truffle-config.js

/**
 * Use this file to configure your truffle project. It's seeded with some
 * common settings for different networks and features like migrations,
 * compilation and testing. Uncomment the ones you need or modify
 * them to suit your project as necessary.
 *
 * More information about configuration can be found at:
 *
 * truffleframework.com/docs/advanced/configuration
 *
 * To deploy via Infura you'll need a wallet provider (like truffle-hdwallet-provider)
 * to sign your transactions before they're sent to a remote public node. Infura accounts
 * are available for free at: infura.io/register.
 *
 * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
 * public/private key pairs. If you're publishing your code to GitHub make sure you load this
 * phrase from a file you've .gitignored so it doesn't accidentally become public.
 *
 */

const HDWalletProvider = require('truffle-hdwallet-provider');
const config = require('./env.json');
const privateKey = config.ACCOUNT.PRIVATEKEY;
const address =  config.ACCOUNT.ADDRESS;
//
// const fs = require('fs');
// const mnemonic = fs.readFileSync(".secret").toString().trim();

module.exports = {
  /**
   * Networks define how you connect to your ethereum client and let you set the
   * defaults web3 uses to send transactions. If you don't specify one truffle
   * will spin up a development blockchain for you on port 9545 when you
   * run `develop` or `test`. You can ask a truffle command to use a specific
   * network from the command line, e.g
   *
   * $ truffle test --network <network-name>
   */

  networks: {
    // Useful for testing. The `development` name is special - truffle uses it by default
    // if it's defined here and no other network is specified at the command line.
    // You should run a client (like ganache-cli, geth or parity) in a separate terminal
    // tab if you use this network and you must also set the `host`, `port` and `network_id`
    // options below to some value.
    //
    development: {
      provider: () => new HDWalletProvider(privateKey, config.RPC),
      network_id: 89,
      gasPrice: 10000000000000, // default gas price in wei, 20 gwei in this case,
      gas: '30000000',
      websockets: true,
      from: address,
      // production: true 
    },
    private: {
      provider: () => new HDWalletProvider(privateKey, 'http://localhost:8545'),
      network_id: 88,
      gasPrice: 10000000000000, // default gas price in wei, 20 gwei in this case,
      gas: '30000000',
      websockets: true,
      from: address,
      // production: true
    },
    // Another network with more advanced options...
    // advanced: {
      // port: 8777,             // Custom port
      // network_id: 1342,       // Custom network
      // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
      // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
      // from: <address>,        // Account to send txs from (default: accounts[0])
      // websockets: true        // Enable EventEmitter interface for web3 (default: false)
    // },

    // Useful for deploying to a public network.
    // NB: It's important to wrap the provider as a function.
    // tomotest: {
    //   provider: () => new HDWalletProvider(privateKey, 'https://testnet.tomochain.com'),
    //   network_id: 89,
    //   gasPrice: '250000000', // default gas price in wei, 20 gwei in this case,
    //   gas: '1000000',
    //   websockets: true,
    //   from: address
    // },

    // Useful for private networks
    // private: {
      // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
      // network_id: 2111,   // This network is yours, in the cloud.
      // production: true    // Treats this network as if it was a public net. (default: false)
    // }
  },

  // Set default mocha options here, use special reporters etc.
  mocha: {
    // timeout: 100000
  },

  // Configure your compilers
  compilers: {
    solc: {
      version: "0.5.0",    // Fetch exact version from solc-bin (default: truffle's version)
      docker: false,        // Use "0.5.1" you've installed locally with docker (default: false)
      settings: {          // See the solidity docs for advice about optimization and evmVersion
       optimizer: {
         enabled: true,
         runs: 200
       },
       evmVersion: "byzantium"
      }
    }
  }
}