HelperConfig.s.sol Explained

[JuanPedro0410]

import {MockV3Aggregator} from "../test/mocks/MockV3Aggregator.sol";
import {Script} from "forge-std/Script.sol";

Here I import the tools for the contract. The MockV3Aggregator is a contract that simulate the pricefeed on a local blockchain.
The script has some tools to make script contracts.

contract HelperConfig is Script {
}

Create the contract that inherits from Script.sol contract

	NetworkConfig public activeNetworkConfig;

    uint8 public constant DECIMALS = 8;
    int256 public constant INITIAL_PRICE = 2000e8;

Create the variables for ther contract. the first one is a variable of type networkConfig that will we used to store the network that is used.
The 2 last variables store 2 parameters for a function.

    struct NetworkConfig {
        address priceFeed; // ETH/USD pricefeed address
    }

create the type NetworkConfig that when you create a variable or store something in, you must to pass an address called priceFeed. That this will we what stores the function.

    constructor() {
        if (block.chainid == 11155111) {
            activeNetworkConfig = getSepoliaEthConfig();
        } else {
            activeNetworkConfig = getOrCreateAnvilEthConfig();
        }
    }

in the constructor you check if the chainId of the network is the chainId of sepolia, if it is correct makes activeNetworkConfig equals to getSepoliaEthConfig() that returns a network config
else it execute getOrCreateAnvilEthConfig() that deploy or if it has been deployed run the code, of a contract that simulate a pricefeed on a local enviroment and returns the network local config