/**
 * Copyright 2020 Google LLC. All Rights Reserved.
 *
 * 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.
 */
/**
 * Extends an object's prototype by another's.
 *
 * @param type1 The Type to be extended.
 * @param type2 The Type to extend with.
 * @ignore
 */
export declare function extend(type1: any, type2: any): void;
export declare function abortEvent(e: Event | null): void;
export declare function stopPropagation(e: Event | null): void;
export declare function omit(o: {
    [key: string]: any;
}, keys: string[]): {
    [key: string]: any;
};