Storybook 8.5 is packed with powerful features to enhance your development workflow. This release makes it easier than ever to build accessible, well-tested UIs. Here’s what’s new:

🦾 Realtime accessibility tests to help build UIs for everybody
🛡️ Project code coverage to measure the completeness of your tests
🎯 Focused tests for faster test feedback
⚛️ React Native Web Vite framework (experimental) for testing mobile UI⚛️
🎁 Storybook test early access program to level up your testing game
💯 Hundreds more improvements

<details> <summary>List of all updates</summary>

Addon A11y: Add conditional rendering for a11y violation number in Testing Module - #30073, thanks @valentinpalkovic!
Addon A11y: Add typesVersions support for TypeScript definitions in a11y package - #30005, thanks @valentinpalkovic!
Addon A11y: Adjust default behaviour when using with experimental-addon-test - #30162, thanks @valentinpalkovic!
Addon A11y: Change default element selector - #30253, thanks @valentinpalkovic!
Addon A11y: Create a11y test provider and revamp a11y addon - #29643, thanks @valentinpalkovic!
Addon A11y: Don't set a11y tag as comment in automigrations - #30257, thanks @valentinpalkovic!
Addon A11y: Fix skipped status handling in Testing Module - #30077, thanks @valentinpalkovic!
Addon A11y: Refactor environment variable handling for Vitest integration - #30022, thanks @valentinpalkovic!
Addon A11y: Remove warnings API - #30049, thanks @kasperpeulen!
Addon A11y: Run the a11y automigration on postInstall - #30004, thanks @kasperpeulen!
Addon A11y: Show errors of axe properly - #30050, thanks @kasperpeulen!
Addon A11y: Update accessibility status handling in TestProviderRender - #30027, thanks @valentinpalkovic!
Addon Docs: Dynamically import rehype - #29544, thanks @valentinpalkovic!
Addon Docs: Make new code panel opt in - #30248, thanks @shilman!
Addon Onboarding: Prebundle react-confetti - #29996, thanks @yannbf!
Addon Test: Add @vitest/coverage-v8 during postinstall if no coverage reporter is installed - #29993, thanks @ghengeveld!
Addon Test: Add prerequisite check for MSW - #30193, thanks @yannbf!
Addon Test: Add support for previewHead - #29808, thanks @ndelangen!
Addon Test: Add Vitest 3 support - #30181, thanks @valentinpalkovic!
Addon Test: Always run Vitest in watch mode internally - #29749, thanks @JReinhold!
Addon Test: Always use installed version of vitest - #30134, thanks @kasperpeulen!
Addon Test: Clarify message when vitest detects missing deps - #29763, thanks @ndelangen!
Addon Test: Clear coverage data when starting or watching - #30072, thanks @ghengeveld!
Addon Test: Context menu UI - #29727, thanks @ghengeveld!
Addon Test: Context menu updates - #30107, thanks @ghengeveld!
Addon Test: Correctly stop Storybook when Vitest closes - #30012, thanks @JReinhold!
Addon Test: Filter out falsy test results in TestProviderRender - #30001, thanks @valentinpalkovic!
Addon Test: Fix documentation links - #30128, thanks @yannbf!
Addon Test: Fix duplicate test.include patterns - #30029, thanks @JReinhold!
Addon Test: Fix environment variable for Vitest Storybook integration - #30054, thanks @valentinpalkovic!
Addon Test: Fix error reporting for vitest crashes - #29751, thanks @ndelangen!
Addon Test: Fix generated path to vitest.setup.js - #30233, thanks @JReinhold!
Addon Test: Fix indexing behavior - #29836, thanks @yannbf!
Addon Test: Fix printing null% for coverage - #30061, thanks @ghengeveld!
Addon Test: Fix run request while booting or restarting Vitest - #29829, thanks @ghengeveld!
Addon Test: Handle undefined storyId - #29998, thanks @ghengeveld!
Addon Test: Improve error message on missing coverage package - #30088, thanks @JReinhold!
