formix_core 0.1.0

Generic, type-safe validation engine for Dart. Build composable, reusable validators with a fluent API. The core package of the Formix ecosystem.

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.1.0 - 2026-01-23

Added

• Initial release of formix_core
• Formix<T, E> - Base abstraction for all validators
• ValidationResult<T, E> - Sealed class with Valid, Invalid, and InvalidAll variants
• Rule<T, E> - Single validation rule abstraction
• PredicateRule<T, E> - Create rules from simple predicates
• FunctionRule<T, E> - Create rules from validation functions
• Composition utilities:
  • AllOf - Validate all rules (AND logic)
  • AnyOf - Validate any rule (OR logic)
  • Chain - Sequential validation with short-circuit
  • Conditional - Conditional validation
  • Optional - Skip validation for null values
  • Transform - Transform input before validation
• Caching utilities:
  • CachedFormix - Cache validation results
  • LazyFormix - Lazy validator initialization
  • LruCachedFormix - LRU cache for validation results
• Extension methods for fluent API:
  • .andThen() - Chain validators
  • .when() - Conditional validation
  • .optional() - Make validators optional
  • .cached() - Add caching
  • .lruCached() - Add LRU caching
• ErrorMessageFormatter - Format error messages with context