Some EVM methods require you to pass a EVM WalletAccount object. If you want to check if a certain wallet account is a EVM WalletAccount, you can use the isEvmWalletAccount helper method to avoid type errors. 
import { isEvmWalletAccount } from '@dynamic-labs-sdk/evm';
import { createWalletClientForWalletAccount } from '@dynamic-labs-sdk/evm/viem';

const sendTransaction = async (walletAccount, transaction) => {
  if (!isEvmWalletAccount(walletAccount)) {
    throw new Error('This wallet account is not a EVM wallet account');
  }

  const walletClient = await createWalletClientForWalletAccount({ walletAccount });
  const result = await walletClient.sendTransaction(transaction);
  console.log('Transaction sent:', result);

  // ...
}