Phpstan Sealed Classes Laravel Package

Product Decisions This Supports

• Enforces strict inheritance rules for sealed classes, reducing unintended subclassing and improving code maintainability.
• Supports architectural decisions around immutable or tightly controlled class hierarchies (e.g., value objects, domain entities).
• Integrates into CI/CD pipelines to catch violations early, reducing technical debt and debugging time.
• Enables safer refactoring by ensuring sealed class contracts are respected across the codebase.

When to Consider This Package

• ✅ Adopt when: Using PHP 8.1+ with sealed classes in your codebase; already using PHPStan for static analysis; needing to enforce strict inheritance boundaries in critical domain models.
• ❌ Avoid when: Project uses PHP <8.1 or doesn’t implement sealed classes; using alternative static analysis tools like Psalm; team lacks experience with PHPStan.

How to Pitch It (Stakeholders)

• Executives: "This tool proactively prevents bugs caused by unintended class inheritance, reducing production incidents and maintenance costs. By integrating with our existing PHPStan setup, it ensures code quality without slowing down development—directly impacting time-to-market for new features."
• Engineering: "Zero-runtime-overhead extension for PHPStan that validates sealed class usage during development and CI. Simple to configure: