Installation

yarn add @layerzerolabs/toolbox-hardhat

pnpm add @layerzerolabs/toolbox-hardhat

npm install @layerzerolabs/toolbox-hardhat

Configuration

1. Add @layerzerolabs/toolbox-hardhat to your config

To use @layerzerolabs/toolbox-hardhat you will need to import it in your hardhat config file.

TypeScript (hardhat.config.ts)

import "@layerzerolabs/toolbox-hardhat";

JavaScript (hardhat.config.js)

require("@layerzerolabs/toolbox-hardhat");

2. Connect your networks

LayerZero deploys EndpointV2 contracts on all supported chains. These contracts are identified by their endpoint ID (eid for short).

In order to wire your contracts, @layerzerolabs/toolbox-hardhat needs to know the mapping between the networks defined in your hardhat config and the endpoint ID.

Previously we required your network names to exactly match the names we use. In order to be more flexible, we decided to switch this more explicit, albeit more verbose configuration.

Head to your hardhat config to set the eid ↔︎ network mapping.

TypeScript (hardhat.config.ts)

import { HardhatUserConfig } from "hardhat/types";
import { EndpointId } from "@layerzerolabs/lz-definitions";

const config: HardhatUserConfig = {
  // ...
  networks: {
    fuji: {
      eid: EndpointId.AVALANCHE_V2_TESTNET,
      url: "https://api.avax-test.network/ext/bc/C/rpc",
      // ...
    },
    mainnet: {
      eid: EndpointId.ETHEREUM_V2_MAINNET,
      url: "https://eth.llamarpc.com",
    },
  },
};

export default config;

JavaScript (hardhat.config.js)

const { EndpointId } = require("@layerzerolabs/lz-definitions");

const config = {
  // ...
  networks: {
    fuji: {
      eid: EndpointId.AVALANCHE_V2_TESTNET,
      url: "https://api.avax-test.network/ext/bc/C/rpc",
      // ...
    },
    mainnet: {
      eid: EndpointId.ETHEREUM_V2_MAINNET,
      url: "https://eth.llamarpc.com",
    },
  },
};

module.exports = config;

3. Configure your LayerZero OApp Config

To use the lz:oapp:wire task you must first fill out your layerzero.config file.

LayerZero configuration:

• contracts: A conditionally required array of LayerZero Contracts.

  • contract: A LayerZero Contract, defines the eid along with either the contractName or the address.
    • eid: A number, defines the LayerZero Endpoint Identifier.
    • contractName: The contract name. An optional parameter. It should be provided only if the contract was deployed using hardhat-deploy and the deployment information is located in the deployments folder.
    • address: The contract address. An optional parameter. It should be provided if the contracts are not located in the deployments folder.

• connections: A conditionally required array of LayerZero Connections defining the configuration between two LayerZero contracts.

  • from: A LayerZero Contract, defines the from contract. This sets the peer from -> to.
  • to: A LayerZero Contract, defines the to contract. This sets the peer from -> to.
    • Note: Both from and to are optional; you are not required to connect all pathways. However, from and to must be defined to set config.
  • config: An optional LayerZero Config, defines a configuration between two contracts.
    • sendLibrary: An optional string, defines the Send Library Address.
    • receiveLibraryConfig: An optional LayerZero Receive Library Config, defines the receiveLibrary and gracePeriod.
      • receiveLibrary: A string, defines the Receive Library Address.
      • gracePeriod: A number, defines Grace Period.
    • receiveLibraryTimeoutConfig: An optional LayerZero Receive Library Timeout Config, defines the lib and expiry.
      • lib: A string, defines the Receive Library Address.
      • expiry: A number, defines the block timestamp the Receive Library will expire.
    • sendConfig: An optional LayerZero Send Config, defines the executorConfig and ulnConfig.
      • executorConfig: A LayerZero Executor Config, defines the maxMessageSize and executor.
        • maxMessageSize: A number, defines the maxMessageSize.
        • executor: A string, defines the Executor Address.
      • ulnConfig: An optional LayerZero ULN Config Object, defines the confirmations, optionalDVNThreshold, requiredDVNs, and optionalDVNs.
        • confirmations: A number, defines the Block Confirmations.
        • optionalDVNThreshold: A number, defines the Optional DVN Threshold.
        • requiredDVNs: An array of strings, defines the Required DVNs.
        • optionalDVNs: An array of strings, defines the Optional DVNs.
    • receiveConfig: An optional LayerZero Receive Config, defines the ulnConfig.
      • ulnConfig: A LayerZero ULN Config Object, defines the confirmations, optionalDVNThreshold, requiredDVNs, and optionalDVNs.
        • confirmations: A number, defines the Block Confirmations.
        • optionalDVNThreshold: A number, defines the Optional DVN Threshold.
        • requiredDVNs: A array of strings, defines the Required DVNs.
        • optionalDVNs: A array of strings, defines the Optional DVNs.
    • enforcedOptions: An optional array of LayerZero Enforced Options, defines the msgType and optionType.
      • msgType: A number, defines a user defined msgType for the OApp
      • optionType: A number, defines type of Enforced Option.
        • LZ_RECEIVE: Enforced option type 1
          • gas: A number, defines gas for Option Type LZ_RECEIVE.
          • value: A number, defines value for Option Type LZ_RECEIVE.
        • NATIVE_DROP: Enforced option type 2
          • amount: A number, defines amount for Option Type NATIVE_DROP.
          • receiver: A string, defines the receiver address for Option Type NATIVE_DROP.
        • COMPOSE: Enforced option type 3
          • index: A number, defines the index of the composable calls for Option Type COMPOSE.
          • gas: A number, defines gas for the composable calls for Option Type COMPOSE.
          • value: A number, defines value for the composable calls for Option Type COMPOSE.
        • ORDERED: Enforced option type 4

