There are already browser standards for HTTP and date/currency formatting. At most you need a polyfill if you want to support really old browsers. CSS transitio

There are already browser standards for HTTP and date/currency formatting. At most you need a polyfill if you want to support really old browsers. CSS transitions also take care of most use cases for animations. A library for dependency injection is just over-complicating things. You don't really need it. The only thing in that list that I have ever felt a need to use a library for is routing.