@ngeth/hardhat

@ngeth/hardhat

@ngeth/hardhat helps you setup hardhat for an angular project and generates typescript classes that you can use for your angular services.

Install

ng add @ngeth/hardhat

The command above might be very slow for some reason. Use this to go faster

npm install @ngeth/hardhat
ng generate @ngeth/hardhat:ng-add

Openzeppelin

@ngeth/hardhat doesn't comes with openzeppelin by default. You can install it by doing :

npm install @openzeppelin/contracts

How to use

1. Under contracts/: Add your solidity contracts.
2. Under hardhat.config.ts: Add the contracts you want to auto deploy under ngeth.autoDeploy.
3. Run ng hardhat-serve.
4. Under src/app/contracts: See the generated contracts and addresses.
5. Create a service :

import { Injectable } from '@angular/core';
import { ERC20Contract, addresses } from './contracts';
import { MetaMask } from '@ngeth/ethers';

@Injectable({ providedIn: 'root' })
export class ERC20 extends ERC20Contract {
  constructor(metamask: MetaMask) {
    super(addresses.ERC20, metamask.getSigner());
  }
}

For more details see @ngeth/ethers.

Tasks / Builder

@ngeth/hardhat comes with 3 custom hardhat tasks. If you use ng add, the schematics will creates builders inside your workspace that wrap these tasks:

hardhat ngeth:build (@ngeth/hardhat:build):

• compiles the contracts
• generates the contract classes

hardhat ngeth:serve (@ngeth/hardhat:serve):

• compiles the contracts.
• generates the contract classes.
• runs a node on localhost.
• deploys the contracts under ngeth.autoDeploy in hardhat.config.ts.

hardhat ngeth:test (@ngeth/hardhat:test):

• compiles the contracts.
• tests with jest.

If you want to test with mocha, use the regular hardhat test task.

Troubleshoot

Invalid chainId

This is an issue with metamask and hardhat https://hardhat.org/metamask-issue.html

Invalid nonce

This is an issue with metamask not beeing able to reset the nonce to 0 when you restart the node Go to Metamask > Setting > Advanced > Reset Account