interface VideoProgressStorage {
    [courseId: string]: number;
}
/**
 * Retrieves the video progress for a specific course from localStorage.
 * @param courseId - The ID of the course.
 * @returns The progress (number) if found, otherwise null.
 */
export declare function getVideoProgressFromStorage(courseId: string): number | null;
/**
 * Sets the video progress for a specific course in localStorage.
 * @param courseId - The ID of the course.
 * @param progress - The progress (number) to set.
 */
export declare function setVideoProgressInStorage(courseId: string, progress: number): void;
/**
 * Retrieves all video progress data from localStorage.
 * @returns The entire video progress storage object, or an empty object if not found.
 */
export declare function getAllVideoProgressFromStorage(): VideoProgressStorage;
export {};