React Mixin Utility for ES6 Classes

react-mixin is a utility library designed to enable the use of traditional React mixins with ES6/TypeScript classes, addressing the absence of built-in support for this pattern in React's class-based components. While React itself has deprecated mixins in favor of Higher-Order Components and Hooks, this package serves as a specific migration path for legacy codebases that must integrate existing mixins with modern class syntax. The current stable version is 5.0.0, which notably adapted to React's `UNSAFE_` lifecycle methods. The library provides mechanisms to apply mixins to class prototypes for instance methods and to the classes themselves for static properties like `defaultProps` and `propTypes`. It differentiates itself by offering clear error handling for conflicting method names (instead of silent overwrites) and supporting an optional decorator syntax, allowing developers to manage mixins in a structured way within their class definitions. However, it explicitly advocates for avoiding mixins in new development.