function domain(
  chainId: number,
  verifyingContract: string
): TypedDataDomain

import { domain } from "@cowprotocol/contracts";

const settlementDomain = domain(
  1, // Ethereum mainnet
  "0x9008D19f58AAbD9eD0D60971565AA8510560ab41"
);

console.log(settlementDomain);
// {
//   name: "Gnosis Protocol",
//   version: "v2",
//   chainId: 1,
//   verifyingContract: "0x9008D19f58AAbD9eD0D60971565AA8510560ab41"
// }

interface TypedDataDomain {
  name?: string;
  version?: string;
  chainId?: number;
  verifyingContract?: string;
  salt?: string;
}