stream-chat-react-native-core/src/hooks/useIsDirectChat.ts

The official React Native and Expo components for Stream Chat, a service for building chat applications

import { useMemo } from 'react';

import type { Channel } from 'stream-chat';

import { useChannelMembersState } from '../components/ChannelList/hooks/useChannelMembersState';
import { useChatContext } from '../contexts';

export const useIsDirectChat = (channel?: Channel) => {
  const { client } = useChatContext();
  const ownUserId = client.userID;
  const members = useChannelMembersState(channel);

  const otherMembers = useMemo(
    () => Object.values(members ?? {}).filter((member) => member.user?.id !== ownUserId),
    [members, ownUserId],
  );

  return otherMembers.length === 1;
};