import { ChatPrem } from "@langchain/community/chat_models/premai";import { HumanMessage } from "@langchain/core/messages";const model = new ChatPrem({ // In Node.js defaults to process.env.PREM_API_KEY apiKey: "YOUR-API-KEY", // In Node.js defaults to process.env.PREM_PROJECT_ID project_id: "YOUR-PROJECT_ID",});console.log(await model.invoke([new HumanMessage("Hello there!")]));