Addon Test: Improve support for mono-repos - #30216, thanks @valentinpalkovic!
Addon Test: Make component tests status row link to the story's tests panel - #29992, thanks @ghengeveld!
Addon Test: Merge viteFinal config into vitest config - #29806, thanks @ndelangen!
Addon Test: Only optimize react deps if applicable in vitest-plugin - #29617, thanks @yannbf!
Addon Test: Only reset story count on file change when watch mode is enabled - #30121, thanks @ghengeveld!
Addon Test: Optimize internal dependencies - #29595, thanks @yannbf!
Addon Test: Prompt switch to experimental-nextjs-vite - #29814, thanks @ndelangen!
Addon Test: Refactor test addon to include stories automatically - #29367, thanks @yannbf!
Addon Test: Remove a11y placeholder - #29769, thanks @JReinhold!
Addon Test: Replace glob with tinyglobby - #29817, thanks @ghengeveld!
Addon Test: Serve staticDirs with Vitest - #29811, thanks @ghengeveld!
Addon Test: Show sub test provider toggle state in main testing module - #30019, thanks @ghengeveld!
Addon Test: Support Storybook environment variables in Vitest - #29792, thanks @ghengeveld!
Addon Test: Use correct vitest config file path - #30135, thanks @kasperpeulen!
Addon Test: Use local storybook binary instead - #30021, thanks @kasperpeulen!
Addon Test: Use ProgressSpinner for stop button in Testing Module - #29997, thanks @ghengeveld!
Addon Test: Wait for 2 seconds before showing result mismatch warning - #30002, thanks @ghengeveld!
Addon Test: Wrap sub-paths exported with require.resolve - #30026, thanks @ndelangen!
Addon Themes: Deprecate useThemeParameters - #30111, thanks @yannbf!
Angular: Support statsJson in angular schemas - #29233, thanks @yannbf!
Automigration: Improve addon-a11y-addon-test - #30127, thanks @valentinpalkovic!
Automigration: Improve setup file transformation and version range handling for a11y migration - #30060, thanks @valentinpalkovic!
Automigrations: Skip vite config file migration for react native web - #30190, thanks @dannyhw!
Build: Downgrade to esbuild 0.24.0 - #30116, thanks @yannbf!
Build: Revert Downgrade to esbuild 0.24.0 - #30120, thanks @yannbf!
CLI: Fix init help for storybook command - #29480, thanks @toothlessdev!
CLI: Fix new-frameworks automigration - #29804, thanks @yannbf!
CLI: Re-Add Nuxt support - #28607, thanks @valentinpalkovic!
CLI: Update a11y-test comment with experimental caveat - #30258, thanks @shilman!
Composition: Fix composed story search - #29453, thanks @jsingh0026!
Composition: Hide contextMenu on composed storybooks - #29803, thanks @ndelangen!
Core / Addon Test: Add config UI to Testing Module - #29708, thanks @ghengeveld!
Core / Addon Test: Support intercepting and modifying internal test provider state updates - #29680, thanks @ghengeveld!
Core + Addon Test: Refactor test API and fix total test count - #29656, thanks @ghengeveld!
Core: Add bun support with npm fallback - #29267, thanks @stephenjason89!
Core: Avoid getting stuck in locked state - #29768, thanks @ghengeveld!
Core: Disable SidebarContextMenu in static builds - #29743, thanks @ndelangen!
Core: Emit deprecated TESTING_MODULE_RUN_ALL_REQUEST for backward compatibility - #29711, thanks @ghengeveld!
Core: Evaluate main config when checking 'whats new' notifications - #29622, thanks @yannbf!
Core: Fix ERR_PACKAGE_PATH_NOT_EXPORTED in @storybook/node-logger - #30093, thanks @JReinhold!
Core: Fix scrollIntoView behavior and reimplement testing module time rendering - #30044, thanks @ghengeveld!
Core: Fix bundling of React - #30003, thanks @yannbf!
Core: Float context menu button on top of story titles in sidebar - #30080, thanks @ghengeveld!
Core: Prevent clipping box shadow on file search modal - #29523, thanks @ghengeveld!
