Web Theme Loader, hand-crafted or AI generated

I have crafted one from scratch based on specific functional requirements and technical requirements, conforming to my design principles for UI, UX and Developer Experience. Developer Experience expected: Rich features with small API surface. Flexibility. Portability & Reusability. If you just want to use this loader right away, please check "Web Theme Loader with Comprehensive Features and Minimum API Surface" This article is the first in a series of articles comparing hand‑crafted code and code generated by AI agents on a non‑trivial topic. Requirements User Story As a web app user, I want to choose from multiple available themes — sometimes light, other times dark. Work Order Develop a TypeScript‑based, framework‑agnostic API that exposes reusable helpers and abstractions for implementing theme pickers in web applications. The API should remain independent of any specific framework while optionally offering seamless integration points for Angular. Functional Requirements Support