All the standard array and stream operators, map, filter, etc are reducers under the hood. But how do you efficiently compose them? Reducers have a different shape (a, i) => j from easily composable functions. The answer is transducers, a transducer is a high order reducer ie: (reducer) => reducer.

Another cheatsheet for using React with Typescript.

A React in Typescript Cheat Sheet

react-typescript-cheatsheet/README.md at master · sw-yx/react-typescript-cheatsheet · GitHub

A good basic introduction to setting up a webpack based react app. You could easily modify this to suit a different library or framework.