TypeScript variable that hold a class instance that extends a base class

Question

I want to have a variable to stores a class instance array, but I want to specify the data type as anything that inherits from a 'base' class. This better demonstrated by example:

class Mom { } //Base class
class Son extends Mom { }
class Daughter extends Mom { }

//What is the syntax for this?
let example : <T extends Mom>T[] = [ ]; //This array should store anyting that extends 'Mom'

//The this would be possible
example.push(new Mom());
example.push(new Son());
example.push(new Daughter());

Thanks in advance.

Answer 1

Try this way

let example : Array<Mom> = [ ];

See here

Answer 2

You can do things like

type Shape = Mom | Son | Daughter;
let example:Array<Shape> = new Array<Shape>();