native-base/src/utils/mergeRefs.ts

Essential cross-platform UI components for React Native

export function mergeRefs<T = any>(
  refs: Array<React.MutableRefObject<T> | React.LegacyRef<T>>
): React.RefCallback<T> {
  return (value) => {
    refs.forEach((ref) => {
      if (typeof ref === 'function') {
        ref(value);
      } else if (ref != null) {
        (ref as React.MutableRefObject<T | null>).current = value;
      }
    });
  };
}

export function composeEventHandlers<E>(
  originalEventHandler?: null | ((event: E) => void),
  ourEventHandler?: (event: E) => void
) {
  return function handleEvent(event: E) {
    originalEventHandler?.(event);
    ourEventHandler?.(event);
  };
}