Property 'clientX' does not exist on type 'Event'. Angular2 Directive

I'm trying to listen to the X position of my mouse in an Angular2 Directive like this:

@HostListener('mousemove', ['$event'])
onMousemove(event: Event): void {
console.log(event.clientX)
}


but I get the error

Property 'clientX' does not exist on type 'Event'.
​

This is odd because this listener

@HostListener('mousemove', ['$event'])
onMousemove(event: Event): void {
console.log(event)
}


logs out an event object



Why can I not access event.clientX?

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