import { ServiceBusMessage } from '@azure/service-bus';
import { SbMessageEmitter } from '@pebula/attribus';
export interface SbBackoffRetryOptions {
    /** The raw delay unit in milliseconds */
    delay?: number;
    /** The factor to use on the delay unit */
    factor?: number;
    /**
     * The distort factor (height = more random, 0 = no randomness)
     * E.G: For the value 10, the final delay will be multiplied by a value between 0.9 to 1.1
     */
    distortFactor?: number;
    retryCount?: number;
    delayType?: 'linear' | 'exponential';
    /**
     * Entity (queue or topic) to re-submit retry messages to.
     * If not set, the entity that this backoff is set on will be used.
     */
    reSubmitter?: SbMessageEmitter;
    /**
     * The key used to store the current retry count on the user properties object stored on the message.
     *
     * defaults to "SB_BACKOFF_RETRY_COUNT"
     */
    retryCountKey?: string;
    /**
     * What to do when the retry is maxed out.
     *
     * defaults to 'abandon'
     */
    onBackoffMaxRetry?: 'abandon' | 'deadLetter' | 'complete';
}
export declare const DEFAULT_BACKOFF_CONFIG: SbBackoffRetryOptions;
export declare function extractRetryCount(retryCountKey: string, msg: ServiceBusMessage): number | false;
export declare function calculateBackOffTime(config: SbBackoffRetryOptions, currentIteration: number): number;
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