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 MNEMONIC = process.env.MNEMONIC;
const INFURA_KEY = process.env.INFURA_KEY;

const needsInfura = process.env.npm_config_argv.includes('rinkeby') ||
  process.env.npm_config_argv.includes('live');

if ((!MNEMONIC || !INFURA_KEY) && needsInfura) {
  console.error('Please set a mnemonic and infura key.');
  process.exit(0);
}

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: {
      host: 'localhost',
      port: 7545,
      gas: 4600000,
      network_id: '*' // Match any network id
    },
    
    rinkeby: {
      provider: function() {
        return new HDWalletProvider(
          MNEMONIC,
          "https://rinkeby.infura.io/v3/" + INFURA_KEY
        );
      },
      network_id: "*",
      gas: 4600000
    },

    live: {
      network_id: 1,
      provider: function() {
        return new HDWalletProvider(
          MNEMONIC,
          "https://mainnet.infura.io/v3/" + INFURA_KEY
        );
      },
      gas: 4000000,
      gasPrice: 20000000000
    }
  },

  // Set default mocha options here, use special reporters etc.
  mocha: {
    reporter: 'eth-gas-reporter',
    reporterOptions : {
      currency: 'USD',
      gasPrice: 2
    }
  },

  // Configure your compilers
  compilers: {
    solc: {
      version: "0.5.12"
      // docker: true,        // 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: false,
      //    runs: 200
      //  },
      //  evmVersion: "byzantium"
      // }
    }
  }
};