/**
 * Options for StringArrayTransform decorator.
 */
type StringArrayTransformOptions = {
    trim?: boolean;
    unique?: boolean;
    lowercase?: boolean;
};
/**
 * Property decorator to normalize and sanitize an array of strings.
 * Applies trimming, lowercasing, and deduplication as configured.
 *
 * @param {StringArrayTransformOptions} opts - Transformation configuration.
 * @returns {PropertyDecorator} - Transforms a property into a cleaned string array.
 */
export declare function StringArrayTransform(opts?: StringArrayTransformOptions): PropertyDecorator;
export {};