Hi. I've found that I can't use getBoundingClientRect with MouseEvent in typescript.

onClick: (event: MouseEvent): void => {
  const { left, top } = event.target.getBoundingClientRect();
  const { left, top } = event.nativeEvent.target.getBoundingClientRect();
},

Typescript message I see in VS code is:

Property 'getBoundingClientRect' does not exist on type 'EventTarget'.ts(2339)

This is what worked for me, but I guess for MouseEvent it should work out of the box const node = event.target as HTMLElement;