Adds A Generic El Type Parameter To Hooks Interfaces

[IdoLeshkowitz]

closes #3956

[SteffenDE]

Thank you :)

[vanderhoop]

What's the expected usage of this? I would have expected Hook<HTMLInputElement> to ensure that the el attribute would be typed as an HTMLInputElement, but on v1.1.9, typescript still reads it as the more generic HTMLElement. A changelog example would be helpful.

[SteffenDE]

@vanderhoop Hook already had a first generic argument in case you wanted to type other methods or attributes yourself. So it should be Hook<object, HTMLInputElement> where instead of object you could also pass something more specific, like:

interface SpecificHook {
  customAttribute: string;
}

const specificHook: Hook<SpecificHook, HTMLInputElement> = {...};

[vanderhoop]

thanks @SteffenDE! onward!