import { Result } from "./result";
import { ValueObject } from "./value-object";
/**
 * Represents a unique identifier.
 *
 * UniqueId encapsulates the concept of identity and provides type safety for IDs.
 * By default, it uses UUID v4, but can accept custom ID values when provided.
 *
 * @example
 * // Generate a new ID
 * const id = new UniqueId();
 *
 * // Use an existing ID
 * const existingId = UniqueId.create("550e8400-e29b-41d4-a716-446655440000");
 * if (existingId.isSuccess) {
 *   const id = existingId.value;
 *   console.log(id.toString()); // "550e8400-e29b-41d4-a716-446655440000"
 * }
 */
export declare class UniqueId extends ValueObject<{
    value: string;
}> {
    /**
     * Creates a new UniqueId.
     * If no id is provided, generates a new UUID v4.
     *
     * @param id Optional existing ID value
     */
    constructor(id?: string);
    /**
     * Creates a UniqueId with validation.
     *
     * @param id The ID string to validate
     * @returns A Result containing either the UniqueId or an error
     */
    static create(id: string): Result<UniqueId>;
    /**
     * Returns the string representation of this ID.
     */
    toString(): string;
    /**
     * Returns the string representation when converted to JSON.
     */
    toJSON(): string;
    /**
     * Creates a deep copy of this UniqueId.
     */
    clone(): UniqueId;
}