import type { AxiosRetryerBackoffType } from '../types';
/**
 * Returns a delay (in milliseconds) given an attempt number and a backoff strategy.
 *
 * @param attempt - The number of the current retry attempt (1-based)
 * @param backoffType - 'static', 'linear', or 'exponential'
 *    - 'static': returns a fixed 1000ms delay
 *    - 'linear': grows linearly with attempt (1000 * attempt)
 *    - 'exponential': doubles with each attempt (1000 * 2^(attempt - 1))

 * @returns The calculated delay in milliseconds.
 *
 * @example
 *   getBackoffDelay(1, 'static')                -> 1000
 *   getBackoffDelay(3, 'linear')                -> 3000
 *   getBackoffDelay(4, 'exponential')      -> 8000 ± up to 500 ms
 */
export declare function getBackoffDelay(attempt: number, backoffType: AxiosRetryerBackoffType): number;