type RetryOptions = {
    retries?: number;
    delay?: number;
    maxDelay?: number;
    exponential?: boolean | number;
    throwOnExhaustion?: boolean;
    retryIf?: (error: Error) => boolean;
    onRetry?: (error: Error, attempt: number) => void;
};
export declare function retry<T>(fn: () => Promise<T>, options: RetryOptions & {
    throwOnExhaustion: false;
}): Promise<T | null>;
export declare function retry<T>(fn: () => Promise<T>, options?: RetryOptions & {
    throwOnExhaustion?: true;
}): Promise<T>;
export {};