import { PromptTemplate } from "langchain/prompts";
import { ChatOpenAI } from "langchain/chat_models/openai";

const model = new ChatOpenAI({});
const promptTemplate = PromptTemplate.fromTemplate(
  "Tell me a joke about {topic}"
);

const chain = promptTemplate.pipe(model);

const result = await chain.batch([{ topic: "bears" }, { topic: "cats" }]);

console.log(result);
/*
  [
    AIMessage {
      content: "Why don't bears wear shoes?\n\nBecause they have bear feet!",
    },
    AIMessage {
      content: "Why don't cats play poker in the wild?\n\nToo many cheetahs!"
    }
  ]
*/