Rocket.Chat/apps/meteor/client/views/hooks/useMemberExists.ts

import { useEndpoint } from '@rocket.chat/ui-contexts';
import { useQuery } from '@tanstack/react-query';

type UseMemberExistsProps = { roomId: string; username: string };

export const useMemberExists = ({ roomId, username }: UseMemberExistsProps) => {
	const checkMember = useEndpoint('GET', '/v1/rooms.isMember');

	return useQuery({
		queryKey: ['rooms/isMember', roomId, username],
		queryFn: () => checkMember({ roomId, username }),
	});
};