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');
require("dotenv").config({
  path: __dirname + '/.env'
});

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: "127.0.0.1",     // Localhost (default: none)
     port: 8545,            // Standard Ethereum port (default: none)
     network_id: "*",       // Any network (default: none)
    },

    // 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)
    // },

    kovan: {
      provider: () => new HDWalletProvider(
          process.env.MNEMONIC,
          process.env.KOVAN_PROVIDER_URL,
          0, //address_index
          10, // num_addresses
          true // shareNonce
      ),
      network_id: 42, // Kovan's id
      //gas: 7017622, //
      //confirmations: 2, // # of confs to wait between deployments. (default: 0)
      timeoutBlocks: 50, // # of blocks before a deployment times out  (minimum/default: 50)
      // skipDryRun: false // Skip dry run before migrations? (default: false for public nets )
    },

    mainnet: {
      provider: () => new HDWalletProvider(
          process.env.MNEMONIC,
          process.env.MAINNET_PROVIDER_URL,
          0, //address_index
          10, // num_addresses
          true // shareNonce
      ),
      network_id: 1, // mainnet's id
      gas: 8000000, // max gaslimit
      gasPrice: +process.env.MAINNET_GAS_PRICE || 1000*1000*1000, // default 1 gwei
      //confirmations: 2, // # of confs to wait between deployments. (default: 0)
      timeoutBlocks: 50, // # of blocks before a deployment times out  (minimum/default: 50)
      skipDryRun: false // Skip dry run before migrations? (default: false for public nets )
    },
    // 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: "0.5.16",    // Fetch exact version from solc-bin (default: truffle's version)
      // 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"
      }
    }
  },

  plugins: [
    "solidity-coverage",
    "truffle-plugin-verify"
  ],

  api_keys: {
    etherscan: process.env.ETHERSCAN_API_KEY
  },
}