hardhat.config.ts

import '@nomiclabs/hardhat-ethers';
import 'hardhat-deploy';
import dotenv from 'dotenv';
import type {HardhatUserConfig, HttpNetworkUserConfig} from 'hardhat/types';
import yargs from 'yargs';

const argv = yargs
  .option('network', {
    type: 'string',
    default: 'hardhat'
  })
  .help(false)
  .version(false).argv;

// Load environment variables.
dotenv.config();
const {NETWORK, NODE_URL, INFURA_KEY, MNEMONIC, PK, SOLIDITY_VERSION, SOLIDITY_SETTINGS} = process.env;

const DEFAULT_MNEMONIC = 'candy maple cake sugar pudding cream honey rich smooth crumble sweet treat';

const sharedNetworkConfig: HttpNetworkUserConfig = {};
if (PK) {
  sharedNetworkConfig.accounts = [PK];
} else {
  sharedNetworkConfig.accounts = {
    mnemonic: MNEMONIC || DEFAULT_MNEMONIC
  };
}

if (['mainnet', 'rinkeby', 'kovan', 'goerli'].includes(argv.network) && INFURA_KEY === undefined) {
  throw new Error(`Could not find Infura key in env, unable to connect to network ${argv.network}`);
}

import './src/tasks';

const primarySolidityVersion = SOLIDITY_VERSION || '0.7.6';
const soliditySettings = !!SOLIDITY_SETTINGS ? JSON.parse(SOLIDITY_SETTINGS) : undefined;

const userConfig: HardhatUserConfig = {
  paths: {
    artifacts: 'build/artifacts',
    cache: 'build/cache',
    sources: 'contracts'
  },
  solidity: {
    compilers: [{version: primarySolidityVersion, settings: soliditySettings}, {version: '0.6.12'}, {version: '0.5.17'}]
  },
  networks: {
    hardhat: {
      allowUnlimitedContractSize: true,
      blockGasLimit: 100000000,
      gas: 100000000
    },
    mainnet: {
      ...sharedNetworkConfig,
      url: `https://mainnet.infura.io/v3/${INFURA_KEY}`
    },
    xdai: {
      ...sharedNetworkConfig,
      url: 'https://xdai.poanetwork.dev'
    },
    ewc: {
      ...sharedNetworkConfig,
      url: `https://rpc.energyweb.org`
    },
    rinkeby: {
      ...sharedNetworkConfig,
      url: `https://rinkeby.infura.io/v3/${INFURA_KEY}`
    },
    goerli: {
      ...sharedNetworkConfig,
      url: `https://goerli.infura.io/v3/${INFURA_KEY}`
    },
    kovan: {
      ...sharedNetworkConfig,
      url: `https://kovan.infura.io/v3/${INFURA_KEY}`
    },
    volta: {
      ...sharedNetworkConfig,
      url: `https://volta-rpc.energyweb.org`
    },
    bsc: {
      ...sharedNetworkConfig,
      url: `https://bsc-dataseed.binance.org/`
    }
  },
  namedAccounts: {
    deployer: 0,
    first: 1,
    second: 2
  },
  mocha: {
    timeout: 2000000
  }
};
if (NETWORK) {
  userConfig.defaultNetwork = NETWORK;
}
if (NODE_URL) {
  userConfig.networks!!.custom = {
    ...sharedNetworkConfig,
    url: NODE_URL
  };
}
export default userConfig;