Storybook 9.1 is packed with new features and improvements to enhance accessibility, streamline testing, and make your development workflow even smoother!

🚀 Improved upgrade command with monorepo support for seamless upgrades 🅰 Angular fixes for Tailwind 4, cache busting, and zoneless compatibility 🧪 sb.mock API and Automocking: one-line module mocking to simplify your testing workflow 🧪 Favicon shows test run status for quick visual feedback ⚛️ Easier configuration for React Native projects 🔥 Auto-abort play functions on HMR to avoid unwanted side effects 🏗️ Improved CSF factories API for type safe story definitions ♿️ A11y improvements across Storybook’s UI — addon panel, toolbar, sidebar, mobile & more 💯 Dozens more fixes and improvements based on community feedback!

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

A11y: Improved toolbar a11y by fixing semantics - #28672, thanks @mehm8128!
Addon Vitest: Remove Optimize deps candidates due to Vitest warnings - #31809, thanks @valentinpalkovic!
Angular: Bundle using TSup - #31690, thanks @ndelangen!
Angular: Prevent directory import in Angular builders - #32012, thanks @ghengeveld!
Automigration: Await updateMainConfig in removeEssentials - #32140, thanks @valentinpalkovic!
Builder-Vite: Fix logic related to setting allowedHosts when IP address used - #31472, thanks @JSMike!
Controls: Improve the accessibility of the object control - #31581, thanks @Sidnioulz!
Core: Abort play function on HMR - #31542, thanks @ghengeveld!
Core: Avoid pausing animations in non-Vitest Playwright environments - #32123, thanks @ghengeveld!
Core: Cleanup of type following up v9 and small verbatimModuleSyntax type fix - #31823, thanks @alcpereira!
Core: Fix aria-controls attribute on sidebar nodes to include all children - #31491, thanks @candrepa1!
Core: Fix horizontal scrollbar covering part of the toolbar - #31704, thanks @Sidnioulz!
Core: Fix moving log file across drives and projectRoot detection on Windows - #32020, thanks @ghengeveld!
Core: Prevent interactions panel from flickering and showing incorrect state - #32150, thanks @ghengeveld!
Core: Serve dynamic favicon based on testing module status - #31763, thanks @ghengeveld!
Core: Support container queries in addon panels - #23261, thanks @neil-morrison44!
CSF Factories: Add parameters/globals types, extend API, portable stories - #30601, thanks @kasperpeulen!
CSF: Improve controls parameters - #31745, thanks @kasperpeulen!
CSF: Improve docs parameter types - #31736, thanks @kasperpeulen!
CSF: Only add preview annotations to definePreview in csf-factories automigration - #31727, thanks @kasperpeulen!
Docs: Update @storybook/icons - #32144, thanks @valentinpalkovic!
Docs: Update react-element-to-jsx-string - #31170, thanks @7rulnik!
Init: Exclude mdx stories when docs feature isn't selected during init - #32142, thanks @valentinpalkovic!
Maintenance: Add flag to toggle default automigrations - #32113, thanks @yannbf!
React Native Web: Simplify config by using vite-plugin-rnw - #32051, thanks @dannyhw!
Telemetry: Add automigration errors - #32103, thanks @yannbf!
Telemetry: Fix project.json for getAbsolutePath - #31510, thanks @ndelangen!
Test: Add mock capabilities - #31987, thanks @valentinpalkovic!
Test: Consider exports map - #32157, thanks @valentinpalkovic!
Test: Fix missing source map for Webpack/Vite mock loaders and plugins - #32111, thanks @valentinpalkovic!
Test: Invalidate vite cache for manual mocks - #32152, thanks @valentinpalkovic!
Test: Remove source map generation from webpack automock-loader - #32115, thanks @valentinpalkovic!
UI: Apply user updates for mobile navigation accessibility - #31401, thanks @yatishgoel!
UI: Fix interaction step collapse icon - #31853, thanks @AvitalHass!
UI: Visual focus indicators (VFIs) aren't visible in high contrast mode (rebase) - #31848, thanks @Sidnioulz!

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