/*!
  Copyright 2018 Ron Buckton (rbuckton@chronicles.org)

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */
/** @module "iterable-query/fn" */
import { AsyncHierarchyIterable, PossiblyAsyncHierarchyIterable } from "../types";
/**
 * Creates an [[AsyncHierarchyIterable]] for the bottom-most elements. Elements of `source` that are an ancestor of any other
 * element of `source` are removed.
 *
 * @param source A [[HierarchyIterable]] or [[AsyncHierarchyIterable]] object.
 * @param predicate An optional callback used to filter the results.
 * @category Hierarchy
 */
export declare function bottomMostAsync<TNode, T extends TNode, U extends T>(source: PossiblyAsyncHierarchyIterable<TNode, T>, predicate: (element: T) => element is U): AsyncHierarchyIterable<TNode, U>;
/**
 * Creates an [[AsyncHierarchyIterable]] for the bottom-most elements. Elements of `source` that are an ancestor of any other
 * element of `source` are removed.
 *
 * @param source A [[HierarchyIterable]] or [[AsyncHierarchyIterable]] object.
 * @param predicate An optional callback used to filter the results.
 * @category Hierarchy
 */
export declare function bottomMostAsync<TNode, T extends TNode>(source: PossiblyAsyncHierarchyIterable<TNode, T>, predicate?: (element: T) => boolean | PromiseLike<boolean>): AsyncHierarchyIterable<TNode, T>;
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