Adopting a framework means programming against a set of abstractions not designed for your application, but for a "common use case". Using these abstractions does not require understanding their implementation details. This can be a good thing. On the other hand, it robs developers of potential learning experiences.
This project lists a set of common patterns and features found in JS applications, and re-implements them in plain JS. Partially as a learning experience for the author, partially as a demonstration that frameworks shouldn't be treated as black boxes of dark magic.