JavaScript Type Validation and Coercion

The `type` package offers a suite of runtime validation and processing utilities for fundamental JavaScript types, engineered for environments supporting ECMAScript 3 and higher without implying any transpilation. It specializes in bulletproof input argument normalization and validation, making it highly suitable for validating public API endpoints. The library's current stable version is 2.7.3, released in May 2024, and it follows an irregular release cadence, focusing on maintenance improvements and incremental feature additions like `BigInt` or `Map`/`Set` validation. Its core differentiators include a deep respect for JavaScript's inherent language nature and quirks, offering restricted forms of type coercion that explicitly reject invalid input while intelligently normalizing permissible type deviations. It provides `coerce`, `is`, and `ensure` utilities for various types, enabling developers to confirm types, safely coerce values, or strictly validate them with configurable error handling, including options for optional values and default fallbacks. It's explicitly positioned for basic type checks, recommending more powerful schema-based utilities like AJV or Joi for complex, deeply nested object structures.