/**
 * Username Value Object
 * Represents a validated username (3-50 characters, alphanumeric + underscore)
 */
export declare class Username {
    private readonly _value;
    private static readonly MIN_LENGTH;
    private static readonly MAX_LENGTH;
    private static readonly PATTERN;
    private constructor();
    get value(): string;
    static create(value: string): Username;
    equals(other: Username): boolean;
    toString(): string;
}
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