/**
 * Copyright 2020 Google LLC
 *
 * 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.
 */
/**
 * Asynchronously loads a script keeping track of which scripts have already
 * requested and loaded.
 *
 * Multiple requests to the same resource will return the same promise.
 *
 * @param src Script URL to load
 */
export declare function loadScript(src: string): Promise<void>;
/**
 * Clears the script cache. Used for testing purposes only.
 */
export declare function clearScriptCache(): void;