/**
 * Alphabet letters used to name import subdirectories (a, b, c...).
 */
export declare const ALPHABET: string[];
/**
 * Expands a leading tilde (~) in a path to the user's home directory.
 * Handles both `~` alone and `~/...` prefixes.
 */
export declare function expandTilde(filePath: string): string;
/**
 * Formats a Date as a path segment in the form `YYYY/MM/DD`.
 * Uses local time (not UTC) to match the camera/device timezone.
 */
export declare function formatDatePath(date: Date): string;
/**
 * Returns the Unix timestamp in seconds for a given Date.
 */
export declare function toUnixSeconds(date: Date): number;