truffle.js

let HDWalletProvider = require('truffle-hdwallet-provider')
let { mnemonic, infuraKey } = require('./credentials.json')

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  //
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // match any network
    },
    mainnet: {
      provider: function() {
        return new HDWalletProvider(mnemonic, "https://mainnet.infura.io/" + infuraKey)
      },
      network_id: 1,
      gasPrice: 1000000000,
    },
    rinkeby: {
      provider: function() {
        return new HDWalletProvider(mnemonic, "https://rinkeby.infura.io/" + infuraKey)
      },
      network_id: 4
    }
  }
}