certifyAs

certifyAs is a JavaScript library that provides a declarative way to enforce type constraints on object properties. It allows developers to define a schema for an object, specifying the expected data type and optional validation rules for each property. This helps in catching type-related errors early in the development process and improves code reliability.

The core concept of certifyAs revolves around creating "schemas" which are plain JavaScript objects. These schemas map property names to type definitions. For example, a schema might define a property `name` as a string and a property `age` as a number. When an object is "certified" against a schema, certifyAs checks if the object's properties match the defined types and constraints. If mismatches are found, it throws an error, providing details about the failed validation.

certifyAs supports various primitive types such as strings, numbers, booleans, and arrays. It also allows for more complex types like objects themselves, enabling nested validation. Beyond basic type checking, it offers features for optional properties, default values, and custom validation functions for more specific checks. The library aims to be lightweight and easy to integrate into existing JavaScript projects, particularly those using frameworks or libraries that benefit from strong typing or runtime validation.