/**
 * Options for StringTransform decorator.
 */
type StringTransformOptions = {
    trim?: boolean;
    lowercase?: boolean;
    uppercase?: boolean;
    capitalize?: boolean;
    omitEmpty?: boolean;
};
/**
 * Property decorator for sanitizing string inputs.
 * Supports trimming, case transformation, and capitalizing the first character.
 *
 * @param {StringTransformOptions} opts - Configuration for string transformations.
 * @returns {PropertyDecorator} - A decorator to standardize string properties.
 */
export declare function StringTransform(opts?: StringTransformOptions): PropertyDecorator;
export {};