Find function does not return DOMWrapper type as declared

[iliubinskii]

Subject of the issue

The following code:

const wrapper = mount({
  template: '<div class="existent"></div>'
});
console.log(wrapper.find(".existent") instanceof DOMWrapper);
console.log(wrapper.find(".non-existent") instanceof DOMWrapper);

returns "true false".

But according to function declaration:

abstract find(selector: string): DOMWrapper<Element>;

it should return "true true".

The problem is that inside JEST matcher I can't easily check that value is wrapper.

Steps to reproduce

See the first code snippet above.

Expected behaviour

Find function should return DOMWrapper as declared.

OR

It should return "DOMWrapper | NotFoundWrapper" and it should be declared accordingly.

Actual behaviour

Function does not return what is declared.

Possible Solution

1. Return DomWrapper for non-existent element
2. Return DOMWrapper | NotFoundWrapper