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import { createAgent } from 'langchain'
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const agent = createAgent({
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  model,
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  tools: [],
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  systemPrompt: '你是一名简洁的前端开发助手。',
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})
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09
const stream = await agent.stream({
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  messages: [{ role: 'user', content: '请介绍一下 React。' }],
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}, {
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  streamMode: 'messages',
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})
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for await (const [messageChunk] of stream) {
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  process.stdout.write(messageChunk.text)
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}