type ReturnDataType = Uint8Array & { readonly [brand]: "ReturnData" };

import * as ReturnData from '@tevm/voltaire/primitives/ReturnData';

// From hex string
const data = ReturnData.fromHex("0x00000001");

// From bytes
const bytes = new Uint8Array([0, 0, 0, 1]);
const data = ReturnData.from(bytes);

import * as ReturnData from '@tevm/voltaire/primitives/ReturnData';

// Parse contract return data
const returnData = ReturnData.fromHex("0x0000000000000000000000000000000000000000000000000000000000000001");

if (!ReturnData.isEmpty(returnData)) {
  console.log("Data:", ReturnData.toHex(returnData));
}