While building out your applications, you may require a reference to certain static values that don't change. For example, the EntryPoint contract or various account factories. The Constants module provides a quick way to access these values.

View the source code on GitHub.

import { Constants } from "userop";

ERC4337

A collection of values related to the core ERC-4337 protocol.

EntryPoint

The address to the canonical EntryPoint contract.

Constants.ERC4337.EntryPoint

SimpleAccount factory

The address to the factory contract used to deploy the sample SimpleAccount.sol.

Constants.ERC4337.SimpleAccount.Factory

Kernel

A collection of values related to the ZeroDev Kernel contract account framework.

Factory

The address to the factory used to deploy a Kernel account. This is the factory to use if you need to deploy a Kernel account with a custom default validator.

Constants.Kernel.factory

ECDSA factory

The address to the factory used to deploy a Kernel account with an ECDSA validator as the default. This is equivalent to creating an account with the base factory using the ECDSA validator address.

Constants.Kernel.ECDSAFactory

ECDSA validator

The address to the ECDSA validator contract. This is a plugin that allows User Operations sent to a Kernel account to be validated with an ECDSA key pair.

Constants.Kernel.ECDSAValidator

Modes

A Kernel account can be executed under different modes. These are constant values which can be concatenated to the start of the UserOperation signature field.

Constants.Kernel.Modes.Sudo
Constants.Kernel.Modes.Plugin
Constants.Kernel.Modes.Enable

Safe

A collection of values related to the Safe contract ecosystem.

MultiSend

The address to the MultiSend.sol contract which allows batching of multiple transactions. The addresses here are equivalent to v1.3.0 of the safe deployments.

// Addresses are not the same for all networks and requires a lookup by the chainID string.
Constants.Safe.MultiSend[chainID]