abitype

What is abitype?

The abitype npm package is designed to provide TypeScript types for Ethereum ABI (Application Binary Interface) definitions. It helps developers to work with Ethereum smart contracts in a type-safe manner, ensuring that the interactions with the contracts are correctly typed and reducing the risk of runtime errors.

What are abitype's main functionalities?

Define ABI Types

This feature allows you to define the ABI of a smart contract in a type-safe manner. The `Abi` type ensures that the structure of the ABI is correct and helps catch errors at compile time.

import { Abi } from 'abitype';

const myAbi: Abi = [
  {
    "constant": true,
    "inputs": [],
    "name": "myFunction",
    "outputs": [
      {
        "name": "",
        "type": "uint256"
      }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  }
];

Type-safe Contract Interactions

This feature allows you to interact with smart contract functions in a type-safe manner. By defining the ABI and using the `AbiFunction` type, you can ensure that the interactions with the contract are correctly typed.

import { Abi, AbiFunction } from 'abitype';

const myAbi: Abi = [
  {
    "constant": true,
    "inputs": [],
    "name": "myFunction",
    "outputs": [
      {
        "name": "",
        "type": "uint256"
      }
    ],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  }
];

const myFunction: AbiFunction = myAbi[0];

// Now you can interact with the function in a type-safe way
const result: number = await myContract.methods.myFunction().call();

Other packages similar to abitype

ethers

The ethers.js library is a complete and compact library for interacting with the Ethereum blockchain. It provides utilities for working with Ethereum smart contracts, including ABI encoding/decoding, but it is more comprehensive and includes features for managing wallets, interacting with the blockchain, and more. Compared to abitype, ethers.js is a more feature-rich library but may be overkill if you only need type-safe ABI definitions.

web3

The web3.js library is another comprehensive library for interacting with the Ethereum blockchain. It provides similar functionalities to ethers.js, including ABI encoding/decoding, contract interactions, and more. Like ethers.js, it is more feature-rich compared to abitype and is suitable for developers who need a full suite of tools for Ethereum development.

README

AbiType

Strict TypeScript types for Ethereum ABIs. AbiType provides utilities and type defintions for ABI properties and values, covering the entire Contract ABI Specification.

import { ExtractAbiFunctions } from 'abitype'

const erc721Abi = [...] as const

type Functions = ExtractAbiFunctions<typeof erc721Abi, 'view'>

Works great for adding blazing fast autocomplete and type checking to functions or variables. No need to generate types with third-party tools – just use your ABI and let TypeScript do the rest!

Installation

npm install abitype

Usage

Since ABIs can contain deeply nested arrays, objects, and other types, you must assert your ABIs to constants using const assertions. This allows TypeScript to take the most specific types for expressions and avoid type widening (e.g. no going from "hello" to string).

const erc721Abi = [...] as const

const erc721Abi = <const>[...]

Utilities

AbiParameterToPrimitiveType

Converts AbiParameter to corresponding TypeScript primitive type.

import { AbiParameterToPrimitiveType } from 'abitype'

type Result = AbiParameterToPrimitiveType<{
  name: 'owner'
  type: 'address'
}>

AbiParametersToPrimitiveTypes

Converts array of AbiParameter to corresponding TypeScript primitive type.

import { AbiParametersToPrimitiveTypes } from 'abitype'

type Result = AbiParametersToPrimitiveTypes<
  [
    {
      name: 'to'
      type: 'address'
    },
    {
      name: 'tokenId'
      type: 'uint256'
    },
  ]
>

AbiTypeToPrimitiveType

Converts AbiType to corresponding TypeScript primitive type.

import { AbiParametersToPrimitiveTypes } from 'abitype'

type Result = AbiTypeToPrimitiveType<'address'>

Note Does not include full array or tuple conversion. Use AbiParameterToPrimitiveType to fully convert arrays and tuples.

ExtractAbiError

Extracts all AbiError types from Abi

import { ExtractAbiError } from 'abitype'

type Result = ExtractAbiError<typeof erc721Abi, 'SomeError'>

ExtractAbiErrorNames

Extracts all AbiError names from Abi

import { ExtractAbiErrorNames } from 'abitype'

type Result = ExtractAbiErrorNames<typeof erc721Abi>

ExtractAbiErrors

Extracts all AbiError types from Abi

import { ExtractAbiErrors } from 'abitype'

type Result = ExtractAbiErrors<typeof erc721Abi>

ExtractAbiEvent

Extracts AbiEvent with name from Abi

import { ExtractAbiEvent } from 'abitype'

type Result = ExtractAbiEvent<typeof erc721Abi, 'Transfer'>

ExtractAbiEventNames

Extracts all AbiEvent names from Abi

import { ExtractAbiEventNames } from 'abitype'

type Result = ExtractAbiEventNames<typeof erc721Abi>

ExtractAbiEvents

Extracts all AbiEvent types from Abi

import { ExtractAbiEvents } from 'abitype'

type Result = ExtractAbiEvents<typeof erc721Abi>

ExtractAbiFunction

Extracts AbiFunction with name from Abi

import { AbiFunction } from 'abitype'

type Result = ExtractAbiFunction<typeof erc721Abi, 'balanceOf'>

ExtractAbiFunctionNames

Extracts all AbiFunction names from Abi

import { ExtractAbiFunctionNames } from 'abitype'

type Result = ExtractAbiFunctionNames<typeof erc721Abi>

ExtractAbiFunctions

Extracts all AbiFunction types from Abi

import { ExtractAbiFunctions } from 'abitype'

type Result = ExtractAbiFunctions<typeof erc721Abi>

By default, extracts all functions, but you can also filter by AbiStateMutability:

type Result = ExtractAbiFunctions<typeof erc721Abi, 'view'>

IsAbi

Checks if type is Abi

import { IsAbi } from 'abitype'

type Result = IsAbi<typeof erc721Abi>

Types

Abi

Type matching the Contract ABI Specification

import { Abi } from 'abitype'

AbiError

ABI Error type

import { AbiError } from 'abitype'

AbiEvent

ABI Event type

import { AbiEvent } from 'abitype'

AbiFunction

ABI Function type

import { AbiFunction } from 'abitype'

AbiInternalType

Representation used by Solidity compiler (e.g. 'string', 'int256', 'struct Foo')

import { AbiInternalType } from 'abitype'

AbiParameter

inputs and ouputs item for ABI functions, events, and errors

import { AbiParameter } from 'abitype'

AbiParameterType

Type of ABI parameter: 'inputs' | 'outputs'

import { AbiParameterType } from 'abitype'

AbiStateMutability

ABI Function behavior

import { AbiStateMutability } from 'abitype'

AbiType

ABI canonical types

import { AbiType } from 'abitype'

Support

If you find AbiType useful, please consider supporting development. Thank you 🙏

• GitHub Sponsors
• Gitcoin Grant
• wagmi-dev.eth

Contributing

If you're interested in contributing, please read the contributing docs before submitting a pull request.

Authors

• awkweb.eth (@awkweb) – Mirror

Thanks

• indreams.eth (@strollinghome) for answering Solidity questions!

License

WAGMIT License