/**
 * UserId Value Object
 * Represents a validated UUID-based user identifier
 */
export declare class UserId {
    private readonly _value;
    private static readonly UUID_REGEX;
    private constructor();
    get value(): string;
    /**
     * Create a UserId from an existing UUID string
     */
    static create(value: string): UserId;
    /**
     * Generate a new random UserId
     */
    static generate(): UserId;
    equals(other: UserId): boolean;
    toString(): string;
}
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