Add native support

packages/eth-deposit-to-different-address/scripts/exec.js

@@ -1,4 +1,4 @@
-const { utils, providers, Wallet } = require('ethers');
+const { utils, providers, Wallet, constants } = require('ethers');
 const { getArbitrumNetwork, EthBridger, EthDepositMessageStatus } = require('@arbitrum/sdk');
 const {
   arbLog,
@@ -38,12 +38,31 @@ const main = async () => {
    */
   const childChainNetwork = await getArbitrumNetwork(childChainProvider);
   const ethBridger = new EthBridger(childChainNetwork);
+  const isCustomGasTokenChain =
+    ethBridger.nativeToken && ethBridger.nativeToken !== constants.AddressZero;
 
   /**
    * First, let's check the balance of the destination address
    */
   const destinationAddressInitialEthBalance = await childChainProvider.getBalance(destAddress);
 
+  /**
+   * For chains that use a custom gas token, we'll have to approve the transfer of native tokens
+   * to pay for the execution of the retryable tickets on the child chain
+   */
+  if (isCustomGasTokenChain) {
+    console.log('Giving allowance to the deployed token to transfer the chain native token');
+    const approvalTransaction = await ethBridger.approveGasToken({
+      erc20ParentAddress: ethBridger.nativeToken,
+      parentSigner: parentChainWallet,
+    });
+
+    const approvalTransactionReceipt = await approvalTransaction.wait();
+    console.log(
+      `Native token approval transaction receipt is: ${approvalTransactionReceipt.transactionHash}`,
+    );
+  }
+
   /**
    * Transfer ether (or native token) from parent chain to a different address on child chain
    * This convenience method automatically queries for the retryable's max submission cost and forwards the appropriate amount to the specified address on the child chain

packages/eth-deposit/scripts/exec.js

@@ -1,4 +1,4 @@
-const { utils, providers, Wallet } = require('ethers');
+const { utils, providers, Wallet, constants } = require('ethers');
 const { getArbitrumNetwork, EthBridger, EthDepositMessageStatus } = require('@arbitrum/sdk');
 const {
   arbLog,
@@ -38,12 +38,31 @@ const main = async () => {
    */
   const childChainNetwork = await getArbitrumNetwork(childChainProvider);
   const ethBridger = new EthBridger(childChainNetwork);
+  const isCustomGasTokenChain =
+    ethBridger.nativeToken && ethBridger.nativeToken !== constants.AddressZero;
 
   /**
    * First, let's check the wallet's initial balance in the child chain
    */
   const initialEthBalance = await childChainWallet.getBalance();
 
+  /**
+   * For chains that use a custom gas token, we'll have to approve the transfer of native tokens
+   * to pay for the execution of the retryable tickets on the child chain
+   */
+  if (isCustomGasTokenChain) {
+    console.log('Giving allowance to the deployed token to transfer the chain native token');
+    const approvalTransaction = await ethBridger.approveGasToken({
+      erc20ParentAddress: ethBridger.nativeToken,
+      parentSigner: parentChainWallet,
+    });
+
+    const approvalTransactionReceipt = await approvalTransaction.wait();
+    console.log(
+      `Native token approval transaction receipt is: ${approvalTransactionReceipt.transactionHash}`,
+    );
+  }
+
   /**
    * Transfer ether (or native token) from parent to child chain
    * This convenience method automatically queries for the retryable's max submission cost and forwards the appropriate amount to the child chain

packages/token-deposit/scripts/exec.js

@@ -1,5 +1,5 @@
 const { ethers } = require('hardhat');
-const { BigNumber, providers, Wallet } = require('ethers');
+const { BigNumber, providers, Wallet, constants } = require('ethers');
 const { getArbitrumNetwork, ParentToChildMessageStatus, Erc20Bridger } = require('@arbitrum/sdk');
 const {
   arbLog,
@@ -50,6 +50,8 @@ const main = async () => {
    */
   const childChainNetwork = await getArbitrumNetwork(childChainProvider);
   const erc20Bridger = new Erc20Bridger(childChainNetwork);
+  const isCustomGasTokenChain =
+    erc20Bridger.nativeToken && erc20Bridger.nativeToken !== constants.AddressZero;
 
   /**
    * We get the address of the parent-chain gateway for our DappToken,
@@ -101,6 +103,24 @@ const main = async () => {
    * (4) childProvider: A provider for the child chain
    */
   console.log('Transferring DappToken to the child chain:');
+
+  /**
+   * For chains that use a custom gas token, we'll have to approve the transfer of native tokens
+   * to pay for the execution of the retryable tickets on the child chain
+   */
+  if (isCustomGasTokenChain) {
+    console.log('Giving allowance to the deployed token to transfer the chain native token');
+    const approvalTransaction = await erc20Bridger.approveGasToken({
+      erc20ParentAddress: erc20Bridger.nativeToken,
+      parentSigner: parentChainWallet,
+    });
+
+    const approvalTransactionReceipt = await approvalTransaction.wait();
+    console.log(
+      `Native token approval transaction receipt is: ${approvalTransactionReceipt.transactionHash}`,
+    );
+  }
+
   const depositTransaction = await erc20Bridger.deposit({
     amount: tokenDepositAmount,
     erc20ParentAddress: tokenAddress,