optimistic UI 중 mutateChat 에서 Objects are not valid as a React child (found: Tue Nov 08 2022 17:24:47 GMT+0900 (한국 표준시)). If you meant to render a collection of children, use an array instead.

메시지 부분은 chat 을 말씀하시는걸까요? ㅠ

data.createdAt을 주석처리했더니 에러가 바뀌긴 했어요

근데 에러가 어디서 나는지 알기가 어렵네요..

import React, { memo, useMemo, VFC } from 'react';
import { ChatWrapper } from './styles';
import gravatar from 'gravatar';
import regexifyString from 'regexify-string';
import { Link, useParams } from 'react-router-dom';

interface Props {
  data: any;
}

// a?.b optional chaining
// a??b nullish coalescing

const Chat: VFC<Props> = ({ data }) => {
  const user = data.Sender;
  const { workspace } = useParams<{ workspace: string; channel: string }>();

  const result = useMemo(
    () =>
      regexifyString({
        input: data.content,
        pattern: /@\[(.+?)]\((\d+?)\)|\n/g,
        decorator(match, index) {
          const arr: string[] | null = match.match(/@\[(.+?)]\((\d+?)\)/)!;
          if (arr) {
            return (
              <Link key={match + index} to={`/workspace/${workspace}/dm/${arr[2]}`}>
                @{arr[1]}
              </Link>
            );
          }
          return <br key={index} />;
        },
      }),
    [data.content],
  );

  return (
    <ChatWrapper>
      <div className="chat-img">
        <img src={gravatar.url(user.email, { s: '36px', d: 'retro' })} alt={user.nickname} />
      </div>
      <div className="chat-text">
        <div className="chat-user">
          <b>{user.nickname}</b>
          {/* <span>{data.createdAt}</span> */}
        </div>
        <p>{result}</p>
      </div>
    </ChatWrapper>
  );
};

export default memo(Chat);

import Chat from '@components/chat';
import { ChatZone, Section, StickyHeader } from '@components/chatList/styles';
import { IChat, IDM } from '@typings/db';
import React, { useCallback, forwardRef, ForwardedRef, RefObject, VFC } from 'react';
import { Scrollbars } from 'react-custom-scrollbars';

interface Props {
  chatSections: { [key: string]: IDM[] };
  setSize: (f: (size: number) => number) => Promise<(IDM | IChat)[][] | undefined>;
  isReachingEnd: boolean;
  scrollRef: RefObject<Scrollbars>;
}
const ChatList: VFC<Props> = ({ chatSections, setSize, scrollRef, isReachingEnd }) => {
  const onScroll = useCallback(
    (values: any) => {
      if (values.scrollTop === 0 && !isReachingEnd) {
        console.log('가장 위');
        setSize((prevSize) => prevSize + 1).then(() => {
          // 스크롤 위치 유지
          if (scrollRef?.current) {
            scrollRef.current?.scrollTop(scrollRef.current?.getScrollHeight() - values.scrollHeight);
          }
        });
      }
    },
    [scrollRef, isReachingEnd, setSize],
  );

  return (
    <ChatZone>
      <Scrollbars autoHide ref={scrollRef} onScrollFrame={onScroll}>
        {Object.entries(chatSections).map(([date, chats]) => {
          return (
            <Section className={`section-${date}`} key={date}>
              <StickyHeader>
                <button>{date}</button>
              </StickyHeader>
              {chats.map((chat) => (
                <Chat key={chat.id} data={chat} />
              ))}
            </Section>
          );
        })}
      </Scrollbars>
    </ChatZone>
  );
};

export default ChatList;

import ChatBox from '@components/chatBox';
import ChatList from '@components/chatList';
import useInput from '@hooks/useInput';
import useSocket from '@hooks/useSocket';
import { Container, DragOver, Header } from '@pages/directMessage/styles';
import { IDM } from '@typings/db';
import fetcher from '@utils/fetcher';
import makeSection from '@utils/makeSection';
import axios from 'axios';
import React, { useCallback, useEffect, useRef, useState } from 'react';
import gravatar from 'gravatar';
import Scrollbars from 'react-custom-scrollbars';
import { useParams } from 'react-router-dom';
import useSWR from 'swr';
import useSWRInfinite from 'swr/infinite';
import Workspace from '@layouts/workspace';

