export function addEventListen( target: Window | HTMLElement, event: string, handler: EventListenerOrEventListenerObject, capture = false ) { if ( target.addEventListener && typeof target.addEventListener === 'function' ) { target.addEventListener(event, handler, capture); } } export function removeEventListen( target: Window | HTMLElement, event: string, handler: EventListenerOrEventListenerObject, capture = false ) { if ( target.removeEventListener && typeof target.removeEventListener === 'function' ) { target.removeEventListener(event, handler, capture); } }