setup-cairo-contracts
Set up a Cairo smart contract project with OpenZeppelin Contracts for Cairo on Starknet. Use when users need to: (1) create a new Scarb/Starknet project, (2) add OpenZeppelin Contracts for Cairo dependencies to Scarb.toml, (3) configure individual or umbrella OpenZeppelin packages, or (4) understand Cairo import conventions and component patterns for OpenZeppelin.
What this skill does
# Cairo Setup
## Project Scaffolding
Install toolchain and create a project:
```bash
curl --proto '=https' --tlsv1.2 -sSf https://sh.starkup.sh | sh
scarb new my_project --test-runner=starknet-foundry
```
This scaffolds a complete Starknet project with `snforge` testing preconfigured.
## OpenZeppelin Dependencies
Look up the current version from https://docs.openzeppelin.com/contracts-cairo before adding. Add to `Scarb.toml`:
Full library (umbrella package):
```toml
[dependencies]
openzeppelin = "<VERSION>"
```
Individual packages (faster builds — only compiles what you use):
```toml
[dependencies]
openzeppelin_token = "<VERSION>"
openzeppelin_access = "<VERSION>"
```
Available individual packages: `openzeppelin_access`, `openzeppelin_account`, `openzeppelin_finance`, `openzeppelin_governance`, `openzeppelin_interfaces`, `openzeppelin_introspection`, `openzeppelin_merkle_tree`, `openzeppelin_presets`, `openzeppelin_security`, `openzeppelin_token`, `openzeppelin_upgrades`, `openzeppelin_utils`.
> `openzeppelin_interfaces` and `openzeppelin_utils` are versioned independently. Check the docs for their specific versions. All other packages share the same version.
## Import Conventions
The import path depends on which dependency is declared:
- **Umbrella package** (`openzeppelin = "..."`): use `openzeppelin::` as the root
- **Individual packages** (`openzeppelin_token = "..."`): use the package name as the root
```cairo
// Individual packages
use openzeppelin_token::erc20::{ERC20Component, ERC20HooksEmptyImpl};
use openzeppelin_access::ownable::OwnableComponent;
use openzeppelin_upgrades::UpgradeableComponent;
// Umbrella package equivalents
use openzeppelin::token::erc20::{ERC20Component, ERC20HooksEmptyImpl};
use openzeppelin::access::ownable::OwnableComponent;
use openzeppelin::upgrades::UpgradeableComponent;
```
Components are integrated via the `component!` macro, embedded impls, and substorage:
```cairo
component!(path: ERC20Component, storage: erc20, event: ERC20Event);
#[abi(embed_v0)]
impl ERC20MixinImpl = ERC20Component::ERC20MixinImpl<ContractState>;
impl ERC20InternalImpl = ERC20Component::InternalImpl<ContractState>;
```
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