LibreChat/src/components/main/Message.jsx

import React, { useEffect } from 'react';
import { useSelector } from 'react-redux';
import GPTIcon from '../svg/GPTIcon';
// import useCustomEffect from '~/hooks/useCustomEffect';

export default function Message({
  sender,
  text,
  last = false,
  error = false,
  scrollToBottom
}) {
  const { isSubmitting } = useSelector((state) => state.submit);
  const blinker = isSubmitting && last && sender === 'GPT';

  useEffect(() => {
    if (blinker) {
      scrollToBottom();
    }
  }, [isSubmitting, text]);

  const props = {
    className:
      'w-full border-b border-black/10 dark:border-gray-900/50 text-gray-800 dark:text-gray-100 group dark:bg-gray-800'
  };

  if (sender === 'GPT') {
    props.className =
      'w-full border-b border-black/10 dark:border-gray-900/50 text-gray-800 dark:text-gray-100 group bg-gray-100 dark:bg-[#444654]';
  }

  return (
    <div {...props}>
      <div className="m-auto flex gap-4 p-4 text-base md:max-w-2xl md:gap-6 md:py-6 lg:max-w-2xl lg:px-0 xl:max-w-3xl">
        <strong className="relative flex w-[30px] flex-col items-end">
          {sender === 'GPT' ? (
            <div
              style={{ backgroundColor: 'rgb(16, 163, 127)' }}
              className="relative flex h-[30px] w-[30px] items-center justify-center rounded-sm p-1 text-white"
            >
              <GPTIcon />
            </div>
          ) : (
            `${sender}:`
          )}
        </strong>
        <div className="relative flex w-[calc(100%-50px)] flex-col gap-1 whitespace-pre-wrap md:gap-3 lg:w-[calc(100%-115px)]">
          <div className="flex flex-grow flex-col gap-3">
            {!!error ? (
              <div className="flex flex min-h-[20px] flex-row flex-col items-start gap-4 gap-2 whitespace-pre-wrap text-red-500">
                <div className="rounded-md border border-red-500 bg-red-500/10 py-2 px-3 text-sm text-gray-600 dark:text-gray-100">
                  {text}
                </div>
              </div>
            ) : (
              <span>
                {text}
                {blinker && <span className="result-streaming">█</span>}
              </span>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}