import { ResizeObserverCallback } from './resize-observer-callback' ; export interface ResizeObserver { new ( callback ) ; /**
     * Adds target to the list of observed elements.
     */ observe : ( target : Element ) => void ; /**
     * Removes target from the list of observed elements.
     */ unobserve : ( target : Element ) => void ; /**
     * Clears both the observationTargets and activeTargets lists.
     */ disconnect : ( ) => void ; }