hardhat.networks.js

const networks = {};
const etherscan = { apiKey: {} };

function register (name, chainId, url, privateKey, etherscanNetworkName, etherscanKey) {
    if (url && privateKey && etherscanKey) {
        networks[name] = {
            url,
            chainId,
            accounts: [privateKey],
        };
        etherscan.apiKey[etherscanNetworkName] = etherscanKey;
        console.log(`Network '${name}' registered`);
    } else {
        console.log(`Network '${name}' not registered`);
    }
}

register(
    'mainnet',
    1,
    process.env.MAINNET_RPC_URL,
    process.env.MAINNET_PRIVATE_KEY,
    'mainnet',
    process.env.MAINNET_ETHERSCAN_KEY,
);
register('bsc', 56, process.env.BSC_RPC_URL, process.env.BSC_PRIVATE_KEY, 'bsc', process.env.BSC_ETHERSCAN_KEY);
register(
    'kovan',
    42,
    process.env.KOVAN_RPC_URL,
    process.env.KOVAN_PRIVATE_KEY,
    'kovan',
    process.env.KOVAN_ETHERSCAN_KEY,
);
register(
    'optimistic',
    10,
    process.env.OPTIMISTIC_RPC_URL,
    process.env.OPTIMISTIC_PRIVATE_KEY,
    'optimisticEthereum',
    process.env.OPTIMISTIC_ETHERSCAN_KEY,
);
register(
    'matic',
    137,
    process.env.MATIC_RPC_URL,
    process.env.MATIC_PRIVATE_KEY,
    'polygon',
    process.env.MATIC_ETHERSCAN_KEY,
);
register(
    'arbitrum',
    42161,
    process.env.ARBITRUM_RPC_URL,
    process.env.ARBITRUM_PRIVATE_KEY,
    'arbitrumOne',
    process.env.ARBITRUM_ETHERSCAN_KEY,
);
register('xdai', 100, process.env.XDAI_RPC_URL, process.env.XDAI_PRIVATE_KEY, 'xdai', process.env.XDAI_ETHERSCAN_KEY);
register(
    'avax',
    43114,
    process.env.AVAX_RPC_URL,
    process.env.AVAX_PRIVATE_KEY,
    'avalanche',
    process.env.AVAX_ETHERSCAN_KEY,
);
register(
    'fantom',
    250,
    process.env.FANTOM_RPC_URL,
    process.env.FANTOM_PRIVATE_KEY,
    'opera',
    process.env.FANTOM_ETHERSCAN_KEY,
);
register(
    'aurora',
    1313161554,
    process.env.AURORA_RPC_URL,
    process.env.AURORA_PRIVATE_KEY,
    'aurora',
    process.env.AURORA_ETHERSCAN_KEY,
);

module.exports = {
    networks,
    etherscan,
};