truffle.js

const HDWalletProvider = require('truffle-hdwallet-provider')
const fs = require('fs')

// First read in the secrets.json to get our mnemonic
let secrets
let mnemonic
if (fs.existsSync('secrets.json')) {
  secrets = JSON.parse(fs.readFileSync('secrets.json', 'utf8'))
  mnemonic = secrets.mnemonic
} else {
  console.log('No secrets.json found. If you are trying to publish EPM ' +
              'this will fail. Otherwise, you can ignore this message!')
  mnemonic = ''
}

module.exports = {
  networks: {
    development: { // truffle test hardcodes the "test" network.
      host: 'localhost',
      port: '8545',
      network_id: 'default',
      gas: 6699331
    },
    ropsten: {
      provider: new HDWalletProvider(mnemonic, 'https://ropsten.infura.io'),
      network_id: '3'
    },
    testrpc: {
      network_id: 'default'
    }
  }
}