vercel-composition-patterns

Replace boolean props with composition by creating explicit variant components like ThreadComposer or EditComposer. Each variant composes shared compound component pieces instead of relying on conditional logic inside one monolithic component.

Compound components are structured as a parent provider with subcomponents that access shared state via context rather than props. Consumers compose exactly the pieces they need, such as Composer.Frame, Composer.Input, and Composer.Submit.

Use children when composing static structure because they are more readable and compose naturally. Reserve render props for cases where the parent must pass data back to the child, such as rendering list items.

No, React 19 makes ref a regular prop, so forwardRef is no longer needed. The guidance also recommends using use() instead of useContext(), which can additionally be called conditionally.

Lift state into a dedicated provider component that wraps the siblings. Any component inside the provider boundary can access state and actions via context, even if it is not visually nested inside the main UI.