truffle-config.js

const path = require("path");
// const HDWalletProvider = require('@truffle/hdwallet-provider');
// const infuraKey = "fj4jll3k.....";
//
// const fs = require('fs');
// const mnemonic = fs.readFileSync(".secret").toString().trim();

module.exports = {
  /**
   * Networks define how you connect to your ethereum client and let you set the
   * defaults web3 uses to send transactions. If you don't specify one truffle
   * will spin up a development blockchain for you on port 9545 when you
   * run `develop` or `test`. You can ask a truffle command to use a specific
   * network from the command line, e.g
   *
   * $ truffle test --network <network-name>
   */

  contracts_build_directory: path.join(__dirname, "client/src/contracts"),
  networks: {
    develop: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*" // Match any network id
    },
    test: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*"
    }
  // Useful for deploying to a public network.
  // NB: It's important to wrap the provider as a function.
  // ropsten: {
  // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
  // network_id: 3,       // Ropsten's id
  // gas: 5500000,        // Ropsten 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 )
  // },

  // Useful for private networks
  // private: {
  // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
  // network_id: 2111,   // This network is yours, in the cloud.
  // production: true    // Treats this network as if it was a public net. (default: false)
  // }
},

  // Set default mocha options here, use special reporters etc.
  mocha: {
  // timeout: 100000
},

// Configure your compilers
compilers: {
  solc: {
    // version: "0.5.1",    // Fetch exact version from solc-bin (default: truffle's version)
    // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
    // settings: {          // See the solidity docs for advice about optimization and evmVersion
     optimizer: {
       enabled: false,
       runs: 200
     },
     evmVersion: "byzantium"
    // }
  }
}
}