Sign Typed Data

import { MiniKit } from "@worldcoin/minikit-js";
import type {
  CommandResultByVia,
  MiniAppSignTypedDataSuccessPayload,
  MiniKitSignTypedDataOptions,
} from "@worldcoin/minikit-js/commands";

export async function signTypedData() {
  const input = {
    primaryType: "Mail",
    domain: {
      name: "Example",
      version: "1",
      chainId: 480,
    },
    types: {
      EIP712Domain: [
        { name: "name", type: "string" },
        { name: "version", type: "string" },
        { name: "chainId", type: "uint256" },
      ],
      Mail: [
        { name: "contents", type: "string" },
      ],
    },
    message: {
      contents: "Hello world",
    },
  } satisfies MiniKitSignTypedDataOptions;

  const result: CommandResultByVia<MiniAppSignTypedDataSuccessPayload> =
    await MiniKit.signTypedData(input);

  console.log(result.data.signature);
}

type MiniKitSignTypedDataOptions = {
  types: TypedData;
  primaryType: string;
  message: Record<string, unknown>;
  domain?: TypedDataDomain;
  chainId?: number;
  fallback?: () => unknown;
};

type SignTypedDataResponse =
  | {
      executedWith: "minikit" | "wagmi";
      data: {
        status: "success";
        version: number;
        signature: string;
        address: string;
      };
    }
  | {
      executedWith: "fallback";
      data: unknown;
    };

{
  "executedWith": "minikit",
  "data": {
    "status": "success",
    "version": 1,
    "signature": "0xabcdef1234567890",
    "address": "0x1234567890123456789012345678901234567890"
  }
}