/**
 * Storage interface for URL mappings
 */
export interface StorageInterface {
    get(id: number): Promise<string | undefined>;
    set(id: number, url: string, ttl?: number): Promise<void>;
    has(id: number): Promise<boolean>;
}
/**
 * In-memory storage implementation
 */
export declare class MemoryStorage implements StorageInterface {
    private storage;
    get(id: number): Promise<string | undefined>;
    set(id: number, url: string, ttl?: number): Promise<void>;
    has(id: number): Promise<boolean>;
}
/**
 * Redis storage implementation (optional)
 */
export declare class RedisStorage implements StorageInterface {
    private client;
    constructor(client: any);
    get(id: number): Promise<string | undefined>;
    set(id: number, url: string, ttl?: number): Promise<void>;
    has(id: number): Promise<boolean>;
}
/**
 * Validates if a string is a proper URL
 */
export declare function isValidUrl(url: string): boolean;
/**
 * Generates a short URL code from a numeric ID using base62 encoding
 * @param id - The numeric ID to encode
 * @returns The base62 encoded string
 */
export declare function encodeId(id: number): string;
/**
 * Decodes a short URL code back to its numeric ID
 * @param shortCode - The base62 encoded string
 * @returns The decoded numeric ID
 */
export declare function decodeShortUrl(shortCode: string): number;
/**
 * Configuration options for building a short URL
 */
export interface ShortUrlOptions {
    domain: string;
    includeRedirectPath?: boolean;
    redirectPathSegment?: string;
    includeProtocol?: boolean;
    protocol?: string;
    pathSeparator?: string;
}
/**
 * Default options for building a short URL
 */
export declare const DEFAULT_SHORT_URL_OPTIONS: ShortUrlOptions;
/**
 * Default storage instance (in-memory)
 */
export declare const defaultStorage: MemoryStorage;
/**
 * Stores a URL mapping using the specified storage
 * @param id - The numeric ID
 * @param originalUrl - The original URL
 * @param storage - Storage instance to use
 * @param ttl - Time to live in seconds (optional)
 */
export declare function storeUrlMapping(id: number, originalUrl: string, storage?: StorageInterface, ttl?: number): Promise<void>;
/**
 * Retrieves the original URL for a given ID
 * @param id - The numeric ID
 * @param storage - Storage instance to use
 * @returns The original URL if found, undefined otherwise
 */
export declare function getOriginalUrl(id: number, storage?: StorageInterface): Promise<string | undefined>;
/**
 * Checks if a URL mapping exists
 * @param id - The numeric ID
 * @param storage - Storage instance to use
 * @returns True if the mapping exists, false otherwise
 */
export declare function hasUrlMapping(id: number, storage?: StorageInterface): Promise<boolean>;
/**
 * Builds a complete short URL with domain and customizable options
 * @param id - The numeric ID to encode
 * @param options - Configuration options for the short URL
 * @returns The complete short URL
 */
export declare function buildShortUrl(id: number, options?: string | ShortUrlOptions): string;