truffle-config.js

require("dotenv").config();
const HDWalletProvider = require("truffle-hdwallet-provider");

require("babel-register");
require("babel-polyfill");

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*" // Match any network id
    },
    kovan: {
      provider: () =>
        new HDWalletProvider(
          process.env.MNENOMIC,
          "https://kovan.infura.io/v3/" + process.env.INFURA_API_KEY
        ),
      network_id: 42,
      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
    }
  },
  contracts_directory: "./contracts/",
  contracts_build_directory: "./src/abis/",
  compilers: {
    solc: {
      optimizer: {
        enabled: true,
        runs: 200
      }
    }
  }
};