Compile-time type checking

One of the most common mistakes we make while writing JavaScript code is to misspell a property or a method name. Usually, we find out about the mistake when we get a runtime error. This can happen during development as well as during production. Hoping that we will know about the error before we deploy our code to the production environment isn't a comfortable feeling! However, this is not a problem specific to JavaScript; it is something common to all the dynamic languages. Even with lots of unit tests, these errors can slip by.

TypeScript provides a compiler, which takes care of such mistakes for us using static code analysis. If we take advantage of static typing, TypeScript will be aware of the existing properties a given object has, and if we misspell any of them, the compiler will warn us with a compile-time error.

Another great benefit of TypeScript is that it allows large teams to collaborate since it provides formal, verifiable naming. This way, it allows us to write easy-to-understand code.