helper-hardhat-config.js

const networkConfig = {
    31337: {
      name: "localhost",
      ethUsdPriceFeed: "0x9326BFA02ADD2366b30bacB125260Af641031331",
      gasLane:
        "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", // 30 gwei
      mintFee: "10000000000000000", // 0.01 ETH
      callbackGasLimit: "500000", // 500,000 gas
    },
    // Price Feed Address, values can be obtained at https://docs.chain.link/docs/reference-contracts
    5: {
      name: "goerli",
      ethUsdPriceFeed: "0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e",
      vrfCoordinatorV2: "0x2Ca8E0C643bDe4C2E08ab1fA0da3401AdAD7734D",
      gasLane:
        "0x79d3d8832d904592c0bf9818b621522c988bb8b0c05cdc3b15aea1b6e8db0c15",
      callbackGasLimit: "500000", // 500,000 gas
      mintFee: "10000000000000000", // 0.01 ETH
      subscriptionId: "1002", // add your ID here!
    },
  
    56: {
      name: "bsc",
      allowUnlimitedContractSize: true,
      gasLimit: 3e7,
    },
  
    42161: {
      name: "arbitrumOne",
      allowUnlimitedContractSize: true,
      gasLimit: 3e7,
    },
  };
  
  const DECIMALS = "18";
  const INITIAL_PRICE = "200000000000000000000";
  const developmentChains = ["hardhat", "localhost"];
  
  module.exports = {
    networkConfig,
    developmentChains,
    DECIMALS,
    INITIAL_PRICE,
  };