delegate-sign.js

const createDelegateBySigMessage = (compAddress, delegatee, expiry = 10e9, chainId = 1, nonce = 0) => {
  const types = {
    EIP712Domain: [
      { name: 'name', type: 'string' },
      { name: 'chainId', type: 'uint256' },
      { name: 'verifyingContract', type: 'address' },
    ],
    Delegation: [
      { name: 'delegatee', type: 'address' },
      { name: 'nonce', type: 'uint256' },
      { name: 'expiry', type: 'uint256' }
    ]
  };

  const primaryType = 'Delegation';
  const domain = { name: 'Compound', chainId, verifyingContract: compAddress };
  const message = { delegatee, nonce, expiry };

  return JSON.stringify({ types, primaryType, domain, message });
};