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x-value is a medium-neutral runtime type validation library designed to validate configuration files and generate corresponding JSON schemas.


The project “x-value” is a runtime type validation library with a primary focus on medium-neutrality, enabling it to validate configuration files across different mediums efficiently and generate corresponding JSON schemas. This library is distinguished by its TypeScript-like type definition interface, which simplifies the process of defining types for runtime validation. Additionally, it facilitates the generation of static types through the use of x.TypeOf<>, making it a versatile tool for developers.

One of the key features of x-value is its ability to validate runtime configuration objects through methods such as asserts, satisfies, and sanitize. This functionality is crucial for ensuring that configuration objects adhere to the specified types at runtime, enhancing the reliability and stability of applications. Furthermore, x-value’s capability to generate JSON schemas for complex project configurations is a significant advantage. These schemas can be utilized with editor support to provide auto-completion and simple validation, streamlining the development process and reducing the potential for errors.

The concept of medium neutrality is central to x-value, allowing it to support different types across various mediums effectively. This feature is particularly beneficial for RPC (Remote Procedure Call) infrastructure, as it enables the library to support custom types across different mediums. For example, it can treat dates as strings in RPC payloads or MongoDB object IDs as strings in browsers and RPC payloads. This flexibility ensures that x-value can be adapted to a wide range of project requirements, making it a versatile solution for developers.

Another notable advantage of x-value is its support for retaining nominal type information across types. This is achieved through the .nominal() method, which allows developers to add meaningful configuration descriptions, enhancing the clarity and maintainability of code. Despite its limited usage externally, x-value has been extensively utilized in various internal projects, demonstrating its effectiveness and reliability. The library’s commitment to quality is further evidenced by its 100% test coverage, ensuring that it meets the highest standards of performance and reliability.

In summary, x-value offers a comprehensive solution for runtime type validation and JSON schema generation, characterized by its medium-neutrality, TypeScript-like interface, and robust validation methods. Its support for custom types and nominal type information, along with its proven track record in internal projects, make it an invaluable tool for developers seeking to enhance the reliability and efficiency of their applications.

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