truffle-config.js

const path = require("path");
//require('dotenv').config();
//const mnemonic = process.env.Mnemonic;
const HDWalletProvider = require("truffle-hdwallet-provider");

// const fs = require('fs');
//const infuraKey = fs.readFileSync("./.infurakey").toString().trim();
//const mnemonic = fs.readFileSync("./.mnemonic").toString().trim();

// Create your own key for Production environments (https://infura.io/)
//const INFURA_ID = 'd6760e62b67f4937ba1ea2691046f06d';
const INFURA_API_KEY = process.env.INFURA_API_KEY;


module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  networks: {
    development: {
      host: "127.0.0.1",
      port: 7545,     // Ganache-GUI
      //port: 8545,   // Ganache-CLI
      network_id: "*",
    },
    // ropsten: {
    //   provider: function() {
    //     return new HDWalletProvider(mnemonic, 'https://ropsten.infura.io/v3/' + infuraKey)
    //     //return new HDWalletProvider(mnemonic, 'https://ropsten.infura.io/v3/' + process.env.INFURA_API_KEY)
    //   },
    //   network_id: '3',
    //   gas: 4465030,
    //   gasPrice: 10000000000,
    // },
    // kovan: {
    //   provider: function() {
    //     return new HDWalletProvider(mnemonic, 'https://kovan.infura.io/v3/' + process.env.INFURA_API_KEY)
    //   },
    //   network_id: '42',
    //   gas: 4465030,
    //   gasPrice: 10000000000,
    // },
    // rinkeby: {
    //   provider: () => new HDWalletProvider(mnemonic, "https://rinkeby.infura.io/v3/${infuraKey}"),
    //   //provider: () => new HDWalletProvider(process.env.MNENOMIC, "https://rinkeby.infura.io/v3/" + process.env.INFURA_API_KEY),
    //   network_id: 4,
    //   gas: 3000000,
    //   gasPrice: 10000000000
    // },
    // // main ethereum network(mainnet)
    // main: {
    //   provider: () => new HDWalletProvider(process.env.MNENOMIC, "https://mainnet.infura.io/v3/" + process.env.INFURA_API_KEY),
    //   network_id: 1,
    //   gas: 3000000,
    //   gasPrice: 10000000000
    // }
  },
  compilers: {
    solc: {
      version: "0.5.4"
    }
  }
};