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Vishnu
Vishnu

Reputation: 1701

how to type extended class?

I have a set of classes extending a base class. And there is a function which might be called with an argument as any of the classes above. How do I type the function here?

For example:

class BaseClass {}

class A extends BaseClass {
// ...
}

class B extends BaseClass{
}

and here is the function I want to type:

function myfunc(arg){
 // do something
}

here the arg will be A or B or anything which is extended from BaseClass. (I don't prefer giving It as A | B, because there is a lot of classes and it is a generic function)

Upvotes: 0

Views: 20

Answers (1)

Yury Tarabanko
Yury Tarabanko

Reputation: 45121

As you wrote "it is a generic function". So give it a generic type argument with a constraint to extend BaseClass

function myfunc<T extends BaseClass>(arg: T){
 // do something
}

Upvotes: 1

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