truffle-config.js

const path = require("path");

// HDWalletProvider dependencies
require("dotenv").config({path: ".env"});
const HDWalletProvider = require("@truffle/hdwallet-provider");
const mnemonic="";
const accountIndex = 0;

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  contracts_build_directory: path.join(__dirname, "client/src/contracts"),
  networks: {
    development: {
      port: 7545,
      network_id: "5777",
      host: "127.0.0.1"
    },
    ganache_local: {
      provider: function(){
        return new HDWalletProvider(process.env.MNEMONIC, "http://127.0.0.1:7545", accountIndex);
      },
      network_id: "5777",
    },
    ropsten_infura: {
      provider: function(){
        return new HDWalletProvider(process.env.MNEMONIC, "wss://ropsten.infura.io/ws/v3/55b797fcd6a14623ab86d63ad2518bf8", accountIndex);
      },
      network_id: "3",
    }
  },  
  compilers: {
    solc: {
      version: "0.6.12"
    }
  }
};