✨ Features

• ✅ Validate a single value with a function, RegExp, or None
• ✅ Validate multiple entries at once
• ✅ Build schema-based validation models with CustomClassicModel
• ✅ TypeScript types bundled — no separate @types package
• ✅ Generic validate<T> / nestvalidate<T> — result type inferred from input
• ✅ Type-narrowing guards (asserts value is T) on every public method
• ✅ "Expected X, got Y" error descriptions on every guard failure
• ✅ Forge and reuse schemas across different payload shapes (partial-payload matching)
• ✅ Zero dependencies
• ✅ Built-in validators for username, email, phone, password, and required
• ✅ URL validation with opt-in constraint rules
• ✅ Input normalisation via Normalizer
• ✅ None sentinel — explicitly skip validation for any field
• ✅ Recursive nested-schema validation — error tree mirrors your data's shape
• ✅ __File() — validate File objects atomically inside nestvalidate
• ✅ Runtime schema mutation via extend() / remove() / swap()

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