/**
 * Type of jitter to apply to the delay.
 * - `"none"`: no jitter is applied
 * - `"full"`: full jitter is applied (random value between `0` and `delay`)
 */
export declare type JitterType = "none" | "full";
export declare type BackoffOptions = Partial<IBackOffOptions>;
export interface IBackOffOptions {
    /**
     * Decides whether the `startingDelay` should be applied before the first call.
     * If `false`, the first call will occur without a delay.
     * @defaultValue `false`
     */
    delayFirstAttempt: boolean;
    /**
     * Decides whether a [jitter](https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/)
     * should be applied to the delay. Possible values are `"full"` and `"none"`.
     * @defaultValue `"none"`
     */
    jitter: JitterType;
    /**
     * The maximum delay, in milliseconds, between two consecutive attempts.
     * @defaultValue `Infinity`
     */
    maxDelay: number;
    /**
     * The maximum number of times to attempt the function.
     * Must be at least `1`.
     * @defaultValue `10`
     */
    numOfAttempts: number;
    /**
     * The `retry` function can be used to run logic after every failed attempt (e.g. logging a message,
     * assessing the last error, etc.).
     * It is called with the last error and the upcoming attempt number.
     * Returning `true` will retry the function as long as the `numOfAttempts` has not been exceeded.
     * Returning `false` will end the execution.
     * @defaultValue a function that always returns `true`.
     * @param e The last error thrown by the function.
     * @param attemptNumber The upcoming attempt number.
     * @returns `true` to retry the function, `false` to end the execution
     */
    retry: (e: any, attemptNumber: number) => boolean | Promise<boolean>;
    /**
     * The delay, in milliseconds, before executing the function for the first time.
     * @defaultValue `100`
     */
    startingDelay: number;
    /**
     * The `startingDelay` is multiplied by the `timeMultiple` to increase the delay between reattempts.
     * @defaultValue `2`
     */
    timeMultiple: number;
}
export declare function getSanitizedOptions(options: BackoffOptions): IBackOffOptions;