truffle-config.js

require("babel-register");
require("babel-polyfill");
const fs = require("fs");
const NonceTrackerSubprovider = require("web3-provider-engine/subproviders/nonce-tracker");

const HDWalletProvider = require("truffle-hdwallet-provider");

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*", // Match any network id
      gas: 7900000
    },
    mainnet: {
      host: "localhost",
      port: 8545,
      network_id: "1", // Match any network id
      gas: 7900000,
      gasPrice: 10000000000
    },
    ropsten: {
      // provider: new HDWalletProvider(privKey, "http://localhost:8545"),
      host: "localhost",
      port: 8545,
      network_id: "3", // Match any network id
      gas: 4500000,
      gasPrice: 150000000000
    },
    rinkeby: {
      // provider: new HDWalletProvider(privKey, "http://localhost:8545"),
      host: "localhost",
      port: 8545,
      network_id: "4", // Match any network id
      gas: 7500000,
      gasPrice: 10000000000
    },
    kovan: {
      provider: () => {
        const key = fs.readFileSync("./privKey").toString();
        let wallet = new HDWalletProvider(key, "https://kovan.infura.io/");
        var nonceTracker = new NonceTrackerSubprovider();
        wallet.engine._providers.unshift(nonceTracker);
        nonceTracker.setEngine(wallet.engine);
        return wallet;
      },
      network_id: "42", // Match any network id
      gas: 7900000,
      gasPrice: 5000000000
    },
    coverage: {
      host: "localhost",
      network_id: "*",
      port: 8545, // <-- If you change this, also set the port option in .solcover.js.
      gas: 0xfffffffff, // <-- Use this high gas value
      gasPrice: 0x01 // <-- Use this low gas price
    }
  },
  compilers: {
    solc: {
      version: "0.5.8",
      settings: {
        optimizer: {
          enabled: true,
          runs: 200
        }
      }
    }
  },
  mocha: {
    enableTimeouts: false
  }
};