/**
 * The allowed options object for `exponentialBackoffDelayCalculator`
 */
export interface DelayCalculator {
    jitter: boolean;
    jitterFactor: number;
    backOffFactor: number;
    baseWaitTime: number;
}
/**
 * Calculate retry timing
 *
 * `jitter`: "Slight irregular movement, variation, or unsteadiness,
 * especially in an electrical signal or electronic device"
 *
 * @param options - The options object
 *   - `jitter`: If the duration should be affected by a jitter effect
 *   - `jitterFactor`: How widely the jitter effect should vary
 *   - `backOffFactor`: How quickly the duration should back off
 *   - `baseWaitTime`: The base time when determining sleep duration
 * @returns The duration to sleep
 *
 * @example
 * const calcOpts: DelayCalculator = {
 *   jitter: true,
 *   jitterFactor: .3,
 *   backOffFactor: 2,
 *   baseWaitTime: 100,
 * }
 * // Create a retrier with a custom backoff
 * retryWithBackoff({retries: 3, delayCalculator: exponentialBackoffDelayCalculator(calcOpts)})
 */
export declare const exponentialBackoffDelayCalculator: ({ jitter, jitterFactor, backOffFactor, baseWaitTime, }: Partial<DelayCalculator>) => (attempt: number) => number;