TypeScript has been very helpful in our react projects. There isn't much clutter, as usually the only types you define are props and state – things you want to

TypeScript has been very helpful in our react projects. There isn't much clutter, as usually the only types you define are props and state – things you want to know anyway. TypeScript doesn't prevent any bugs that tests would not, but it does so faster and more concisely. Tooling slowdown depends on your tooling setup; TypeScript can compile JSX on its own. PropTypes are useful if you're transitioning from a plain JS codebase. But if you can start with and go full TS, I highly recommend going that route.