/**
 * Effective Style Manager
 *
 * Resolves CSS declarations from theme classes or IDs at runtime via CSSOM,
 * then re-emits them under selector chains built from effectiveStyles.
 *
 * - `selector` is only used to look up CSS values from CSSOM (the source to copy).
 * - `target` is the complete output CSS selector (no auto-prepending).
 *
 * Target separator rules:
 *   - space → nested (descendant):    ".qo-font-md span div"  → .qo-font-md span div { }
 *   - comma → compound (same element): ".qo-font-md span,.k-font" → .qo-font-md span.k-font { }
 *
 * The generated <style> tags are temporary — cleaned up when the consumer unmounts.
 */
export type EffectiveStyle = {
    selector: string;
    target: string;
    important?: boolean;
};
/**
 * Processes an array of effective style items. Each item specifies which
 * class or ID to copy CSS from, which target selectors to apply to, and
 * whether to use !important.
 *
 * @returns A cleanup function that removes all injected styles.
 *
 * @example
 *   // selector = value source, target = full output selector
 *   applyEffectiveStyles([
 *     { selector: ".qo-font-md", target: ".qo-font-md span", important: true }
 *   ]);
 *   // → .qo-font-md span { font-size: 12px !important }
 *
 *   // Compound (comma) — same element
 *   applyEffectiveStyles([
 *     { selector: ".qo-font-md", target: ".qo-font-md span,.k-input" }
 *   ]);
 *   // → .qo-font-md span.k-input { font-size: 12px }
 *
 *   // ID source
 *   applyEffectiveStyles([
 *     { selector: "#myWidget", target: "#myWidget span" }
 *   ]);
 *   // → #myWidget span { ... }
 */
export declare function applyEffectiveStyles(items: EffectiveStyle[]): () => void;
/**
 * Invalidates the CSSOM cache for a selector (useful if stylesheets change dynamically).
 */
export declare function invalidateStyleCache(selector?: string): void;