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constructor-patterns

Constructor and initializer patterns for deploying Solidity contracts. Use when designing deployment flows, upgradeable proxies, factory patterns, or CREATE2 deployments. Covers constructor validation, initializer safety, and factory patterns.

skills/constructor-patterns/SKILL.md

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# Constructor & Initializer Patterns

## Constructor for Non-Upgradeable Contracts

Constructors run once at deployment. Validate all parameters and set immutables.

```solidity
contract Vault {
    error ZeroAddress();
    error InvalidFee(uint256 fee);

    address public immutable TOKEN;
    address public immutable ORACLE;
    uint256 public immutable FEE_BPS;