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Getting Started

Quickly add ABIType to your TypeScript project

This section will help you start using ABIType in your TypeScript project. You can also try ABIType online in a TypeScript Playground.

Install

pnpm add abitype

Usage

Since ABIs can contain deeply nested arrays and objects, you must either assert ABIs to constants using const assertions or use the built-in narrow function (works with JavaScript). This allows TypeScript to take the most specific type for expressions and avoid type widening (e.g. no going from "hello" to string).

const erc20Abi = [...] as const
const erc20Abi = <const>[...]
import { narrow } from 'abitype'
const erc20Abi = narrow([...])

Once your ABIs are set up correctly, you can use the exported types and utilities to work with them. You can also import already set-up ABIs from the abitype/abis entrypoint to get started quickly.

import { 
type ExtractAbiFunctionNames<abi extends Abi, abiStateMutability extends AbiStateMutability = AbiStateMutability> = Extract<abi[number], {
  type: "function";
  stateMutability: abiStateMutability;
}>["name"]
Extracts all AbiFunction names from Abi.
ExtractAbiFunctionNames } from 'abitype'
import { 
const erc20Abi: readonly [{
  readonly type: "event";
  readonly name: "Approval";
  readonly inputs: readonly [{
    readonly indexed: true;
    readonly name: "owner";
    readonly type: "address";
  }, {
    readonly indexed: true;
    readonly name: "spender";
    readonly type: "address";
  }, {
    readonly indexed: false;
    readonly name: "value";
    readonly type: "uint256";
  }];
}, ... 9 more ..., {
  ...;
}]
ERC-20 Token Standard
erc20Abi } from 'abitype/abis'
 
type 
type Result = "symbol" | "name" | "allowance" | "balanceOf" | "decimals" | "totalSupply"
Result = 
type ExtractAbiFunctionNames<abi extends Abi, abiStateMutability extends AbiStateMutability = AbiStateMutability> = Extract<abi[number], {
  type: "function";
  stateMutability: abiStateMutability;
}>["name"]
Extracts all AbiFunction names from Abi.
ExtractAbiFunctionNames<typeof 
const erc20Abi: readonly [{
  readonly type: "event";
  readonly name: "Approval";
  readonly inputs: readonly [{
    readonly indexed: true;
    readonly name: "owner";
    readonly type: "address";
  }, {
    readonly indexed: true;
    readonly name: "spender";
    readonly type: "address";
  }, {
    readonly indexed: false;
    readonly name: "value";
    readonly type: "uint256";
  }];
}, ... 9 more ..., {
  ...;
}]
ERC-20 Token Standard
erc20Abi, 'view'>

What's next?

After setting up your project with ABIType, you are ready to dive in further! Here are some places to start: