mocked without using the node: prefix. (4.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.4)
- The vi.mocked utility now accepts classes. (4.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.4)
- Publishes a missing context file required for WebdriverIO browser integration. (4.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.4)
- Worker standard input and output are captured by the logger. (4.0.4) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.4)
- The happy-dom environment supports fetch globals. (4.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.3)
- Browser in-source testing validation is more stable. (4.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.3)
- The init command uses the correct JSX or TSX extension. (4.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.3)
- Reporter options from config are preserved when CLI reporters override configured reporters. (4.0.3) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.3)
- The deprecation notice is no longer printed in node_modules. (4.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.2)
- Test environment variables are assigned before tests run so they stay synchronized with process.env. (4.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.2)
- Spies are reset correctly when both restoreMocks and mockReset are enabled in the configuration. (4.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.2)
- Spies now properly inherit the implementation's length property. (4.0.2) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.2)
- The communication channel is no longer torn down too soon when work is still running after a test. (4.0.1) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.1)
- BrowserCommand can be imported when no browser package is installed. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- When expect.poll assertions fail, the assertion error is shown first. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Filename filters no longer run duplicate tests in workspaces. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- import.meta.resolve now works on Vite 7. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- The standalone mode is ignored when a CLI filename filter is used. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)
- Test errors in Node.js context always have a stacks property. (4.0.0) — [release notes](https://github.com/vitest-dev/vitest/releases/tag/v4.0.0)