/**
 * Utility functions for CSS converters to handle type-safe value conversion
 */
export declare function toString(value: any): string;
export declare function toPxOrString(value: any): string;
export declare function toNumber(value: any): number;
export declare function isString(value: any): value is string;
export declare function isNumber(value: any): value is number;
export declare function isArray(value: any): value is any[];