I am using TypeScript 1.6 and would like to create an abstract class with an abstract method but use a lambda/arrow function in the concrete class.
Is this possible? The code shown below does not compile as it says
"Class 'Base' defines instance member function 'def', but extended class 'Concrete' defines it as instance member property"...
abstract class Base {
abstract abc(): void;
abstract def(): void;
}
class Concrete extends Base {
private setting: boolean;
public abc(): void {
this.setting = true;
}
public def = (): void => {
this.setting = false;
}
}
My understanding of Typescript specifications is that when you are declaring
public def = (): void => {
this.setting = false;
}
You are actually declaring a property
called def
and not a method
on the Base
class.
Properties cannot (unfortunately IMHO) be abstracted in Typescript: https://github.com/Microsoft/TypeScript/issues/4669