/**
 * Utility to inject CSS into shadow DOM elements
 *
 * This utility is kept for potential future use with other shadow DOM components.
 */
export interface CSSInjectionOptions {
    /** The CSS string to inject */
    css: string;
    /** CSS selector to find elements to inject into */
    selector?: string;
    /** Whether to inject into all matching elements or just the first */
    all?: boolean;
    /** Custom style ID to avoid duplicate injections */
    styleId?: string;
}
/**
 * Injects CSS into the shadow DOM of elements
 * @param options Configuration options for CSS injection
 */
export declare function injectCSSIntoShadowDOM(options: CSSInjectionOptions): void;