Feature: Adding tags via langchain calls about lunary HOT 5 CLOSED

import { ChatOpenAI } from "@langchain/openai";
import { ChatPromptTemplate } from "@langchain/core/prompts";
import { StringOutputParser } from "@langchain/core/output_parsers";
import { LunaryHandler } from "lunary/langchain";

const handler = new LunaryHandler();

const prompt = ChatPromptTemplate.fromMessages([
  ["human", "Tell me a short joke about {topic}"],
]);
const model = new ChatOpenAI({});
const outputParser = new StringOutputParser();

const chain = prompt.pipe(model).pipe(outputParser);

const response = await chain.invoke(
  {
    topic: "ice cream",
  },
  {
    callbacks: [handler],
    tags: ["tag1", "tag2"],
  }
);
console.log(response);