index.js

let { Web3 } = require('web3');
let solc = require('solc');
let fs = require('fs');

// Get privatekey from environment
require('dotenv').config();
let privatekey = process.env.PRIVATE_KEY;
if (privatekey.slice(0, 2) !== '0x') privatekey = '0x' + privatekey;

// Load contract
const source = fs.readFileSync('Incrementer.sol', 'utf8');

// compile solidity
const input = {
  language: 'Solidity',
  sources: {
    'Incrementer.sol': {
      content: source,
    },
  },
  settings: {
    outputSelection: {
      '*': {
        '*': ['*'],
      },
    },
  },
};

const compiledCode = JSON.parse(solc.compile(JSON.stringify(input)));
const contractFile = compiledCode.contracts['Incrementer.sol']['Incrementer'];

// Get bin & abi
const bytecode = contractFile.evm.bytecode.object;
const abi = contractFile.abi;

// Create web3 with sepolia provider，you can change sepolia to other testnet
const web3 = new Web3('https://sepolia.infura.io/v3/' + process.env.INFURA_ID);

// Create account from privatekey
const accounts = web3.eth.accounts.wallet.add(privatekey);

/*
   -- Deploy Contract --
*/
const Deploy = async () => {
  // Create contract instance
  const deployContract = new web3.eth.Contract(abi);

  // Create Tx
  const deployTx = deployContract.deploy({
    data: '0x' + bytecode,
    arguments: [0], // Pass arguments to the contract constructor on deployment(_initialNumber in Incremental.sol)
  });

  // optionally, estimate the gas that will be used for development and log it
  const gas = await deployTx.estimateGas({
    from: accounts,
  });
  console.log('estimated gas:', gas);

  try {
    // Deploy the contract to the Ganache network
    // Your deployed contrac can be viewed at: https://sepolia.etherscan.io/address/${tx.options.address}
    // You can change sepolia in above url to your selected testnet.
    const tx = await deployTx.send({
      from: accounts[0].address,
      gas,
      // gasPrice: 10000000000,
    });
    console.log('Contract deployed at address: ' + tx.options.address);
  } catch (error) {
    console.error(error);
  }
};

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
Deploy()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });