CODEWITHSUNDEEP
javascripttypescript
Leo Jiang
Leo Jiang

Reputation: 26183

In Typescript, is it possible to override a superclass property's type without overriding the value?

I have a superclass property with a generic type, e.g.:

class Super {
  static get foo(): Record<string, any> {
    return ...
  }
}

I thought I could override the type like this:

class Sub extends Super {
  static foo: SubType;
}

However, this sets Sub.foo to undefined. I want Sub.foo to maintain the same value, but have a new type. Is this possible?

The type for Sub.foo is different because Super.foo depends on other static properties of the subclass.

I think implementing an interface should work, but it'll be good to know if there's another way.

Upvotes: 2

Views: 508

Answers (1)

Aplet123
Aplet123

Reputation: 35560

Use declare to avoid compiling the variable into the actual Javascript:

class Sub extends Super {
  declare static foo: SubType;
}

Upvotes: 2

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