react-widgets/esm/WidgetHelpers.js

import { useRef } from 'react';
let idCount = 0;

function uniqueId(prefix) {
  return '' + ((prefix == null ? '' : prefix) + ++idCount);
}

export function notify(handler, args) {
  // eslint-disable-next-line prefer-spread
  if (handler) handler.apply(null, args);
}
export const useInstanceId = (otherId, suffix = '') => {
  const id = useRef();
  if (!id.current) id.current = uniqueId('rw_');
  return (otherId || id.current) + suffix;
};
/**
 * Allows for defering popup rendering untill the widget is focused,
 * or has been opened (in order to not remove it suddenly on close)
 */

export function useFirstFocusedRender(focused, open) {
  const ref = useRef(false);
  return ref.current || (focused || !!open) && (ref.current = true);
}