@nomicfoundation/ethereumjs-statemanager

@ethereumjs/statemanager

TypeScript implementation of the Ethereum StateManager.

Installation

To obtain the latest version, simply require the project using npm:

npm install @ethereumjs/statemanager

Note: this library was part of the @ethereumjs/vm package up till VM v5.

Usage

Introduction

The StateManager provides high-level access and manipulation methods to and for the Ethereum state, thinking in terms of accounts or contract code rather then the storage operations of the underlying data structure (e.g. a Trie).

The library includes a TypeScript interface StateManager to ensure a unified interface (e.g. when passed to the VM) as well as a concrete Trie-based implementation DefaultStateManager.

Example

import { Account, Address } from '@ethereumjs/util'
import { DefaultStateManager } from '@ethereumjs/statemanager'

const stateManager = new DefaultStateManager()
const address = new Address(Buffer.from('a94f5374fce5edbc8e2a8697c15331677e6ebf0b', 'hex'))
const account = new Account(BigInt(0), BigInt(1000))
await stateManager.checkpoint()
await stateManager.putAccount(address, account)
await stateManager.commit()
await stateManager.flush()

API

Docs

Generated TypeDoc API Documentation

BigInt Support

Starting with v1 the usage of BN.js for big numbers has been removed from the library and replaced with the usage of the native JS BigInt data type (introduced in ES2020).

Please note that number-related API signatures have changed along with this version update and the minimal build target has been updated to ES2020.

Development

Developer documentation - currently mainly with information on testing and debugging - can be found here.

EthereumJS

See our organizational documentation for an introduction to EthereumJS as well as information on current standards and best practices. If you want to join for work or carry out improvements on the libraries, please review our contribution guidelines first.

License

MPL-2.0