Today I finished my first TypeScript experiment with React.
Here are some thoughts after using ReasonReact first, and now TypeScript second.
Setup Is Not Better Than ReasonReact
I used Create React App to bootstrap the app.
npx create-react-app <project-name> --typescript
But then I had to setup ESLint and Prettier with TypeScript.
ReasonML & BuckleScript:
npm install -g bs-platform bsb -init <project-name> -theme react-hooks
After that you're done.
TypeScript is “easier”, at least at the beginning.
The React+TypeScript CheatSheets Are Invaluable
You should use them.
How Do I Get 100% Type-Safety?
How do you “make impossible states impossible”?
You'll soon have to reach for advanced concepts like Discriminated Unions. Those are quite more complicated than their ReasonML equivalent.
And how do you type Promises?
It's incredibly difficult to reach 100% type safety for a beginner. ReasonML provides a better story here.
The Code Is Hard To Read
Type inference doesn't work as well as in ReasonML/OCaml. As a consequence, you have to define types explicitly.
The code is quite verbose and harder to read.