#Deploying your contracts

To deploy your contracts, you can use Hardhat Ignition, our declarative deployment system. You can deploy the Lock contract from the sample project by using its accompanying Ignition module. An Ignition module is a TypeScript or JavaScript file that allows you to specify what needs to be deployed.

In the sample project, the Ignition module LockModule which deploys the Lock contract, is under the ./ignition/modules directory and looks like this:

import { buildModule } from "@nomicfoundation/hardhat-ignition/modules";

const JAN_1ST_2030 = 1893456000;
const ONE_GWEI: bigint = 1_000_000_000n;

const LockModule = buildModule("LockModule", (m) => {
  const unlockTime = m.getParameter("unlockTime", JAN_1ST_2030);
  const lockedAmount = m.getParameter("lockedAmount", ONE_GWEI);

  const lock = m.contract("Lock", [unlockTime], {
    value: lockedAmount,
  });

  return { lock };
});

export default LockModule;

const { buildModule } = require("@nomicfoundation/hardhat-ignition/modules");

const JAN_1ST_2030 = 1893456000;
const ONE_GWEI = 1_000_000_000n;

module.exports = buildModule("LockModule", (m) => {
  const unlockTime = m.getParameter("unlockTime", JAN_1ST_2030);
  const lockedAmount = m.getParameter("lockedAmount", ONE_GWEI);

  const lock = m.contract("Lock", [unlockTime], {
    value: lockedAmount,
  });

  return { lock };
});

You can deploy in the localhost network following these steps:

1. Start a local node

   npx hardhat node
   

2. Open a new terminal and deploy the Hardhat Ignition module in the localhost network

   TypeScript

   JavaScript

   npx hardhat ignition deploy ./ignition/modules/Lock.ts --network localhost
   

   npx hardhat ignition deploy ./ignition/modules/Lock.js --network localhost
   

As general rule, you can target any network from your Hardhat config using:

npx hardhat ignition deploy ./ignition/modules/Lock.js --network <your-network>

If no network is specified, Hardhat Ignition will run against an in-memory instance of Hardhat Network.

In the sample LockModule above, two module parameters are used: unlockTime which will default to the 1st of Jan 2030 and lockedAmount which will default to one Gwei. You can learn more about overriding these values by providing your own module parameters during deployment in our Deploying a module guide.

Read more about Hardhat Ignition generally in the Hardhat Ignition documentation.