const { Client } = require("@hashgraph/sdk"); require("dotenv").config(); async function main() { const myAccountId = process.env.MY_ACCOUNT_ID const myPrivateKey = process.env.MY_PRIVATE_KEY if (myAccountId == null || myPrivateKey == null ) { throw new Error("Environment variables must be present"); } } const client = Client.forTestnet(); client.setOperator(myAccountId, myPrivateKey); // put into async function main() {