truffle-config.js

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

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: {
      host: "127.0.0.1",
      port: 8545,
      network_id: "*"
    },
    ganache: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*"
    },
    rinkeby: {
      provider: () =>
        new HDWalletProvider({
          mnemonic: {
            phrase: process.env.MNEMONIC,
          },
          providerOrUrl: process.env.RPC_URL,
          numberOfAddresses: 1,
          shareNonce: true,
          derivationPath: "m/44'/1'/0'/0/"
        }),
      network_id: 4,       // Rinkeby's id
      gas: 5500000,        // Rinkeby has a lower block limit than mainnet
      confirmations: 3,    // # 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",
    }
  }
};