Is Typescript lying to you?

Is Typescript lying to you?

Have you ever wondered why working with Typescript gives you sometimes such a headache? I am not referring to the fact that sporadically you need to make an enormous effort to satisfy the TS compiler. No, I mean that occasionally the perfect working code stops working without an easy-to-recognize cause.

Have you ever wondered why working with Typescript gives you sometimes such a headache? I am not referring to the fact that sporadically you need to make an enormous effort to satisfy the TS compiler. No, I mean that occasionally the perfect working code stops working without an easy-to-recognize _cause. And your API codes are among the _notorious suspects, aren’t they?

I have experienced it many times — as soon as my API changed, I started noticing weird bugs or unusual application behavior. It comes down to the factthere is no guarantee that the TS types are the same as the JS types in runtime. Typescript has not featured “types” in the classic sense so far.

Typescript contains type annotations instead of the real types which we are used to from conventional static typed languages.

The mechanism “not types, but type annotations” represents the essential difference between Typescript and Java or C#. Since TS types have usually been stripped away after compilation, there is no runtime support for TS types.

Actually, that is the point where TS is losing its beauty and usefulness.

For instance, I love the reflection in C#. I see it as a handy tool for a new whole level of magic. Without such “infrastructure support,” the dynamic languages cannot provide a reliable runtime serializer. Lacking this piece of functionality, your application contains a significant black hole where your application behavior might become corrupted.

A classic example is an API call; you have code like that:

interface User{
   Age: number;
}

software-development typescript static-typing dynamic-programming javascript

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