building-streamlit-custom-components-v2

To build custom Streamlit components with backend state syncing, you create CCv2 components that handle bidirectional data exchange between the frontend and backend. This Skill provides a template-driven workflow ensuring proper data synchronization and secure isolation.

You can prototype Streamlit custom components inline using minimal HTML and JavaScript snippets for rapid demonstrations. Once validated, you can transition to packaged components using Streamlit's official component-template for production deployment and distribution.

You do not strictly need React and TypeScript to create Streamlit custom components. The Skill supports building CCv2 components using either React and TypeScript or vanilla TypeScript, depending on your project requirements and complexity.

The best way to package and distribute Streamlit custom components is using the official component-template with an asset_dir. This packaged approach supports production deployment, testing, and distribution while maintaining best-practice isolation.

You should use custom Streamlit components when core built-in widgets fall short of your UI requirements. CCv2 components enable you to create reusable, interactive frontend elements while keeping the frontend and backend isolated and secure.