/**
 * Copyright 2020, Optimizely
 *
 * 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.
 */
/**
 * RequestTracker keeps track of in-flight requests for EventProcessor using
 * an internal counter. It exposes methods for adding a new request to be
 * tracked, and getting a Promise representing the completion of currently
 * tracked requests.
 */
declare class RequestTracker {
    private reqsInFlightCount;
    private reqsCompleteResolvers;
    /**
     * Track the argument request (represented by a Promise). reqPromise will feed
     * into the state of Promises returned by onRequestsComplete.
     * @param {Promise<void>} reqPromise
     */
    trackRequest(reqPromise: Promise<void>): void;
    /**
     * Return a Promise that fulfills after all currently-tracked request promises
     * are resolved.
     * @return {Promise<void>}
     */
    onRequestsComplete(): Promise<void>;
}
export default RequestTracker;