truffle-config.js

require('dotenv').config()
const { TruffleProvider } = require('@harmony-js/core')

module.exports = {
  networks: {
    testnet: {
      network_id: '2',
      provider: () => {
        const truffleProvider = new TruffleProvider(
          process.env.TESTNET_URL,
          { },
          { shardID: 0, chainId: 2 },
          { gasLimit: process.env.GAS_LIMIT, gasPrice: process.env.GAS_PRICE},
        );
        const newAcc = truffleProvider.addByPrivateKey(process.env.TESTNET_PRIVATE_KEY);
        truffleProvider.setSigner(newAcc);
        return truffleProvider;
      },
    },
    mainnet: {
      network_id: '1',
      provider: () => {
        const truffleProvider = new TruffleProvider(
          process.env.MAINNET_URL,
          { },
          { shardID: 0, chainId: 1 },
          { gasLimit: process.env.GAS_LIMIT, gasPrice: process.env.GAS_PRICE },
        );
        const newAcc = truffleProvider.addByPrivateKey(process.env.MAINNET_PRIVATE_KEY);
        truffleProvider.setSigner(newAcc);
        return truffleProvider;
      },
    }
  },

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

  // Configure your compilers
  compilers: {
    solc: {
      // version: "0.6.0",    // 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"
      // }
    },
  },
};