import { Course } from '../store/useCourseStore';
/**
 * Adds a course to the visited courses list and updates user preferences
 * @param {Course} course - The course to add to visited courses
 * @returns {Promise<void>}
 */
export declare const addVisitedCourse: (course: Course) => Promise<void>;
/**
 * Gets the current list of visited course IDs from user preferences
 * @returns {string[]} Array of course IDs in "code:instance" format
 */
export declare const getVisitedCourses: () => string[];
/**
 * Subscribes to visited courses updates
 * @param {Function} callback - Function to call when visited courses list changes
 * @returns {Function} Unsubscribe function
 */
export declare const onVisitedCoursesUpdate: (callback: (courseIds: string[]) => void) => () => void;