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Strict TypeScript types for Ethereum ABIs. ABIType provides utilities and type definitions for ABI properties and values, covering the Contract ABI Specification, as well as EIP-712 Typed Data.

import { ExtractAbiFunctions } from 'abitype'
import { erc20Abi } from 'abitype/test'

type FunctionNames = ExtractAbiFunctionNames<typeof erc20Abi, 'view'>
//   ^? type FunctionNames = "symbol" | "name" | "allowance" | "balanceOf" | "decimals" | "totalSupply"

type TransferInputTypes = AbiParametersToPrimitiveTypes<
  // ^? type TransferInputTypes = readonly [`0x${string}`, bigint]
  ExtractAbiFunction<typeof erc20Abi, 'transfer'>['inputs']
>

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

TL;DR

ABIType might be a good option for your project if:

• You want to typecheck your ABIs or EIP-712 Typed Data.
• You want to add type inference and autocomplete to your library based on user-provided ABIs or EIP-712 Typed Data, like wagmi and viem.
• You need to convert ABI types (e.g. 'string') to TypeScript types (e.g. string) or other type transformations.
• You need to validate ABIs at runtime (e.g. after fetching from external resource).
• You don’t want to set up a build process to generate types (e.g. TypeChain).

Install

pnpm add abitype

npm i abitype

yarn add abitype

Documentation

For full documentation, visit abitype.dev.

Community

If you have questions or need help, reach out to the community at the ABIType GitHub Discussions.

Sponsor

If you find ABIType useful, please consider supporting development on GitHub Sponsors or sending crypto to wagmi-dev.eth. Thank you 🙏

Contributing

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