polkadot.js script for upgrading a parachain

upgrade.js

import { ApiPromise, WsProvider, Keyring } from '@polkadot/api'
import { cryptoWaitReady } from '@polkadot/util-crypto'
import { readFileSync } from 'fs';

async function connect(port, types) {
	const provider = new WsProvider('ws://127.0.0.1:' + port)
	const api = new ApiPromise({ provider, types })
	await api.isReady
	return api
}

async function main() {
	if (process.argv.length != 4) {
		console.error("wrong number of arguments");
		return;
	}

  // The RPC port of the parachain.
	let port = parseInt(process.argv[2]);
  
  // The filename of the runtime/PVF we want to upgrade to. Usually a file
  // with `.compact.compressed.wasm` extension.
	let filename = process.argv[3];
	console.log(`upgrading the chain with the ${filename}`);

	let code = readFileSync(filename).toString('hex');

	await cryptoWaitReady()
	let api = await connect(port, {})

	const keyring = new Keyring({ type: "sr25519" });
	const alice = keyring.addFromUri("//Alice");

	const unsub = await api.tx.sudo
		.sudoUncheckedWeight(api.tx.system.setCodeWithoutChecks(`0x${code}`), 1)
		.signAndSend(alice, (result) => {
			console.log(`Current status is ${result.status}`);
			if (result.status.isInBlock) {
				console.log(
					`Transaction included at blockHash ${result.status.asInBlock}`
				);
			} else if (result.status.isFinalized) {
				console.log(
					`Transaction finalized at blockHash ${result.status.asFinalized}`
				);
			} else if (result.isError) {
				console.log(`Transaction Error`);
			}
		});
}

main().catch(console.error)