truffle-config.js

const path = require("path");
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: 8545
    // }
    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8498,           // Standard Ethereum port (default: none)
      network_id: "*",       // Any network (default: none)
    },
    matic: {
      provider: function() {
        return new HDWalletProvider("gesture rather obey video awake genuine patient base soon parrot upset lounge", 'https://testnetv3.matic.network', 0,1)
      },
      network_id: 15001,
      gas: 8000000,
      gasPrice: 0,
    },

    rinkeby: {
      provider: () => new HDWalletProvider(process.env.MNEMONIC, `https://rinkeby.infura.io/v3/${process.env.INFURA_API}`),
      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 )
    },
  },

  // HTTP://127.0.0.1:7699


  compilers: {
    solc: {
      version: "0.6.1",    // 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"
      // }
    }
  }
};