Get counterfactual address of an AA Smart Wallet before deployment

get_counterFactualAddress.js

import { BigNumberish, ethers } from 'ethers'
import { KernelFactory__factory, EntryPoint__factory } from '@zerodevapp/contracts-new'

const ENTRYPOINT_ADDRESS = '0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789'
const KERNEL_FACTORY_ADDRESS = '0x4E4946298614FC299B50c947289F4aD0572CB9ce'

async function getKernelWalletAddress(factoryAddress: string, entryPointAddress: string, provider: ethers.providers.BaseProvider, signerWalletAddress: string, index: BigNumberish): Promise<string> {
  const factory = KernelFactory__factory.connect(
    factoryAddress,
    provider
  );
  const entryPoint = EntryPoint__factory.connect(entryPointAddress, provider);
  try {
    const initCode = ethers.utils.hexConcat([
      factory.address,
      factory.interface.encodeFunctionData("createAccount", [
        signerWalletAddress,
        index
      ]),
    ]);
    await entryPoint.callStatic.getSenderAddress(initCode);

    throw new Error("getSenderAddress: unexpected result");
  } catch (error: any) {
    const addr = error?.errorArgs?.sender;
    if (!addr) throw error;

    return addr;
  }
}