hardhat.config.ts

import "@nomicfoundation/hardhat-toolbox";
import { config as dotenvConfig } from "dotenv";
import type { HardhatUserConfig } from "hardhat/config";
import type { NetworkUserConfig } from "hardhat/types";
import { resolve } from "path";
import "solidity-docgen";

const dotenvConfigPath: string = process.env.DOTENV_CONFIG_PATH || "./.env";
dotenvConfig({ path: resolve(__dirname, dotenvConfigPath) });

// Ensure that we have all the environment variables we need.
const mnemonic: string | undefined = process.env.MNEMONIC;
if (!mnemonic) {
	throw new Error("Please set your MNEMONIC in a .env file");
}

const chainIds = {
	mainnet: 1,
	polygon: 137,
	arbitrum: 42161,
	avalanche: 43114,
	bsc: 56,
	optimism: 10,
	"polygon-mumbai": 80001,
	sepolia: 11155111,
	arb_sepolia: 421614,
	goerli: 5,
	chiado: 10200,
	"celo-testnet": 44787,
	hardhat: 1,
};

function getChainConfig(chain: keyof typeof chainIds): NetworkUserConfig {
	let jsonRpcUrl: string;
	switch (chain) {
		case "mainnet":
			jsonRpcUrl = "https://eth.llamarpc.com";
			break;
		case "arbitrum":
			jsonRpcUrl = "https://arb1.arbitrum.io/rpc";
			break;
		case "polygon":
			jsonRpcUrl = "https://polygon.llamarpc.com";
			break;
		case "avalanche":
			jsonRpcUrl = "https://api.avax.network/ext/bc/C/rpc";
			break;
		case "bsc":
			jsonRpcUrl = "https://bsc-dataseed1.binance.org";
			break;
		case "polygon-mumbai":
			jsonRpcUrl = "https://polygon-mumbai-bor.publicnode.com";
			break;
		case "goerli":
			jsonRpcUrl = "https://ethereum-goerli.publicnode.com";
			break;
		case "sepolia":
			jsonRpcUrl = "https://rpc.notadegen.com/eth/sepolia";
			break;
		case "arb_sepolia":
			jsonRpcUrl = "https://sepolia-rollup.arbitrum.io/rpc";
			break;
		case "chiado":
			jsonRpcUrl = "https://rpc.chiado.gnosis.gateway.fm";
			break;
		case "celo-testnet":
			jsonRpcUrl = "https://alfajores-forno.celo-testnet.org";
			break;
		default:
			jsonRpcUrl = "https://matic-mumbai.chainstacklabs.com"; // https://matic-mumbai.chainstacklabs.com
	}
	return {
		accounts: {
			count: 10,
			mnemonic,
			path: "m/44'/60'/0'/0",
		},
		chainId: chainIds[chain],
		url: jsonRpcUrl,
	};
}

const config: HardhatUserConfig = {
	networks: {
		hardhat: {
			accounts: {
				mnemonic,
			},
			chainId: chainIds.hardhat,
		},
		mainnet: getChainConfig("mainnet"),
		polygon: getChainConfig("polygon"),
		arbitrum: getChainConfig("arbitrum"),
		avalanche: getChainConfig("avalanche"),
		bsc: getChainConfig("bsc"),
		optimism: getChainConfig("optimism"),
		"polygon-mumbai": getChainConfig("polygon-mumbai"),
		goerli: getChainConfig("goerli"),
		sepolia: getChainConfig("sepolia"),
		arb_sepolia: getChainConfig("arb_sepolia"),
		chiado: getChainConfig("chiado"),
		"celo-testnet": getChainConfig("celo-testnet"),
	},
	paths: {
		artifacts: "./artifacts",
		cache: "./cache",
		sources: "./contracts",
		tests: "./test",
	},
	etherscan: {
		apiKey: process.env.ARBITRUM_API_KEY,
		customChains: [
			{
				network: "arb_sepolia",
				chainId: 421614,
				urls: {
					apiURL: "https://sepolia.arbiscan.io/api",
					browserURL: "https://sepolia.arbiscan.io",
				},
			},
		],
	},
	sourcify: {
		// Disabled by default
		// Doesn't need an API key
		enabled: true,
	},
	solidity: {
		version: "0.8.23",
		settings: {
			metadata: {
				// Not including the metadata hash
				// https://github.com/paulrberg/hardhat-template/issues/31
				bytecodeHash: "none",
			},
			// Disable the optimizer when debugging
			// https://hardhat.org/hardhat-network/#solidity-optimizer-support
			optimizer: {
				enabled: true,
				runs: 20000,
			},
		},
	},
	gasReporter: {
		enabled: true,
		currency: "USD", // currency to show
		outputFile: "gas-report.txt", // optional
		noColors: true, //optional
		coinmarketcap: process.env.COINMARKETCAP_API_KEY, //to fetch gas data
		gasPrice: 1,
	},
};

export default config;