fp-ts React ref proxy

ref.option.tsx

function refProxy<T>(
  ref: React.MutableRefObject<T>
): React.MutableRefObject<T> & { current: O.Option<T> } {
  const p = new Proxy(
    ref as React.MutableRefObject<T> & { current: O.Option<T> },
    {
      get: (target, prop) => {
        if (prop === "current") {
          return O.fromNullable(target.current);
        }
        return (target as any)[prop];
      }
    }
  );

  return p;
}

function useSafeRef<T>() {
  return refProxy(React.useRef<T | null>(null));
}

how to assign to ref.current ?