NewableFunction not working as intended #44337

There is little info about NewableFunction except for the meeting notes in #27102 and the pr #27028.

As far as I understand the comments there, a NewableFunction should be "callable" with new Foo(...), right? Or do we have to stick with apply(...)/call(...)?

Example:

class Foo {}

function doSomething(clazz: NewableFunction) {
  new clazz();
  // This expression is not constructable.
  //   Type 'NewableFunction' has no construct signatures
}



doSomething(Foo); // passes but would fail with "normal functions" aka. CallableFunction

Question about workaround:

If NewableFunction works as desired should we stick with new Function.prototype.bind.call(clazz, undefined); or should we define our own "ConstructableFunction" (a lot of people suggest this and even angular did it):

eg.

export interface ConstructableFunction extends NewableFunction {
  new(...args: any[]): any
}