truffle.js

require('babel-register')
require('babel-polyfill')

require('dotenv').config();

var HDWalletProvider = require('truffle-hdwallet-provider')

module.exports = {
  solc: {
    optimizer: {
      enabled: true,
      runs: 500
    }
  },
  // 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(
          process.env.MAINNET_MNEMONIC,
          'https://mainnet.infura.io',
          process.env.MAINNET_ACCOUNT_INDEX || 0
        )
      },
      network_id: '*'
    },
    rinkeby: {
      provider: function() {
        return new HDWalletProvider(
          process.env.RINKEBY_MNEMONIC,
          'https://rinkeby.infura.io',
          process.env.RINKEBY_ACCOUNT_INDEX || 0
        )
      },
      gasPrice: 10000000000, // 10 gwei
      gas: 7000000,
      network_id: 4
    },
    ganache: {
      host: 'localhost',
      port: 7545,
      network_id: 5777
    }
  }
}