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.

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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 |
| 2.2.3 | Cairo v2.4.4 |

Getting Started

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https://github.com/haroune-mohammedi/abi-wan-kanabi/assets/118889688/b7e20ab0-7314-402d-99fa-2888c20136c9

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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:

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

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

`typescript
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:

`bash
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:

`typescript
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!

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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

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

`javascript
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

`typescript
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

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| 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 |

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| Cairo | TypeScript |
| ------------------------- | --------------------------------------------------- |
| Option | T \| undefined |
| Array | T[] |
| Span | 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:

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

Typescript:

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

#### Enum example

Cairo:

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

Typescript:

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

Contributing

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`bash
npm run typecheck
`

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`bash


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

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

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

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

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