hardhat.config.ts

import dotenv from 'dotenv'
dotenv.config({ path: '.env' })

import { HardhatUserConfig, NetworkUserConfig } from 'hardhat/types'
import '@typechain/hardhat'
import '@nomiclabs/hardhat-ethers'
import '@nomiclabs/hardhat-waffle'
import chains from './chains.json'

type Chain = keyof typeof chains

const HARDHAT_CHAIN_ID = 31337

// Ensure that we have all the environment variables we need.
// Private key is a must for any deployment
const privateKey = process.env.PRIVATE_KEY!
// If the network you want to deploy to requires an Infura key
// specify it in the environment variable INFURA_KEY
const infuraApiKey = process.env.INFURA_API_KEY
// If the network to deploy to is specified
// only that specific network will be used in the hardhat config
const selectedNetwork = process.env.NETWORK

const CHAIN_LIST = (selectedNetwork ? [selectedNetwork] : Object.keys(chains)) as Chain[]

function getChainConfig(network: Chain): NetworkUserConfig | undefined {
	const chainData = chains[network]
	if(chainData) {
		let rpcUrl = chains[network].rpcUrl
		if(rpcUrl.includes('{{infura_key}}')) {
			if(!infuraApiKey) {
				throw new Error('Infura key required to connect to ' + network)
			}

			rpcUrl = rpcUrl.replace('{{infura_key}}', infuraApiKey)
		}

		return {
			accounts: [privateKey!],
			chainId: chains[network].id,
			url: rpcUrl,
			// gasPrice: 499809179185
		}
	}
}

const config: HardhatUserConfig = {
	solidity: {
		version: '0.8.9',
		settings: {
			metadata: {
				// Not including the metadata hash
				// https://github.com/paulrberg/solidity-template/issues/31
				bytecodeHash: 'none',
			},
			// Disable the optimizer when debugging
			// https://hardhat.org/hardhat-network/#solidity-optimizer-support
			optimizer: {
				enabled: true,
				runs: 200,
			},
		}
	},
	networks: {
		...CHAIN_LIST.reduce((dict, chainName) => {
			const config = getChainConfig(chainName)
			if(config) {
				dict[chainName] = config
			}

			return dict
		}, {} as { [C in Chain]: NetworkUserConfig }),
		hardhat: {
			chainId: HARDHAT_CHAIN_ID,
		},
	},
	typechain: {
		outDir: 'src/types',
		target: 'ethers-v5',
	},
}

export default config