Class FileSystemChatMessageHistory

Example

 const model = new ChatOpenAI({
  model: "gpt-3.5-turbo",
  temperature: 0,
});
const prompt = ChatPromptTemplate.fromMessages([
  [
    "system",
    "You are a helpful assistant. Answer all questions to the best of your ability.",
  ],
  ["placeholder", "chat_history"],
  ["human", "{input}"],
]);

const chain = prompt.pipe(model).pipe(new StringOutputParser());
const chainWithHistory = new RunnableWithMessageHistory({
  runnable: chain,
 inputMessagesKey: "input",
 historyMessagesKey: "chat_history",
  getMessageHistory: async (sessionId) => {
    const chatHistory = new FileSystemChatMessageHistory({
      sessionId: sessionId,
      userId: "userId",  // Optional
    })
    return chatHistory;
  },
});
await chainWithHistory.invoke(
  { input: "What did I just say my name was?" },
  { configurable: { sessionId: "session-id" } }
);
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