A utility class that safely binds methods from a source object (class prototype) to a target Proxy handler, ensuring correct `this` context and preventing property shadowing. It stores original bound methods in a WeakMap keyed by the target object, and returns a function to clean up bindings. This pattern is used across multiple Proxy-based live collections (MediaList, NodeList, DOMTokenList, etc.) to avoid leaking internal methods. It is self-contained with no external dependencies beyond a few symbol definitions and could be extracted into a standalone package for any Proxy-heavy JavaScript project.

A static utility that parses CSS rule strings into structured objects (selector, properties, at-rule type, etc.). It handles regular style rules, media queries, keyframes, font-face, supports, container, and scope rules using regex-based tokenization. The parser is modular (each rule type has its own parsing method) and returns a consistent `IStyleRule` interface. It does not depend on the Happy DOM DOM tree or window context, making it reusable in any CSS parsing context, such as build tools or minifiers.

A static utility that parses data URIs (data:[<mediatype>][;base64],<data>) into their component parts: MIME type, charset, base64 flag, and decoded body as a Uint8Array. It validates syntax and handles percent-encoding. The class has no dependencies external to the JavaScript runtime and returns a simple interface. This is a classic reusable utility that could be extracted into a standalone npm package for any application needing to process inline data URIs.