helper-hardhat-config.js

const networkConfig = {
    31337: {
        name: "localhost",
        ethUsdPriceFeed: "0x694AA1769357215DE4FAC081bf1f309aDC325306",
        gasLane: "0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c", // 30 gwei
        mintFee: "10000000000000000", // 0.01 ETH
        callbackGasLimit: "500000", // 500,000 gas
    },
    // Price Feed Address, values can be obtained at https://docs.chain.link/data-feeds/price-feeds/addresses
    11155111: {
        name: "sepolia",
        ethUsdPriceFeed: "0x694AA1769357215DE4FAC081bf1f309aDC325306",
        vrfCoordinatorV2: "0x8103B0A8A00be2DDC778e6e7eaa21791Cd364625",
        gasLane: "0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c",
        callbackGasLimit: "500000", // 500,000 gas
        mintFee: "10000000000000000", // 0.01 ETH
        subscriptionId: "1002", // add your ID here!
    },
}

const DECIMALS = "18"
const INITIAL_PRICE = "200000000000000000000"
const developmentChains = ["hardhat", "localhost"]

module.exports = {
    networkConfig,
    developmentChains,
    DECIMALS,
    INITIAL_PRICE,
}