exec.js

const { utils, providers, Wallet } = require('ethers')
const {
  EthBridger,
  getL2Network,
  addDefaultLocalNetwork,
  L2ToL1Message,
} = require('@arbitrum/sdk')
const { parseEther } = utils
const { arbLog, requireEnvVariables } = require('arb-shared-dependencies')
require('dotenv').config()
requireEnvVariables(['DEVNET_PRIVKEY', 'L2RPC', 'L1RPC'])

/**
 * Set up: instantiate L2 wallet connected to provider
 */
const walletPrivateKey = process.env.DEVNET_PRIVKEY
const l2Provider = new providers.JsonRpcProvider(process.env.L2RPC)
const l2Wallet = new Wallet(walletPrivateKey, l2Provider)

/**
 * Set the amount to be withdrawn from L2 (in wei)
 */
const ethFromL2WithdrawAmount = parseEther('0.000001')

const main = async () => {
  await arbLog('Withdraw Eth via Arbitrum SDK')

  /**
   * Add the default local network configuration to the SDK
   * to allow this script to run on a local node
   */
  addDefaultLocalNetwork()

  /**
   * Use l2Network to create an Arbitrum SDK EthBridger instance
   * We'll use EthBridger for its convenience methods around transferring ETH from L2 to L1
   */

  const l2Network = await getL2Network(l2Provider)
  const ethBridger = new EthBridger(l2Network)

  /**
   * First, let's check our L2 wallet's initial ETH balance and ensure there's some ETH to withdraw
   */
  const l2WalletInitialEthBalance = await l2Wallet.getBalance()

  if (l2WalletInitialEthBalance.lt(ethFromL2WithdrawAmount)) {
    console.log(
      `Oops - not enough ether; fund your account L2 wallet currently ${l2Wallet.address} with at least 0.000001 ether`
    )
    process.exit(1)
  }
  console.log('Wallet properly funded: initiating withdrawal now')

  /**
   * We're ready to withdraw ETH using the ethBridger instance from Arbitrum SDK
   * It will use our current wallet's address as the default destination
   */

  const withdrawTx = await ethBridger.withdraw({
    amount: ethFromL2WithdrawAmount,
    l2Signer: l2Wallet,
    destinationAddress: l2Wallet.address,
  })
  const withdrawRec = await withdrawTx.wait()

  /**
   * And with that, our withdrawal is initiated! No additional time-sensitive actions are required.
   * Any time after the transaction's assertion is confirmed, funds can be transferred out of the bridge via the outbox contract
   * We'll display the withdrawals event data here:
   */
  console.log(`Ether withdrawal initiated! 🥳 ${withdrawRec.transactionHash}`)

  const withdrawEventsData = await withdrawRec.getL2ToL1Events()
  console.log('Withdrawal data:', withdrawEventsData)
  console.log(
    `To to claim funds (after dispute period), see outbox-execute repo 🫡`
  )
}

main()
  .then(() => process.exit(0))
  .catch(error => {
    console.error(error)
    process.exit(1)
  })