/**
 *    Container to describe a single change to a cache
 */
import { ChangeReason } from './ChangeReason';
export declare class Change<TObject, TKey> {
    /**
     *  The unique key of the item which has changed
     */
    readonly key: TKey;
    /**
     *  The  reason for the change
     */
    readonly reason: ChangeReason;
    /**
     *  The item which has changed
     */
    readonly current: TObject;
    /**
     *  The current index
     */
    readonly currentIndex: number;
    /**
     *  The previous change.
     *
     *  This is only when Reason==ChangeReason.Replace.
     */
    readonly previous?: TObject;
    /**
     *  The previous change.
     *
     *  This is only when Reason==ChangeReason.Update or ChangeReason.Move.
     */
    readonly previousIndex?: number;
    /**
     *  Initializes a new instance of the <see cref="Change{TObject, TKey}"/> object.
     *  @param reason The reason
     *  @param key The key
     *  @param current The current
     */
    constructor(reason: ChangeReason, key: TKey, current: TObject);
    /**
     *  Initializes a new instance of the <see cref="Change{TObject, TKey}"/> object.
     *  @param reason The reason
     *  @param key The key
     *  @param current The current
     *  @param index The index
     */
    constructor(reason: ChangeReason, key: TKey, current: TObject, index?: number);
    /**
     *  Constructor for ChangeReason.Move
     *  @param reason The reason
     *  @param key The key
     *  @param current The current
     *  @param currentIndex The CurrentIndex
     *  @param previousIndex CurrentIndex of the previous
     */
    constructor(reason: 'moved', key: TKey, current: TObject, currentIndex: number, previousIndex: number);
    /**
     *  Initializes a new instance of the <see cref="Change{TObject, TKey}"/> object.
     *  @param reason The reason
     *  @param key The key
     *  @param current The current
     *  @param previous The previous
     *  @param currentIndex Value of the current
     *  @param previousIndex Value of the previous
     */
    constructor(reason: ChangeReason, key: TKey, current: TObject, previous?: TObject, currentIndex?: number, previousIndex?: number);
    toString(): string;
}