truffle-config.js

const path = require('path');
require('dotenv').config();
const HDWalletProvider = require('@truffle/hdwallet-provider');

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  contracts_build_directory: path.join(__dirname, 'client/src/contracts'),
  networks: {
    develop: {
      port: 7545,
    },
    test: {
      host: 'localhost',
      port: 8545,
      network_id: '*',
    },
    rinkeby: {
      provider: () => new HDWalletProvider(process.env.MNEMONIC, `wss://rinkeby.infura.io/ws/v3/${process.env.RINKEBY_INFURA_API_KEY}`),
      network_id: 4, // Rinkeby's id
      gas: 5500000, // Rinkeby 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 )
    },
  },
  compilers: {
    solc: {
      version: '0.8.10',
      settings: {
        optimizer: {
          enabled: true,
          runs: 1000,
        },
      },
    },
  },
};