Approve for Permit2

import { ethers } from "ethers";

const ERC20_ABI = [
  "function approve(address spender, uint256 value) external returns (bool)",
];

async function approvePermit2(
  tokenAddress: string,
  permit2Address: string,
  signer: ethers.Signer,
): Promise<ethers.TransactionReceipt> {
  const token = new ethers.Contract(tokenAddress, ERC20_ABI, signer);
  const transaction = await token.approve(permit2Address, ethers.MaxUint256);
  const receipt = await transaction.wait();

  if (!receipt) {
    throw new Error("The Permit2 approval transaction did not produce a receipt");
  }

  return receipt;
}