/**
 * An abstract entity which defines the minimum shape of a delay decision class.
 */
export declare abstract class DelayDecider {
    /**
     * A number (in milliseconds) that seeds the delay decision.
     */
    abstract readonly delayBase: number;
    /**
     * Makes the determination on how many milliseconds to delay.
     *
     * @param attempts - The number of attempts on which to calculate the delay.
     */
    abstract decision(attempts: number): number;
}
export interface DelayDeciderOptions {
    /**
     * A number (in milliseconds) that seeds the delay decision.
     */
    delayBase?: number;
}
export declare class DefaultDelayDecider implements DelayDecider {
    readonly delayBase: number;
    /**
     * Creates a default delay decider function.
     *
     * @param options - The configuration options for a delay
     * decider. The delayBase option is a seeder for the delay decider and defaults to 100
     * milliseconds.
     */
    constructor(options?: DelayDeciderOptions);
    /**
     * Implements a linear backoff delay.
     *
     * @param attempts - The number of attempts on which to calculate the delay.
     * @returns The number of milliseconds that a subsequent should be delayed.
     */
    decision(attempts?: number): number;
}