A typed publish-subscribe manager that allows multiple subscribers to be notified with a single event. It provides subscribe/unsubscribe and notify methods, with the ability to capture and replay missed events for late subscribers. This is self-contained and reusable in any project needing lightweight event dispatch without React state overhead.

Merges multiple React refs (callback refs and object refs) into a single callback ref. Correctly handles React 18's null cleanup and React 19's returned cleanup function. This utility solves a common cross-version ref merging problem and can be extracted into any React project with minimal changes.

A hook that memoizes a value by deep-JSON equality rather than reference equality. This prevents unnecessary re-attachments when the incoming value is structurally identical but a new object reference. Useful for stabilizing options objects passed to imperative APIs, and can be reused independently.

Wraps React's forwardRef to preserve generic type parameters through the ref forwarding pattern, which React's built-in forwardRef does not do. This enables fully typed polymorphic components (e.g., <Lottie as="section">) without losing ref typing. A well-known workaround packaged cleanly, extractable for any React 18 codebase.