truffle-config.js

require("dotenv").config();
const Web3 = require("web3");
const web3 = new Web3();

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

module.exports = {
    networks: {
        mainnet: {
            provider: () => new HDWalletProvider(process.env.KEY, process.env.PROVIDER),
            network_id: 1, // mainnet
            gas: 2000000,
            gasPrice: 65000000000, // check https://ethgasstation.info/
            confirmations: 2, // # of confs to wait between deployments. (default: 0)
            timeoutBlocks: 200, // # of blocks before a deployment times out  (minimum/default: 50)
            skipDryRun: false, // Skip dry run before migrations? (default: false for public nets )
        },
        rinkeby: {
            provider: function() {
                return new HDWalletProvider(process.env.MNEMONIC, process.env.PROVIDER);
            },
            network_id: 4,
            gas: 10000000,
            networkCheckTimeout: 100000000,
            timeoutBlocks: 200
        },
        kovan: {
            provider: function() {
                return new HDWalletProvider(process.env.MNEMONIC, process.env.PROVIDER);
            },
            network_id: 42,
            networkCheckTimeout: 100000000,
        },
        coverage: {
            host: "127.0.0.1",
            port: 8555,
            network_id: "*",
        },
        ganache: {
            host: '127.0.0.1',
            port: 7545,
            network_id: 5777
        }
    },
    plugins: ["solidity-coverage"],
    compilers: {
        solc: {
            version: "0.5.13",
            //docker: true,
            settings: {
                optimizer: {
                    enabled: true,
                    runs: 200,
                },
            },
        },
    },
};