export declare const addInsertRuleListener: (fn: () => void) => void;
export declare const removeInsertRuleListener: (fn: () => void) => void;
export declare const copyStyleSheets: (newHeadMountElement: HTMLDivElement) => void;
/**
 * Add listener for dynamic style changes
 * This works by listening to any changes to the head element
 * If there are any changes it replaces all the styles in the floating window
 * at most every 100ms
 * @param onStyleChange throttled callback to trigger a style copy
 */
export declare const observeStyleSheetChanges: (onStyleChange: () => void) => MutationObserver | null;