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/**
* @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 { CollectionViewer, DataSource } from '@angular/cdk/collections';
import { Observable } from 'rxjs';
/**
* Data source for nested tree.
*
* The data source for nested tree doesn't have to consider node flattener, or the way to expand
* or collapse. The expansion/collapsion will be handled by TreeControl and each non-leaf node.
*/
export declare class MatTreeNestedDataSource<T> extends DataSource<T> {
/**
* Data for the nested tree
*/
get data(): T[];
set data(value: T[]);
private readonly _data;
connect(collectionViewer: CollectionViewer): Observable<T[]>;
disconnect(): void;
}