import { Annotation, AnnotationId, Settings, Position } from '../types';
/**
 * Save annotations to LocalStorage
 */
export declare function saveAnnotations(annotations: Map<AnnotationId, Annotation>): boolean;
/**
 * Load annotations from LocalStorage
 */
export declare function loadAnnotations(): Map<AnnotationId, Annotation>;
/**
 * Clear annotations from LocalStorage
 */
export declare function clearAnnotations(): boolean;
/**
 * Save settings to LocalStorage
 */
export declare function saveSettings(settings: Settings): boolean;
/**
 * Load settings from LocalStorage
 */
export declare function loadSettings(): Partial<Settings> | null;
/**
 * Save theme preference
 */
export declare function saveTheme(theme: 'light' | 'dark'): boolean;
/**
 * Load theme preference
 */
export declare function loadTheme(): 'light' | 'dark' | null;
/**
 * Save the user-placed toolbar position
 */
export declare function saveToolbarPosition(position: Position): boolean;
/**
 * Load the user-placed toolbar position
 */
export declare function loadToolbarPosition(): Position | null;
/**
 * Create an auto-save handler that debounces saves
 */
export declare function createAutoSaver(getAnnotations: () => Map<AnnotationId, Annotation>, debounceMs?: number): {
    save: () => void;
    flush: () => void;
    destroy: () => void;
};
/**
 * Clean up all expired annotations across all pages
 */
export declare function cleanupExpiredAnnotations(): number;
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