Defining this Parameter Types

function handleToggle(this: HTMLElement) {
  this.classList.toggle("clicked");
}

type ToggleFn = typeof handleToggle;
// (this: HTMLElement) => void

type WithoutThis = OmitThisParameter<ToggleFn>
// () = > void

type ToggleFnThis = ThisParameterType<ToggleFn>
// HTMLElement