truffle.js

const HDWalletProvider = require("truffle-hdwallet-provider");
const MNEMONIC = process.env.MNEMONIC
const INFURA_KEY = process.env.INFURA_KEY

if (!MNEMONIC || !INFURA_KEY) {
  console.error("Please set a mnemonic and infura key.")
  return
}

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      gas: 4600000,
      network_id: "*" // Match any network id
    },
    rinkeby: {
      provider: function() {
        return new HDWalletProvider(
          MNEMONIC,
          "https://rinkeby.infura.io/" + INFURA_KEY
        );
      },
      network_id: "*",
      gas: 4000000
    },
    live: {
      network_id: 1,
      provider: function() {
        return new HDWalletProvider(
          MNEMONIC,
          "https://mainnet.infura.io/" + INFURA_KEY
        );
      },
      gas: 4000000,
      gasPrice: 50000000000
    },
    mocha: {
      reporter: 'eth-gas-reporter',
      reporterOptions : {
        currency: 'USD',
        gasPrice: 2
      }
    }
  }
};