Utility Types

We will assume knowledge of utility types covered in the sister project typescript-cheatsheets/utilities. Look up libraries included there as well for your typing needs.

If you intend to maintain a large TS codebase/a nontrivial React+TS library, we strongly recommend exploring these utilities so that you don't reinvent the wheel and/or lose sanity trying to do so. Studying their code can also teach you a lot of advanced TS that is not covered here.

I also recommend have a good working knowledge of how to construct the inbuilt utility types from scratch. See Dr. Rauschmayer's guide for a concise introduction.

A level of comfort with generic types is therefore required. Here are some helpful resources:

• https://ts.chibicode.com/generics/