Using Hardhat
What is Hardhat
Hardhat is a development environment designed to allow the user to compile, deploy, test, and debug smart contracts.
Setting up the development environment
There are a few technical requirements before we start. Please install the following: Requirements:
Installing
There are a few technical requirements before we start. Please install the following: Requirements:
- Windows, Linux or Mac OS X
- Node.js v8.9.4 LTS or later
- Git
Firstly, you will need to create an empty project npm init --yes
When your project is ready, can then run
npm install --save-dev hardhat
It’s recommeded to install some dependencies.
npm install --save-dev @nomiclabs/hardhat-waffle ethereum-waffle chai @nomiclabs/hardhat-ethers ethers
Your local installation of Hardhat will require you to use npx
to run it (i.e. npx hardhat
).
Create A Project
Now to create your Hardhat project, run npx hardhat in your project folder:
mkdir MegaCoin
cd MegaCoin
- Intialize your project:
$ npx hardhat
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Welcome to Hardhat v2.0.8
? What do you want to do? …
❯ Create a sample project
Create an empty hardhat.config.js
Quit
Now that the project is initialized, you will now have a project structure with the following items:
- contracts/: Directory for Solidity contracts
- scripts/: Directory for scriptable deployment files
- test/: Directory for test files for testing your application and contracts
- hardhat-config.js: Hardhat configuration file
Create Contract
You can write your own smart contract or download the PRC20 token smart contract template.
Config Hardhat for TC
- Go to hardhat.config.js
- Update the config with nc-network-crendentials.
require("@nomiclabs/hardhat-waffle");
require('@nomiclabs/hardhat-ethers');
const { mnemonic } = require('./secrets.json');
// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task("accounts", "Prints the list of accounts", async () => {
const accounts = await ethers.getSigners();
for (const account of accounts) {
console.log(account.address);
}
});
// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more
/**
* @type import('hardhat/config').HardhatUserConfig
*/
module.exports = {
defaultNetwork: "mainnet",
networks: {
localhost: {
url: "http://127.0.0.1:8545"
},
hardhat: {
},
testnet: {
url: "https://testnet-rpc.brisescan.com",
chainId: 97,
gasPrice: 20000000000,
accounts: {mnemonic: mnemonic}
},
mainnet: {
url: "https://nc-dataseed.brisescan.com/",
chainId: 56,
gasPrice: 20000000000,
accounts: {mnemonic: mnemonic}
}
},
solidity: {
version: "0.5.16",
settings: {
optimizer: {
enabled: true
}
}
},
paths: {
sources: "./contracts",
tests: "./test",
cache: "./cache",
artifacts: "./artifacts"
},
mocha: {
timeout: 20000
}
};
Note
It requires the wallet mnemonic to be passed in for Provider, this is the seed phrase for the account you’d like to deploy from, or example Metamask account. You need to create a new .secret file in root directory and enter your 12 word mnemonic seed phrase to get started. To get the seedwords from metamask wallet you can go to Metamask Settings, then from the menu choose Security and Privacy where you will see a button that says reveal seed words.
Compile Contract
To be able to compile a Hardhat project, change to the root of the directory where the project is located and then type the following into a terminal:
npx hardhat compile
Deploying on PULSE Network
Run this command in root of the project directory:
$ npx hardhat run --network testnet scripts/deploy.js
Remember your address, transaction_hash and other details provided would differ, The above has only been provided to give an idea of structure.
Congratulations! You have now successfully deployed PRC20 Smart Contract. You can interact with the Smart Contract and functions through the explorer.
You can check the deployment status here: