/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Observable } from 'rxjs/Observable';
/**
 * Interface for any component that provides a view of some data collection and wants to provide
 * information regarding the view and any changes made.
 */
export interface CollectionViewer {
    /**
     * A stream that emits whenever the `CollectionViewer` starts looking at a new portion of the
     * data. The `start` index is inclusive, while the `end` is exclusive.
     */
    viewChange: Observable<{
        start: number;
        end: number;
    }>;
}