vercel-composition-patterns

Replace boolean props with explicit variant components that compose shared internals. Create separate components like ThreadComposer or EditComposer, each composing only the pieces it needs from a compound component structure.

Compound components are structured as a parent provider with subcomponents that access shared state via context instead of props. Consumers compose exactly the pieces they need, like Composer.Frame, Composer.Input, and Composer.Submit, without hidden conditionals.

Prefer children for composing static structure since they are more readable and compose naturally. Use render props only when the parent needs to pass data back to the child, such as rendering list items.

No, React 19 makes ref a regular prop, so forwardRef is unnecessary. The use() hook also replaces useContext() and can be called conditionally, unlike useContext.

Lift state into a provider when sibling components outside the main UI need access to that state or its actions. This avoids prop drilling, useEffect syncing, and ref-based workarounds for sharing state across component boundaries.