const DirectMessage = () => {
  const { workspace, id } = useParams<{ workspace: string; id: string }>();
  console.log(id, 'id');
  const { data: userData } = useSWR(`/api/workspaces/${workspace}/users/${id}`, fetcher);
  const { data: myData } = useSWR('/api/users', fetcher);
  const [chat, onChangeChat, setChat] = useInput('');
  const {
    data: chatData,
    mutate: mutateChat,
    setSize,
  } = useSWRInfinite<IDM[]>(
    (index) => `/api/workspaces/${workspace}/dms/${id}/chats?perPage=20&page=${index + 1}`,
    fetcher,
  );
  const [socket] = useSocket(workspace);
  const isEmpty = chatData?.[0]?.length === 0;
  const isReachingEnd = isEmpty || (chatData && chatData[chatData.length - 1]?.length < 20) || false;
  const scrollbarRef = useRef<Scrollbars>(null);
  const [dragOver, setDragOver] = useState(false);

  const onSubmitForm = useCallback(
    (e: any) => {
      e.preventDefault();
      console.log(chat);
      if (chat?.trim() && chatData) {
        const savedChat = chat;
        mutateChat((prevChatData) => {
          prevChatData?.[0].unshift({
            id: (chatData[0][0]?.id || 0) + 1,
            content: savedChat,
            SenderId: myData.id,
            Sender: myData,
            ReceiverId: userData.id,
            Receiver: userData,
            createdAt: new Date(),
          });
          return prevChatData;
        }, false).then(() => {
          setChat('');
          scrollbarRef.current?.scrollToBottom();
        });

        axios
          .post(`/api/workspaces/${workspace}/dms/${id}/chats`, {
            content: chat,
          })
          .then(() => {
            mutateChat();
          })
          .catch(console.error);
      }
    },
    [chat, chatData, myData, userData, workspace, id],
  );

  const onMessage = useCallback((data: IDM) => {
    // id는 상대방 아이디
    if (data.SenderId === Number(id) && myData.id !== Number(id)) {
      mutateChat((chatData) => {
        chatData?.[0].unshift(data);
        return chatData;
      }, false).then(() => {
        if (scrollbarRef.current) {
          if (
            scrollbarRef.current.getScrollHeight() <
            scrollbarRef.current.getClientHeight() + scrollbarRef.current.getScrollTop() + 150
          ) {
            console.log('scrollToBottom!', scrollbarRef.current?.getValues());
            setTimeout(() => {
              scrollbarRef.current?.scrollToBottom();
            }, 50);
          }
        }
      });
    }
  }, []);

  useEffect(() => {
    socket?.on('dm', onMessage);
    return () => {
      socket?.off('dm', onMessage);
    };
  }, [socket, onMessage]);

  // 로딩 시 스크롤바 제일 아래로
  useEffect(() => {
    if (chatData?.length === 1) {
      setTimeout(() => {
        scrollbarRef.current?.scrollToBottom();
      }, 100);
    }
  }, [chatData]);

  const onDrop = useCallback(
    (e: any) => {
      e.preventDefault();
      console.log(e);
      const formData = new FormData();
      if (e.dataTransfer.items) {
        // Use DataTransferItemList interface to access the file(s)
        for (let i = 0; i < e.dataTransfer.items.length; i++) {
          // If dropped items aren't files, reject them
          if (e.dataTransfer.items[i].kind === 'file') {
            const file = e.dataTransfer.items[i].getAsFile();
            console.log('... file[' + i + '].name = ' + file.name);
            formData.append('image', file);
          }
        }
      } else {
        // Use DataTransfer interface to access the file(s)
        for (let i = 0; i < e.dataTransfer.files.length; i++) {
          console.log('... file[' + i + '].name = ' + e.dataTransfer.files[i].name);
          formData.append('image', e.dataTransfer.files[i]);
        }
      }
      axios.post(`/api/workspaces/${workspace}/dms/${id}/images`, formData).then(() => {
        setDragOver(false);
        mutateChat();
      });
    },
    [mutateChat, workspace, id],
  );

  const onDragOver = useCallback((e: any) => {
    e.preventDefault();
    console.log(e);
    setDragOver(true);
  }, []);

  if (!userData || !myData) {
    return null;
  }

  const chatSections = makeSection(chatData ? chatData.flat().reverse() : []);

  return (
    <Workspace>
      <Container onDrop={onDrop} onDragOver={onDragOver}>
        <Header>
          <img src={gravatar.url(userData.email, { s: '24px', d: 'retro' })} alt={userData.nickname} />
          <span>{userData.nickname}</span>
        </Header>
        <ChatList
          chatSections={chatSections}
          scrollRef={scrollbarRef}
          setSize={setSize}
          isReachingEnd={isReachingEnd}
        />
        <ChatBox chat={chat} onChangeChat={onChangeChat} onSubmitForm={onSubmitForm} />
        {dragOver && <DragOver>업로드!</DragOver>}
      </Container>
    </Workspace>
  );
};

export default DirectMessage;

실제 메시지 부분 코드 보여주셔야 할 것 같습니다. 그리고 거기서 날짜 부분만 빼면 화면 잘 나오는지도 확인해보세요.