truffle-config.js

const { mnemonic, infuraKey, etherscanApiKey } = require('./.deployment.js')
const HDWalletProvider = require('@truffle/hdwallet-provider')

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      gas: 6712388,
      // gasPrice: 2000000000, // 1 gwei
      network_id: "*"
    },
    docker: {
      host: "host.docker.internal",
      port: 8545,
      gas: 6712388,
      // gasPrice: 2000000000, // 1 gwei
      network_id: "*"
    },
    test: {
      host: "localhost",
      port: 8545,
      network_id: "*",
      gasPrice: 0x01
    },
    coverage: {
      host: "localhost",
      network_id: "*",
      port: 8555,         // <-- If you change this, also set the port option in .solcover.js.
      gas: 0xfffffffffff, // <-- Use this high gas value
      gasPrice: 0x01      // <-- Use this low gas price
    },
    rinkeby: {
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://rinkeby.infura.io/v3/${infuraKey}`, 0, num_addresses),
      gasPrice: 50000000000, // 50 gwei,
      network_id: 4
    },
    ropsten: {
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/${infuraKey}`, 0, num_addresses),
      gasPrice: 50000000000, // 50 gwei,
      network_id: 3
    },
    kovan: {
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://kovan.infura.io/v3/${infuraKey}`, 0, num_addresses),
      gasPrice: 10000000000, // 10 gwei,
      network_id: 42
    },
    xdai: {
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://dai.poa.network`, 0, num_addresses),
      gasPrice: 0x01, // <-- Use this low gas price
      network_id: 100
    },
    polygon: {
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://rpc-mainnet.maticvigil.com/v1/${infuraKey}`, 0, num_addresses),
      gasPrice: 1000000000, // 1 gwei
      network_id: 137
    },
    mumbai:{
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://rpc-mumbai.maticvigil.com/v1/${infuraKey}`, 0, num_addresses),
      gasPrice: 1000000000, // 1 gwei
      network_id: 80001
    },
    mainnet: {
      // gas: 5000000,
      provider: (num_addresses = 1) => new HDWalletProvider(mnemonic, `https://mainnet.infura.io/v3/${infuraKey}`, 0, num_addresses),
      gasPrice: 1000000000, // 1 gwei
      port: 8545,
      network_id: 1,
      confirmations: 20,
    }
  },

  plugins: [
    'truffle-plugin-verify'
  ],
  api_keys: {
    etherscan: etherscanApiKey
  },

  mocha: {
    reporter: 'eth-gas-reporter',
    reporterOptions : {
      currency: 'USD',
      gasPrice: 1
    },
    timeout: 300000,
  },

  compilers: {
    solc: {
      version: "0.5.11",
      settings: {
        optimizer: {
          enabled: true
        },
        evmVersion: 'petersburg' // Important, see https://github.com/trufflesuite/truffle/issues/2416
      }
    }
  }
}