@vitest/spy

Features

• experimental: Tag cache directories with CACHEDIR.TAG

• experimental: Support test.ui.theme option

• experimental: Highlight selector multiple matches in trace view

• experimental: Print how many tests were affected and a total when running --changed

• experimental: Add an option to cache dependencies instead of statically parsing them

• experimental: Add fit and zoom controls to trace viewer

Bug Fixes

• Fail the run on git and location filter errors

• Enable fsModuleCache by default

• Track project files and mocks with --changed

• Refactor caching, fix : in project and change the shape of results cache

• Keep full $ string values when taskTitleValueFormatTruncate is 0

• Resolve node builtins in client environments

• Fix module graph builtin externals after #11421

• Wrap module mocks during in-source testing

• Handle line endings in snapshot

• Respect root in projects

• Resolve mocks in directories with spaces

• api: Publish the api token atomically

• browser: Close the mock route interception race

• browser: Allow toHaveTextContent without arguments

• browser: Apply API options without browser config

• browser: Preserve undefined command arguments

• browser: Wait for setup mocks before importing a test file

• browser: Avoid extra scroll outside the iframe

• browser: Run browser instances as workers

  • ⚠️ This can degrade performance if you have a custom maxWorkers setting. Previously, it was applied incorrectly and could lead to Vitest using too many resources. For example, a lower number would still open too many browsers. Fixing it means Vitest opens less instances by default now.

• browser: Open one cdp session per tester

• browser: Clean up unmocked and pending mocks

• coverage: V8 browser memory leak between test files

• coverage: allowExternal fails to include uncovered files

• coverage: Filenames containing brackets incorrectly showing as uncovered

• coverage: Istanbul coverage wrong when module transform warmups

• deps: Update all non-major dependencies

• expect: Fix Map and Set deep equality in some assertions

• expect: Check value in chai-style returned

• mocker: Fix native loader mocking edge cases

• pretty-format: Support boxed symbols

• reporters: Junit to strip ANSI sequences from all XML attributes

• runner: Don't cache failed fixture setups

• typecheck: Use typescript pool in toTestSpecification

• ui: Remove duplicate browser-open call opening two tabs

• ui: Simplify explorer filtering + fix nested tests when search matches a suite

• ui: Store module graph once per environment

• ui: Mount index.html handler on the ui base path

• ui: Center split pane resize handle

• vm: Bind this to module.exports

Performance

• Reuse fsModuleCache when filtering by source

• spy: Reset only mocks that were called or reconfigured