truffle-config.js

const HDWalletProvider = require('@truffle/hdwallet-provider');
require("dotenv").config({
  path: __dirname + '/.env'
});

module.exports = {
  networks: {
    // development: {
    //  host: "127.0.0.1",
    //  port: 8545,
    //  network_id: "*",
    // },

    kovan: {
      provider: () => new HDWalletProvider(
        process.env.PRIVATEKEY,
        `https://kovan.infura.io/v3/${process.env.INFURA_ID}`,
        0, //address_index
        10, // num_addresses
        true // shareNonce
      ),
      network_id: 42, // Kovan's id
      gas: 3000000,
      //confirmations: 2, // # of confs to wait between deployments. (default: 0)
      timeoutBlocks: 50, // # of blocks before a deployment times out  (minimum/default: 50)
      // skipDryRun: false // Skip dry run before migrations? (default: false for public nets )
    },

    ropsten: {
      provider: () => new HDWalletProvider(
        process.env.PRIVATEKEY,
        `https://ropsten.infura.io/v3/${process.env.INFURA_ID}`,
        0,
        10,
        true
      ),
      network_id: 3,
      gas: 3000000,
      timeoutBlocks: 50,
    },

    mainnet: {
      provider: () => new HDWalletProvider(
        process.env.PRIVATEKEY,
        `https://mainnet.infura.io/v3/${process.env.INFURA_ID}`,
        0, //address_index
        10, // num_addresses
        true // shareNonce
      ),
      network_id: 1, // mainnet's id
      gas: 3000000, // max gaslimit
      // gasPrice: +process.env.MAINNET_GAS_PRICE || 1000*1000*1000, // default 1 gwei
      //confirmations: 2, // # of confs to wait between deployments. (default: 0)
      timeoutBlocks: 50, // # of blocks before a deployment times out  (minimum/default: 50)
      skipDryRun: false // Skip dry run before migrations? (default: false for public nets )
    }
  },

  mocha: {
    // timeout: 100000
  },

  compilers: {
    solc: {
      version: "0.6.12",
      // docker: true,
      settings: {
        optimizer: {
          enabled: true,
          runs: 200
        },
        //  evmVersion: "byzantium"
      }
    }
  },

  plugins: [
    "solidity-coverage",
  ],
}