/**
 * Placeholder text color utilities (placeholder:text-{color})
 *
 * React Native only supports styling the COLOR of placeholder text via placeholderTextColor prop.
 * Other text styling properties (font-size, font-weight, etc.) are not supported.
 */
/**
 * Parse placeholder modifier classes to extract color
 *
 * Only text-{color} classes are supported inside placeholder: modifier.
 * Other utilities (font-*, text-lg, etc.) will log warnings.
 *
 * @param cls - Class name inside placeholder: modifier (e.g., "text-red-500")
 * @param customColors - Optional custom color palette from tailwind.config
 * @returns Color string (hex with optional alpha) or null if invalid
 *
 * @example
 * parsePlaceholderClass("text-red-500") // "#ef4444"
 * parsePlaceholderClass("text-red-500/50", {}) // "#ef444480"
 * parsePlaceholderClass("text-brand-primary", { "brand-primary": "#123456" }) // "#123456"
 * parsePlaceholderClass("font-bold") // null (+ warning)
 */
export declare function parsePlaceholderClass(cls: string, customColors?: Record<string, string>): string | null;
/**
 * Parse multiple placeholder classes and return the last valid color
 * (Later classes override earlier ones, matching CSS cascade behavior)
 *
 * @param classes - Space-separated class names
 * @param customColors - Optional custom color palette
 * @returns Color string or null
 *
 * @example
 * parsePlaceholderClasses("text-red-500 text-blue-500") // "#3b82f6" (blue wins)
 * parsePlaceholderClasses("text-red-500 font-bold") // "#ef4444" (ignores font-bold)
 */
export declare function parsePlaceholderClasses(classes: string, customColors?: Record<string, string>): string | null;