ljharb/define-properties

`define-properties` is a utility for defining multiple non-enumerable properties on an object at once, using `Object.defineProperty` when available and falling back to standard assignment in older environments. It allows selective overriding of existing properties through predicate functions and is particularly useful for library authors who need to extend objects without modifying their existing properties or enumerability. The library is designed for JavaScript developers working with object property management, especially those building libraries or frameworks that need to add properties to objects in a controlled, non-intrusive manner.