Storybook 10.0 - October 2025

Storybook 10 contains one breaking change: it’s ESM-only. This simplifies our distribution and reduces install size by 29% while simultaneously unminifying dist code for easier debugging.

It also includes features to level up your UI development, documentation, and testing workflows:

• 🧩 Module automocking for easier testing
• 🏭 Typesafe CSF factories Preview for React
• 💫 UI editing and sharing optimizations
• 🏷️ Tag filtering exclusion and configuration for sidebar management
• 🔀 Svelte async component support and more

This is a major release, so there are tons of little fixes and improvements. Browse the changelogs for the full list of changes.

There are breaking changes. Please refer to our Migration guide to upgrade from pre-10.0 of Storybook.