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 fs = require('fs');

const HDWalletProvider = require('truffle-hdwallet-provider');
const infuraMainnet = fs.readFileSync(".infura").toString().trim();
const mnemonic = fs.readFileSync(".secret").toString().trim();

module.exports = {
  networks: {
    development: {
     host: "127.0.0.1",     // Localhost (default: none)
     port: 8545,            // Standard Ethereum port (default: none)
     network_id: "*",       // Any network (default: none)
    },
    mainnet: {
      provider: () => new HDWalletProvider(mnemonic, infuraMainnet),
      network_id: 1,       // Mainnet's id
      gas: 8000000,        // Mainnet gas limit
      gasPrice: 5000000000,
      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 )
    }
  },
  compilers: {
    solc: {
      version: "^0.5.11",
      settings: {
        optimizer: {
          enabled: true,
          runs: 5000000   // Optimize for how many times you intend to run the code
        }
      }
    }
  }
}