I don't know why it does not run and I get an error.
Network and API was declared and ethers.js library was imported.
import { ethers } from "ethers";
const network = "homestead";
const API_KEY = "mykey";
const provider = new ethers.providers.InfuraProvider(network, API_KEY);
const blocknumber = away provider.getBlocknumber();
console.log(blocknumber);