Abiwan

Table of Contents

• About
• Getting Started
  • Demo
  • Prerequisites
  • Usage standalone
  • Usage with starknet.js
• Supported Cairo Types
• Contributing
• Acknowledgements

About

Abiwan is an UNLICENSE standalone TypeScript parser for Cairo smart contracts. It enables on the fly typechecking and autocompletion for contract calls directly in TypeScript. Developers can now catch typing mistakes early, prior to executing the call on-chain, and thus enhancing the overall Dapp development experience.

Cairo versions

Abiwan will support multiple Cairo compiler versions, but not in parallel - different package versions will support different Cairo versions.

Abiwan	Cairo compiler
1.0.3	Cairo v1.0.0 Cairo v1.1.0
2.1.1	Cairo v2.3.0
2.2.0	Cairo v2.4.4

Getting Started

Demo

abiwan-demo.mp4

Prerequisites

Abiwan dependence only on typescript version 4.9.5 or higher. Also, it makes use of BigInt, so the tsconfig.json should target at least ES2020:

// tsconfig.json
{
  "compilerOptions": {
    "target": "ES2020",
    "lib": ["ES2020", "ESNext"]
  }
}

Usage standalone

To use Abiwan, you must first export your ABI as const in a typescript file

export const ABI = [
  //Your ABI here
] as const;

If you have a json file containing your contract class, you can use the CLI to generate the typescript file for you:

npx abi-wan-kanabi --input /path/to/contract_class.json --output /path/to/abi.ts

You can then import it in any script and you are set to go:

import ABI from "./path/to/abi";
import { call } from "abi-wan-kanabi";
// You'll notice the editor is able to infer the types of the contract's functions
// It'll give you autocompletion and typechecking
const balance = call(ABI, "your_function_name", ["your", "function", "args"]);

If you think that we should be able to import the ABI directly from the json files, we think so too! See this typescript issue and thumb it up!

Usage with starknet.js

Let's say you want to interact with the Ekubo: Core contract using starknet.js

You need to first get the ABI of the contract and export it in a typescript file, you can do so using one command combining both starkli (tested with version 0.2.3) and npx abi-wan-kanabi, the command will also print a helpful snippet that you can use to get started

starkli class-at "0x00000005dd3d2f4429af886cd1a3b08289dbcea99a294197e9eb43b0e0325b4b" --network mainnet | npx abi-wan-kanabi --input /dev/stdin --output abi.ts

import { Contract, RpcProvider, constants } from "starknet";
import { ABI } from "./abi";

async function main() {
  const address =
    "0x00000005dd3d2f4429af886cd1a3b08289dbcea99a294197e9eb43b0e0325b4b";
  const provider = new RpcProvider({ nodeUrl: constants.NetworkName.SN_MAIN });
  const contract = new Contract(ABI, address, provider).typedv2(ABI);

  const version = await contract.getVersion();
  console.log("version", version);

  // Abiwan is now successfully installed, just start writing your contract
  // function calls (`const ret  = contract.your_function()`) and you'll get
  // helpful editor autocompletion, linting errors ...
  const primary_inteface_id = contract.get_primary_interface_id();
  const protocol_fees_collected = contract.get_protocol_fees_collected("0x1");
}
main().catch(console.error);

Configuration

Abiwan's types are customizable using declaration merging. Just extend the Config interface and override the types you want to change, see how starknet.js is doing it here

declare module "abi-wan-kanabi" {
  interface Config {
    FeltType: string;
    IntType: number;
    // ...
  }
}

Check config.ts for all the available options and the their default values.

 Supported Cairo Types

Abiwan supports all of Cairo types, here's the mapping between Cairo types and Typescript types

Primitive Types

Cairo	TypeScript
felt252	string | number | bigint
u8 - u32	number | bigint
u64 - u256	number | bigint | U256
ContractAddress	string
EthAddress	string
ClassHash	string
bytes31	string
ByteArray	string
bool	boolean
()	void

 Complex Types

Cairo	TypeScript
Option<T>	T | undefined
Array<T>	T[]
Span<T>	T[]
tuple (T1, T2, ..., Tn)	[T1, T2, ..., Tn]
struct	an object where keys are struct member names
enum	a union of objects, each enum variant is an object

Struct example

Cairo:

struct TestStruct {
  int128: u128,
  felt: felt252,
  tuple: (u32, u32)
}

Typescript:

{
  int128: number | bigint | Uint256;
  felt: string | number | bigint;
  tuple: [number | bigint, number | bigint];
}

Enum example

Cairo:

enum TestEnum {
  int128: u128,
  felt: felt252,
  tuple: (u32, u32),
}

Typescript:

{ int128: number | bigint | Uint256 } |
{ felt: string | number | bigint } |
{ tuple: [number | bigint, number | bigint]}

Contributing

Run tests

npm run typecheck

Generate test/example.ts

# First build the example project with `scarb`
cd test/example
scarb build
# Then generate test/example.ts
cd ../..
npm run generate -- --input test/example/target/dev/example_example_contract.contract_class.json --output test/example.ts

Contributions on Abiwan are most welcome! If you are willing to contribute, please get in touch with one of the project leads or via the repositories Discussions

Acknowledgements

Authors and Contributors

For a full list of all authors and contributors, see the contributors page.

Special mentions

Big thanks and shoutout to Francesco! 👏 who is at the origin of the project!

Also thanks to the awesome Haroune (@haroune-mohammedi) and Thomas (@thomas-quadratic) from Quadratic!

Other projects

Abiwan is greatly influenced by the similar project for EVM-compatible contracts wagmi/abitype.