export declare class Id {
    private readonly _value;
    private _isNew;
    /**
     * Create a new Id
     * @param value - Optional existing ID value. If not provided, generates a new UUID.
     *
     * @example
     * // New entity (generates UUID)
     * const newId = new Id();
     * newuser.isNew() // true
     *
     * // Existing entity (uses provided ID)
     * const existingId = new Id("550e8400-e29b-41d4-a716-446655440000");
     * existinguser.isNew() // false
     */
    constructor(value: string, isNew?: boolean);
    constructor(value?: string);
    /**
     * Get the string value of the ID
     */
    get value(): string;
    /**
     * Check if this ID represents a new entity
     */
    isNew(): boolean;
    /**
     * Convert to string (for JSON serialization and comparisons)
     */
    toString(): string;
    /**
     * Convert to JSON (returns the string value)
     */
    toJSON(): string;
    /**
     * Check equality with another Id or string
     */
    equals(other: Id | string): boolean;
    /**
     * Generate a UUID v4
     */
    private generateUUID;
    /**
     * Create a new Id (convenience static method)
     */
    static create(): Id;
    /**
     * Mark the Id as not new
     */
    markAsNotNew(): void;
    /**
     * Mark the Id as new
     */
    markAsNew(): void;
    /**
     * Create an Id from an existing value
     */
    static from(value: string): Id;
    /**
     * Compose two IDs into a single ID
     * @param a - The first ID
     * @param b - The second ID
     * @returns The composed ID
     */
    static compose(a: string | Id, b: string | Id): string;
}
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