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 providerFactory = () => {
  return new HDWalletProvider(
    [process.env.MNEMONIC_PHRASE],
    process.env.NETWORK_ENDPOINT,
  )
}


module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545, // 7545
      network_id: "*",
    },
    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,
      skipDryRun: true
    },
    kovan: {
      // provider: providerFactory(),
      network_id: 42,
      gas: 8000000,      // Make sure this gas allocation isn't over 4M, which is the max
      gasPrice: 30000000000, // 30 gwei,
      skipDryRun: true
    },
    rinkeby: {
      // provider: providerFactory(),
      network_id: 4,
      gas: 8000000      //  Sure this gas allocation isn't over 4M, which is the max
    }
  },
  compilers: {
    solc: {
      version: '0.8.0+commit.c7dfd78e',
      settings: {
        optimizer: {
          enabled: true,
          runs: 100000
        }
      }
    }
  },
  mocha: {
    useColors: true
  },
  plugins: ["truffle-contract-size"]
}