Storybook 10: ESM-Only Support, 29% Lighter with Module Automocking

Introduction

Storybook 10 introduces ESM-only support and a 29% size reduction, enhancing performance for frontend developers with modern workflows.

Performance and Modernization

Storybook 10's ESM-only architecture enables better tree-shaking and faster installations. It improves compatibility with popular IDE environments and streamlines integration with CI/CD pipelines.

Advanced Testing Capabilities

Collaboration with Vitest brings automocking for easier testing across Vite and Webpack, reducing setup time. Developers appreciate simplified testing with debugging tools.

Enhanced Component Authoring

CSF Factories now in Preview offer better type safety and autocompletion, streamlining story creation. This complements code linting workflows and integrates with version control systems.

Pros and Cons

Advantages

• 29% smaller package size for faster installations
• ESM-only support aligns with modern JavaScript standards
• Automated module mocking simplifies testing setup
• Enhanced type safety with CSF Factories
• Improved framework support for Svelte and Next.js
• Better development workflow with tag-based story exclusion
• Compatibility with latest tooling versions

Disadvantages

• ESM-only approach breaks CommonJS configurations
• Migration required for existing Storybook projects
• Learning curve for new automocking system
• Potential compatibility issues with older tooling

Conclusion

Storybook 10 advances modern JavaScript development with ESM support, performance gains, and improved testing, making migration worthwhile for teams committed to frontend workflows.