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1/**
2 * @license
3 * Copyright 2019 Google LLC
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17/**
18 * The maximum milliseconds to increase to.
19 *
20 * <p>Visible for testing
21 */
22export declare const MAX_VALUE_MILLIS: number;
23/**
24 * The percentage of backoff time to randomize by.
25 * See
26 * http://go/safe-client-behavior#step-1-determine-the-appropriate-retry-interval-to-handle-spike-traffic
27 * for context.
28 *
29 * <p>Visible for testing
30 */
31export declare const RANDOM_FACTOR = 0.5;
32/**
33 * Based on the backoff method from
34 * https://github.com/google/closure-library/blob/master/closure/goog/math/exponentialbackoff.js.
35 * Extracted here so we don't need to pass metadata and a stateful ExponentialBackoff object around.
36 */
37export declare function calculateBackoffMillis(backoffCount: number, intervalMillis?: number, backoffFactor?: number): number;