import { keccak256, toHex } from "viem";

// ExampleERC20Mintable uses OpenZeppelin AccessControl
// The MINTER_ROLE must be granted to the staking manager
// so it can mint reward tokens for validators

const MINTER_ROLE = keccak256(toHex("MINTER_ROLE"));

const hash = await walletClient.writeContract({
  address: "0x..." as `0x${string}`,
  abi: ExampleERC20MintableABI,
  functionName: "grantRole",
  args: [
    MINTER_ROLE,
    "0x..." // Staking Manager
  ],
});

await publicClient.waitForTransactionReceipt({ hash });