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.

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

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"]
  }
}

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!

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);

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.

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

Cairo:

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

Typescript:

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

Cairo:

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

Typescript:

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

npm run typecheck

# 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

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

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!

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