truffle-config.js

const path = require('path');
const envPath = path.join(__dirname, './.env');
require('dotenv').config({ path: envPath });

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

const providerFactory = () => {
	return new HDWalletProvider(
		process.env.MNEMONIC_PHRASE,
		process.env.NETWORK_ENDPOINT,
		0,
		10
	  )
  }

module.exports = {
	// Uncommenting the defaults below 
	// provides for an easier quick-start with Ganache.
	// You can also follow this format for other networks;
	// see <http://truffleframework.com/docs/advanced/configuration>
	// for more details on how to specify configuration options!
	//
	networks: {
		// development: {
		// 	host: "127.0.0.1",
		// 	port: 8545, // 7545
		// 	network_id: "*",
		// 	// gas: 0x1ffffffffffffe
		// },
		development: {
			host: "127.0.0.1",
			port: 8545,
			network_id: "*",
			// gas: 0x1ffffffffffffe
			websockets: true,        // Enable EventEmitter interface for web3 (default: false)
		},
		mainnet: {
			provider: providerFactory(),
			network_id: 1,
			gas: 8000000,
			gasPrice: 115000000000, // 115 gwei,
		},
		ropsten: {
			provider: providerFactory(),
			network_id: 3,
			gas: 8000000,      // Make sure this gas allocation isn't over 4M, which is the max
			gasPrice: 30000000000, // 30 gwei,
		},
		rinkeby: {
			provider: providerFactory(),
			network_id: 4,
			gas: 8000000      //  Sure this gas allocation isn't over 4M, which is the max
		}
	},
	compilers: {
		solc: {
			version: "0.6.11",
			settings: {
				optimizer: {
					enabled: true,
					runs: 100000
				}
			}
		}
	},
	mocha: {
		useColors: true
	},
	plugins: ["truffle-contract-size"]
};