The best React Testing Library is Jest.

It has everything you need to write and run tests. It can scale from 1 test to 10,000 tests due to its ability to run tests in parallel, happily using as many cores as you care to give it. It comes with everything you need to write any type of test you want, from mocking async functions that depend on manipulating time to mocking out methods on a third-party library to isolate what code is actually under test.


The Best React Testing Library

The best router for React is React Router.

It has been the de facto standard for routing in a React for many years - almost as old as React itself.


The Best React Router

There isn't one best React State Management library.

Each option has their own different set of tradeoffs, and depending on your usecase one set of tradeoffs may be better or worse.

The closest option for one-size-fits-all is React Context, fortunately provided out of the box by React.


The Best React State Management

The best React Framework is Next.js.

Next.js prides itself on convention over configuration and it permeates every part of the developer experience. The out of the box settings defined by Next.js set up every developer on a path for success and enjoyment, letting you focus more on what you're trying to build then how to do it yourself.


The Best React Framework

The best React CSS in JS library is Emotion.

Emotion is able to do everything other CSS-in-JS libraries can do, and more. It's supremely flexible - it gets out of your way so you can write your CSS-in-JS just the way you want to. In that way it's extremely flexible and un-opinionated on how you write your styles.
