truffle-config.js

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

module.exports = {
  contracts_build_directory: './ui/src/contracts',
  networks: {
    development: {
      host: '127.0.0.1',
      port: 8545,
      network_id: '*'
    },
    ganache: {
      host: '127.0.0.1',
      port: 7545,
      network_id: '*'
    },
    live: {
      provider: () => {
        return new HDWalletProvider(process.env.MNEMONIC, process.env.RPC_URL);
      },
      network_id: '*',
      // ~~Necessary due to https://github.com/trufflesuite/truffle/issues/1971~~
      // Necessary due to https://github.com/trufflesuite/truffle/issues/3008
      skipDryRun: true
    },
    ropsten: {
      provider: () => {
        return new HDWalletProvider(process.env.MNEMONIC, process.env.RPC_URL);
      },
      network_id: '3',
      // ~~Necessary due to https://github.com/trufflesuite/truffle/issues/1971~~
      // Necessary due to https://github.com/trufflesuite/truffle/issues/3008
      skipDryRun: true
    }
  },
  compilers: {
    solc: {
      version: '0.6.6'
    }
  }
};