[lukevp]

You should absolutely use TypeScript for this. This is exactly what TS is for, to assert your types (proptypes, interfaces, classes, etc.) Switch to .tsx files too. There's a bit of a learning curve for TS, but it's well worth it. You should also type your global store (whether it's in react or redux), your dispatchers, and your action creators. And if you're doing redux, consider redux-toolkit. Turn off implicit any, assert types on everything you can, don't use !, learn about union types.

Hit me up in the e-mail in my profile if you want to discuss this further, would be happy to help and discuss my reasoning further. I've been doing a LOT of TS code recently on all the major target platforms for React - browser, electron, and react-native. I manage a team who's built several applications now and we use TS for everything, including an automatically-generated TS api interface that exposes types from our C# REST backend using swagger directly to the client code.

[MaxLeiter]

As someone who's recently jumped into a TS codebase after using just JS for years, a blog post or resource with these tips would be very nice (even though some are obvious, a lot of people don't know they exist. Disabling implicit any was a PITA/huge help for me.) Do you say don't use ! because you can't make just anything truthy in TS, or is there another reason?

[jaaames]

He's referring to https://www.typescriptlang.org/docs/handbook/release-notes/t... rather than boolean coercion.