@itwin/itwinui-react/esm/utils/hooks/useIsClient.js

A react component library for iTwinUI

import * as React from 'react';
export const useIsClient = () => {
  let [isClient, setIsClient] = React.useState(false);
  React.useEffect(() => {
    setIsClient(true);
  }, []);
  return isClient;
};