truffle.js

const HDWalletProvider = require('@truffle/hdwallet-provider')

const defaultConfig = {
  network_id: '*',
  gas: 5500000,
  gasPrice: 4000000000, // gwei
  websockets: true,
}

module.exports = {
  compilers: {
    solc: {
      version: "0.7.6",
    },
  },
  networks: {
    infura: {
      provider: () => {
        return new HDWalletProvider(
          process.env.MNEMONIC,
          `https://${process.env.INFURA_CHAIN}.infura.io`
        )
      },
      ...defaultConfig,
    },
    development: {
      host: 'localhost',
      port: 8545,
      ...defaultConfig,
    },
    ganache: {
      host: 'localhost',
      port: 8545,
      ...defaultConfig,
    },
    geth: {
      host: '127.0.0.1',
      port: 8545,
      ...defaultConfig,
    },
    rinkeby: {
      host: '127.0.0.1',
      port: 8545,
      ...defaultConfig,
    },
    parity: {
      host: 'localhost',
      port: 4242,
      ...defaultConfig,
    },
  },
}