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Assert Laravel Package

beberlei/assert

Lightweight assertion library for validating method arguments and input data in PHP. Provides a fluent, readable API with many built-in rules (string, numeric, email, UUID, collection, etc.), clear exceptions, and easy extensibility for custom constraints.

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Product Decisions This Supports

  • Enables consistent validation logic across domain models and service layers, reducing boilerplate code and technical debt from repetitive guard clauses
  • Supports build-vs-buy decisions by providing a battle-tested solution for runtime assertions, avoiding custom implementation costs
  • Critical for libraries and multi-application projects requiring standardized input validation across codebases
  • Enhances developer productivity by replacing verbose if checks with expressive, chainable assertions that communicate intent clearly
  • Improves testability by centralizing validation rules and producing predictable exceptions for mocking and debugging

When to Consider This Package

  • ✅ When your codebase has scattered, inconsistent validation logic that’s hard to maintain or test
  • ✅ When you need context-specific error messages for debugging or user-facing feedback (e.g., API responses)
  • ✅ When building reusable PHP libraries or microservices requiring strict input validation independent of frameworks
  • ❌ When using
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