/**
 * @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 { SelectionModel } from './selection';
/**
 * Interface for a class that can flatten hierarchical structured data and re-expand the flattened
 * data back into its original structure. Should be used in conjunction with the cdk-tree.
 */
export interface TreeDataNodeFlattener<T> {
    /** Transforms a set of hierarchical structured data into a flattened data array. */
    flattenNodes(structuredData: any[]): T[];
    /**
     * Expands a flattened array of data into its hierarchical form using the provided expansion
     * model.
     */
    expandFlattenedNodes(nodes: T[], expansionModel: SelectionModel<T>): T[];
    /**
     * Put node descendants of node in array.
     * If `onlyExpandable` is true, then only process expandable descendants.
     */
    nodeDescendents(node: T, nodes: T[], onlyExpandable: boolean): void;
}