How can I fix hardhat deploy Error `no matching function` for `deployed()`?

Question

When I use Hardhat to deploy the contract in Sepolia, I keep getting the following error:

My deploy script:

const { ethers } = require("hardhat");

async function main() {
  const whitelistContract = await ethers.getContractFactory("Whitelist");
  const deployedWhitelistContract = await whitelistContract.deploy(10);
  await deployedWhitelistContract.deployed();
  console.log("Whitelist Contract Address:", deployedWhitelistContract.address);
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

My hardhat-config file:

require("@nomicfoundation/hardhat-toolbox");
require("dotenv").config({ path: ".env" });

const QUICKNODE_HTTP_URL = process.env.QUICKNODE_HTTP_URL;
const PRIVATE_KEY = process.env.PRIVATE_KEY;

module.exports = {
  solidity: "0.8.10",
  networks: {
    hardhat: {},
    sepolia: {
      url: QUICKNODE_HTTP_URL,
      accounts: [`0x${PRIVATE_KEY}`],
   },
  },
};

Answer 1

The error message shows, .deployed() does not exist. so use waitForDeployment() instead .deployed().

and also use .target or await deployedWhitelistContract.getAddress() instead of .address

RIGHT CODE:

const { ethers } = require("hardhat");

async function main() {
  const whitelistContract = await ethers.getContractFactory("Whitelist");
  const deployedWhitelistContract = await whitelistContract.deploy(10);
  await deployedWhitelistContract.waitForDeployment();
  console.log("Whitelist Contract Address:", await deployedWhitelistContract.getAddress());
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

Answer 2

Remove 0x from the private key. Just pass the private key like this

accounts: [process.env.PRIVATE_KEY]

Answer 3

Hardhat-tools changed the deployment's function syntax. For hardhat-tools 3.0.0 deploy() is now deployContract() and deployed() is now awaitForDeployment()

You can either downgrade your hardhat-tools version or use the new syntax.