seaport-signature-request.js

  const types = {
    OrderComponents: [
      { name: "offerer", type: "address" },
      { name: "zone", type: "address" },
      { name: "offer", type: "OfferItem[]" },
      { name: "consideration", type: "ConsiderationItem[]" },
      { name: "orderType", type: "uint8" },
      { name: "startTime", type: "uint256" },
      { name: "endTime", type: "uint256" },
      { name: "zoneHash", type: "bytes32" },
      { name: "salt", type: "uint256" },
      { name: "conduitKey", type: "bytes32" },
      { name: "counter", type: "uint256" }
    ],
    OfferItem: [
      { name: "itemType", type: "uint8" },
      { name: "token", type: "address" },
      { name: "identifierOrCriteria", type: "uint256" },
      { name: "startAmount", type: "uint256" },
      { name: "endAmount", type: "uint256" }
    ],
    ConsiderationItem: [
      { name: "itemType", type: "uint8" },
      { name: "token", type: "address" },
      { name: "identifierOrCriteria", type: "uint256" },
      { name: "startAmount", type: "uint256" },
      { name: "endAmount", type: "uint256" },
      { name: "recipient", type: "address" }
    ]
  };