Favor React's built-in types over custom interfaces when possible, and consolidate to standard library types for better maintainability and type safety. Use `PropsWithChildren` instead of creating custom component prop interfaces, leverage generics for type flexibility, and migrate away from deprecated types in favor of type-safe alternatives. Example: ```ts // Instead of custom interface export interface LayoutComponentProps { children: ReactNode } // Use built-in React type export type LayoutComponentProps = PropsWithChildren; // For additional props, extend with generics export type LayoutComponentProps = PropsWithChildren<{ extraProp: string; }>; // Use generics for flexibility export type RouteManifest = Record< string, R | undefined >; ``` This approach reduces code duplication, improves type safety, leverages React's established patterns, and makes the codebase more maintainable by using well-tested standard types.