helper-hardhat-config.js

const { ethers } = require("hardhat")
require("dotenv").config()

const networkConfig = {
    4: {
        name: "rinkeby",
        vrfCoordinatorV2Address: "0x6168499c0cFfCaCD319c818142124B7A15E857ab",
        entranceFee: ethers.utils.parseEther("0.01"),
        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", //30 gwei Key Hash
        subscriptionId: process.env.CHAINLINK_SUBSCRIBTION_ID,
        callbackGasLimit: "500000", // 500 000
        interval: "300", //300 sec
    },
    31337: {
        name: "hardhat",
        entranceFee: ethers.utils.parseEther("1"),
        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", // mocks doesn't care what lane we use
        callbackGasLimit: "500000",
        interval: "30", //30 sec
    },
}

const developmentChains = ["hardhat", "localhost"]

const BASE_FEE = ethers.utils.parseEther("0.25") //0.25 LINK - "premium" section at chainlink docs
const GAS_LINK_PRICE = 1e9 // 1000000000 // link per gas, calculated value based on the gas price on the chain

module.exports = {
    networkConfig,
    developmentChains,
    BASE_FEE,
    GAS_LINK_PRICE,
}