Core: Prevent infinite rerendering caused by comparison by reference - #30081, thanks @ghengeveld!
Docs: Add code snippet to addons panel - #29253, thanks @larsrickert!
Interactions: Correctly load preset when absolute paths are used - #30264, thanks @JReinhold!
Maintenance: Move @types/node to devDeps consistently - #30163, thanks @ndelangen!
Manager API: Fix infinite render-loop caused by useSharedState - #30259, thanks @JReinhold!
Manager: Add tags property to GroupEntry objects - #29672, thanks @Sidnioulz!
Manager: Fix size regression - #29660, thanks @JReinhold!
Manager: Optimize getPanels function with memoization - #30192, thanks @valentinpalkovic!
Next.js: Fix webpack fsCache not working - #29654, thanks @sentience!
Next.js: Support v15.1.1 - #30068, thanks @valentinpalkovic!
Next.js: Upgrade sass-loader from ^13.2.0 to ^14.2.1 - #29264, thanks @HoncharenkoZhenya!
Nextjs-Vite: Add TS docgen support - #29824, thanks @yannbf!
Nextjs-Vite: Fix docgen types in main config - #30042, thanks @yannbf!
Onboarding: Replace react-confetti with @neoconfetti/react - #30098, thanks @ndelangen!
React Native Web: Add framework, CLI integration, sandboxes - #29520, thanks @shilman!
React: Fix RSC compatibility with addon-themes and hooks - #26243, thanks @shilman!
React: Force act running always in sequence - #30191, thanks @valentinpalkovic!
React: Use Act wrapper in Storybook for component rendering - #30037, thanks @valentinpalkovic!
ReactVite: Add @storybook/test as optional peer dependency - #29754, thanks @yannbf!
RNW-Vite: Add built-in Flow support - #29756, thanks @dannyhw!
RNW-Vite: Add tsconfig path aliases support - #29953, thanks @shilman!
RNW-Vite: Fix flow plugin including too many things - #29952, thanks @dannyhw!
RNW-Vite: Fix reanimated support with babel plugin for node_modules - #30188, thanks @dannyhw!
RNW-Vite: Integrate with experimental-addon-test - #29645, thanks @shilman!
Storysource Addon: Fix source-loader prettier imports - #29669, thanks @slax57!
Telemetry: Add metadata distinguishing "apps" from "design systems" - #30070, thanks @tmeasday!
Test: Add coverage feature - #29713, thanks @ndelangen!
TestAddon: Refactor UI & add config options - #29662, thanks @ndelangen!
Toolbars: Suppress deprecation warning when using dynamic icons - #29545, thanks @ValeraS!
UI: Add support for groups to TooltipLinkList and use it in main menu - #29507, thanks @ghengeveld!
UI: Add Yarn to About Section - #29225, thanks @grantwforsythe!
UI: Fix controls and parameters on tag-filtered stories - #30038, thanks @shilman!
UI: Fix overlapping shadow of testing module on scrollbar - #30132, thanks @valentinpalkovic!
UI: Fix test provider event handling on startup - #30083, thanks @ghengeveld!
UI: Keep failing stories in the sidebar, disregarding filters - #30086, thanks @JReinhold!
UI: Sidebar context menu addon API - #29557, thanks @ndelangen!
Vite: Add extra entries to optimizeDeps - #30117, thanks @ndelangen!
Vite: Don't prefix story import with @fs - #28941, thanks @tobiasdiez!
Vite: Fix preview runtime import - #29802, thanks @yannbf!
Vite: Fix wrong import paths when configDir is not in project root - #30206, thanks @JReinhold!
Vite: Import preview runtime as ordinary module - #29172, thanks @tobiasdiez!
Vitest: Add plugins from viteFinal - #30105, thanks @JReinhold!
Vue: Extend sourceDecorator to support v-bind and nested keys in slots - #28787, thanks @JoCa96!
Vue: Fix vue-component-meta docgen HMR not working - #29518, thanks @IonianPlayboy!

</details>