truffle-config.js

const path = require('path');
const provider = require('@truffle/hdwallet-provider');
const fs = require('fs');
const secrets = JSON.parse(fs.readFileSync('.secrets.json').toString().trim());
module.exports = {
  contracts_build_directory: path.join(__dirname, './src/contracts'),

  /**
   * 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: {
    kovan: {
      provider: () => new provider(secrets.privateKeys, secrets.kovanUrl, 0, 1),
      network_id: 42,
    },
  },

  // 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)
  // },
  // Useful for deploying to a public network.
  // NB: It's important to wrap the provider as a function.
  // ropsten: {
  // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
  // network_id: 3,       // Ropsten's id
  // gas: 5500000,        // Ropsten has a lower block limit than mainnet
  // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
  // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
  // skipDryRun: true     // 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: '0.8.0', // 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"
      // }
    },
  },
};