KeyValueChanges

  
    interface KeyValueChanges<K, V> {  forEachItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;  forEachPreviousItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;  forEachChangedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;  forEachAddedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;  forEachRemovedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;}