truffle-config.js

require('dotenv').config();

// OpenZeppelin public network deployment guide
// https://docs.openzeppelin.com/sdk/2.6/public-deploy

const mnemonic = process.env.MNEMONIC;
const HDWalletProvider = require('truffle-hdwallet-provider');
// Create your own key for Production environments (https://infura.io/)
const INFURA_ID = process.env.INFURA_ID || 'd6760e62b67f4937ba1ea2691046f06d';


const configNetwork = (network, networkId, path = "m/44'/60'/0'/0/", gas = 4465030, gasPrice = 1e10) => ({
  provider: () => new HDWalletProvider(
    mnemonic, `https://${network}.infura.io/v3/${INFURA_ID}`,
    0, 1, true, path,
  ),
  networkId,
  gas,
  gasPrice,
});

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!

  plugins: [
    'truffle-security', // MythX plugin
    'solidity-coverage', // https://github.com/sc-forks/solidity-coverage
  ],

  networks: {
    development: {
      host: '127.0.0.1',
      port: 8545,
      network_id: '*',
    },
    ropsten: configNetwork('ropsten', 3),
    kovan: configNetwork('kovan', 42),
    rinkeby: configNetwork('rinkeby', 4),
    main: configNetwork('mainnet', 1),
  },

  // Configure compiler settings
  compilers: {
    solc: {
      // 0.5.12 is the version used by Dai
      version: '0.5.12', // Fetch exact version from solc-bin (default: truffle's version)
      settings: { // See the solidity docs for advice about optimization and evmVersion
        optimizer: {
          enabled: false,
          runs: 200,
        },
        // evmVersion: 'byzantium',
      },
    },
  },
};