Typescript is flexible
The code is more robust
TypeScript helps to make more robust code.
Giving a type to each piece of data is a way to structure your data
Team collaboration is easier
It makes cooperation between developers easier and more productive.
The type system is a way to specify what kind of data we want to work with. By being more explicit, we remove confusion or potential misunderstandings.
The IDE is more powerful
It makes the IDE more helpful. The IDE is able to spot inconsistencies before code execution. It can give you better autocompletion.