getAddData

function getAddData(message: AddMessage): {
  domain: {
    readonly chainId: 10;
    readonly name: "Farcaster KeyGateway";
    readonly verifyingContract: "0x00000000fC56947c7E7183f8Ca4B62398CaAdf0B";
    readonly version: "1";
  };
  message: AddMessage;
  primaryType: "Add";
  types: {
    readonly Add: readonly [
      { readonly name: "owner"; readonly type: "address" },
      { readonly name: "keyType"; readonly type: "uint32" },
      { readonly name: "key"; readonly type: "bytes" },
      { readonly name: "metadataType"; readonly type: "uint8" },
      { readonly name: "metadata"; readonly type: "bytes" },
      { readonly name: "nonce"; readonly type: "uint256" },
      { readonly name: "deadline"; readonly type: "uint256" },
    ];
  };
};