import { CSSProperties } from "react";
export type StyleConfig = {
    appWrapperStyle: CSSProperties;
    modalStyle: CSSProperties;
    iframeWrapperStyle: CSSProperties;
    iframeStyle: CSSProperties;
};
/**
 * Hook to manage style state and updates from postMessage events.
 *
 * Encapsulates:
 * - Style state management (current styles and loaded status)
 * - Style merging logic via postMessage
 * - Origin validation
 * - Fallback timeout to ensure modal displays even if STYLE_CONFIG is not received
 *
 * @param zeroHashAppURL - The app URL used for origin validation
 * @param defaultStyles - Default style configuration to use as fallback
 * @returns Object containing current styles, loaded status, and handler function
 */
export declare const useStyleUpdates: (zeroHashAppURL: string, defaultStyles: StyleConfig) => {
    styles: StyleConfig;
    stylesLoaded: boolean;
    handleStyleConfig: (incomingStyles: Partial<StyleConfig>, eventOrigin: string) => boolean;
};