This is possible because TypeScript allows you to define complex type definitions in the form of interfaces. This results in strict checks which in turn reduces the amount of possible bugs you might have produced without it.
Refactoring code and code navigation goes to the next level with the use of Typescript. As the codebase of a RN app grows, it can become too difficult to read, share, or maintain. Navigating these codebases can be tedious, and refactoring code is risky. Typescript actually helps you refactor code and prevent typos, making it far easier to maintain and update without changing any of its behaviors.
Using Typescript makes your code more predictive and helps in self-documenting the whole RN app code base because you can add types to variables, functions, and properties, making your code far easier to read, which in turns helps other developers understand each other's code, most of the developers time is spent reading code that other developers previously made, with Typescript the code reading experience is improved.
If you are starting a new project which is planned to be maintained on the long term, or even a RN project that you have already started, changing from JS to TS as the programming language has more benefits than not.