/**
 * Generates a unique ID with optional prefix.
 *
 * @param prefix - Optional prefix for the ID.
 * @returns Unique identifier string.
 */
export declare function generateId(prefix?: string): string;
/**
 * Debounces a function call.
 *
 * @param fn - Function to debounce.
 * @param delay - Delay in milliseconds.
 * @returns Debounced function.
 */
export declare function debounce<T extends (...args: unknown[]) => void>(fn: T, delay: number): (...args: Parameters<T>) => void;
/**
 * Throttles a function call.
 *
 * @param fn - Function to throttle.
 * @param limit - Time limit in milliseconds.
 * @returns Throttled function.
 */
export declare function throttle<T extends (...args: unknown[]) => void>(fn: T, limit: number): (...args: Parameters<T>) => void;
/**
 * Clamps a value between min and max.
 *
 * @param value - Value to clamp.
 * @param min - Minimum value.
 * @param max - Maximum value.
 * @returns Clamped value.
 */
export declare function clamp(value: number, min: number, max: number): number;
/**
 * Formats a date string for display.
 *
 * @param dateStr - ISO date string.
 * @returns Formatted date string.
 */
export declare function formatDate(dateStr: string | null | undefined): string;
/**
 * Gets the best available date from STAC item properties.
 * Checks datetime, start_datetime, and end_datetime in order.
 *
 * @param properties - STAC item properties.
 * @returns Date string or null.
 */
export declare function getItemDate(properties: Record<string, unknown>): string | null;
/**
 * Formats a datetime string for display.
 *
 * @param dateStr - ISO datetime string.
 * @returns Formatted datetime string.
 */
export declare function formatDateTime(dateStr: string | null | undefined): string;
/**
 * Truncates a string to a maximum length.
 *
 * @param text - String to truncate.
 * @param maxLength - Maximum length.
 * @returns Truncated string.
 */
export declare function truncate(text: string, maxLength: number): string;
/**
 * Formats a bounding box for display.
 *
 * @param bbox - Bounding box [west, south, east, north].
 * @returns Formatted bbox string.
 */
export declare function formatBbox(bbox: [number, number, number, number]): string;
/**
 * Builds CSS class string from conditions.
 *
 * @param classes - Object mapping class names to boolean conditions.
 * @returns Space-separated class string.
 */
export declare function classNames(classes: Record<string, boolean>): string;
/**
 * Checks if a value is a valid bbox.
 *
 * @param bbox - Value to check.
 * @returns True if valid bbox.
 */
export declare function isValidBbox(bbox: unknown): bbox is [number, number, number, number];
/**
 * Formats file size for display.
 *
 * @param bytes - Size in bytes.
 * @returns Formatted size string.
 */
export declare function formatFileSize(bytes: number): string;
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