Cairo Setup

Project Scaffolding

Install toolchain and create a project:

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):

[dependencies]
openzeppelin = "<VERSION>"

Individual packages (faster builds — only compiles what you use):

[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

// 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:

component!(path: ERC20Component, storage: erc20, event: ERC20Event);

#[abi(embed_v0)]
impl ERC20MixinImpl = ERC20Component::ERC20MixinImpl<ContractState>;
impl ERC20InternalImpl = ERC20Component::InternalImpl<ContractState>;