@vechain/hardhat-ethers NPM

hardhat-vechain

A package extending Hardhat Ethers to use a Connex provider.

Usage

Modify hardhat.config.js to require @vechain/hardhat-vechain and @vechain/hardhat-ethers.
Configure networks to include a vechain configuration
Note: A solo Thor instance should be running for the below configurations to work

Sample `hardhat.config.js`

const {
  VECHAIN_URL_SOLO
} = require("@vechain/hardhat-vechain");
require("@vechain/hardhat-ethers");

module.exports = {
    solidity: {
        version: "0.8.17",
    },
    networks: {
        vechain: {
            url: VECHAIN_URL_SOLO
        },
    }
};

Sample `hardhat.config.js` with fee delegation

Fee delegation can be configured by providing optional delegate config which has required url and optional signer field. Url needs to point to delegation a valid delegation service, for example https://sponsor-testnet.vechain.energy/by/${projectId}.

const {
  VECHAIN_URL_SOLO
} = require("@vechain/hardhat-vechain");
require("@vechain/hardhat-web3");

module.exports = {
    solidity: {
        version: "0.8.17",
    },
    networks: {
        vechain: {
            url: VECHAIN_URL_SOLO,
            delegate: {
                url: "${feeDelegationServiceUrl}",
                signer: "${optionalSigner}"
            }
        },
    }
};

Multi network support sample `hardhat.config.js`

Multiple network can also be configured to simplify testing and deployments. Networks which are targeting VechainThor nodes should have vechain as part of the network name (vechain, vechain_testnet, vechainNode are all valid). Network names without this requirement won't be preprocessed by the plugin and it is not expected to function properly with Thor network. Sample configuration:

const {
  VECHAIN_URL_SOLO
} = require("@vechain/hardhat-vechain");
require("@vechain/hardhat-web3");

module.exports = {
    solidity: {
        version: "0.8.17",
    },
    networks: {
        vechain_solo: {
            url: VECHAIN_URL_SOLO,
            delegate: {
                url: "${feeDelegationServiceUrl}",
                signer: "${optionalSigner}"
            }
        },
        vechain_mainnet: {
            url: "https://mainnet.veblocks.net",
        },
    }
};

Clauses support

Vechain Thor network supports sending multiple clauses as part of one transaction. Clauses are then executed atomically on a chain. Hardhat plugin supports Vechain tx construction with multiple clauses. Example code:

const clauseBuilder = new ClausesBuilder(baseContract);
const tx = await clauseBuilder.withClause({
    args: [1],
    abi: JSON.stringify([{ type: 'function', name: 'method1'}] ),
    method: 'method1'
}).withClause({
    args: [2],
    abi: JSON.stringify([{ type: 'function', name: 'method2'}] ),
    method: 'method2'
}).send()

Where baseContract is an instance of a deployed contract.

Testing

Use Hardhat Ethers as usual

describe("vechain-ethers", function() {
    it("should be able to get signers", async function () {
        const accounts = await ethers.getSigners();
        assert.equals(accounts[0], "0xf077b491b355e64048ce21e3a6fc4751eeea77fa");
    });
});