Building a production-ready AI chat interface in React requires more than just displaying messages. You need streaming responses, markdown rendering, code highlighting, error handling, and a polished UX. Here's the complete implementation.

Core Chat Component

`typescript

// ChatWindow.tsx

import React, { useState, useRef, useEffect } from 'react';

import ReactMarkdown from 'react-markdown';

import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter';

interface Message {

id: string;

role: 'user' | 'assistant';

content: string;

timestamp: Date;

}

interface ChatWindowProps {

apiKey: string;

model?: string;

}

export function ChatWindow({ apiKey, model = 'claude-3-5-sonnet-20241022' }: ChatWindowProps) {

const [messages, setMessages] = useState([]);

const [input, setInput] = useState('');

const [isLoading, setIsLoading] = useState(false);

const [error, setError] = useState(null);

const messagesEndRef = useRef(null);

const scrollToBottom = () =>…