For example:

TypeScript (layerzero.config.ts)

import {
  OAppOmniGraphHardhat,
  OmniPointHardhat,
} from "@layerzerolabs/ua-devtools-evm-hardhat";
import { EndpointId } from "@layerzerolabs/lz-definitions";
import { ExecutorOptionType } from "@layerzerolabs/lz-v2-utilities";

const sepoliaContract: OmniPointHardhat = {
  eid: EndpointId.SEPOLIA_V2_TESTNET,
  contractName: "MyOApp",
};

const fujiContract: OmniPointHardhat = {
  eid: EndpointId.AVALANCHE_V2_TESTNET,
  contractName: "MyOApp",
};

const graph: OAppOmniGraphHardhat = {
  contracts: [
    {
      contract: fujiContract,
    },
    {
      contract: sepoliaContract,
    },
  ],
  connections: [
    {
      // Sets the peer `from -> to`. Optional, you do not have to connect all pathways.
      from: fujiContract,
      to: sepoliaContract,
      // Optional Configuration
      config: {
        // Optional Send Library
        sendLibrary: "0x0000000000000000000000000000000000000000",
        // Optional Receive Library Configuration
        receiveLibraryConfig: {
          receiveLibrary: "0x0000000000000000000000000000000000000000",
          gracePeriod: BigInt(0),
        },
        // Optional Receive Library Timeout Configuration
        receiveLibraryTimeoutConfig: {
          lib: "0x0000000000000000000000000000000000000000",
          expiry: BigInt(0),
        },
        // Optional Send Configuration
        sendConfig: {
          executorConfig: {
            maxMessageSize: 99,
            executor: "0x0000000000000000000000000000000000000000",
          },
          ulnConfig: {
            confirmations: BigInt(42),
            requiredDVNs: [],
            optionalDVNs: [
              "0x0000000000000000000000000000000000000000",
              "0x0000000000000000000000000000000000000000",
            ],
            optionalDVNThreshold: 2,
          },
        },
        // Optional Receive Configuration
        receiveConfig: {
          ulnConfig: {
            confirmations: BigInt(42),
            requiredDVNs: [],
            optionalDVNs: [
              "0x0000000000000000000000000000000000000000",
              "0x0000000000000000000000000000000000000000",
            ],
            optionalDVNThreshold: 2,
          },
        },
        // Optional Enforced Options Configuration
        enforcedOptions: [
          {
            msgType: 1,
            optionType: ExecutorOptionType.LZ_RECEIVE,
            gas: 200000,
            value: 1,
          },
          {
            msgType: 1,
            optionType: ExecutorOptionType.NATIVE_DROP,
            amount: 1,
            receiver: "0x0000000000000000000000000000000000000000",
          },
          {
            msgType: 2,
            optionType: ExecutorOptionType.COMPOSE,
            index: 0,
            gas: 200000,
            value: 1,
          },
          {
            msgType: 2,
            optionType: ExecutorOptionType.COMPOSE,
            index: 1,
            gas: 300000,
            value: 1,
          },
        ],
      },
    },
  ],
};
export default graph;

Usage

Tasks

This package comes with several hardhat tasks to speed up your workflow. In order to prevent name collisions, these have been prefixed with lz::

• lz:oapp:wire

lz:oapp:wire

Wires the individual OApp contracts together, calling setPeer.

pnpm hardhat lz:oapp:wire