/**
 * URL to Base64 Conversion Utility
 *
 * Functions to convert URLs to base64 encoded strings.
 */
/**
 * Convert a URL to base64 encoded string
 *
 * @param url - The URL to fetch and convert
 * @returns Promise<string> - Base64 encoded string
 * @throws Error if the URL cannot be fetched or converted
 */
declare function convertUrlToBase64(url: string): Promise<string>;
/**
 * Convert a URL to base64 data URI format
 *
 * @param url - The URL to fetch and convert
 * @param mimeType - Optional MIME type (will try to detect from response if not provided)
 * @returns Promise<string> - Base64 data URI string (e.g., "data:image/png;base64,iVBORw0KGgo...")
 * @throws Error if the URL cannot be fetched or converted
 */
declare function convertUrlToBase64DataUri(url: string, mimeType?: string): Promise<string>;
/**
 * Convert multiple URLs to base64 strings
 *
 * @param urls - Array of URLs to convert
 * @returns Promise<string[]> - Array of base64 encoded strings
 * @throws Error if any URL cannot be fetched or converted
 */
declare function convertUrlsToBase64(urls: string[]): Promise<string[]>;
/**
 * Convert multiple URLs to base64 data URIs
 *
 * @param urls - Array of URLs to convert
 * @param mimeTypes - Optional array of MIME types (will try to detect if not provided)
 * @returns Promise<string[]> - Array of base64 data URI strings
 * @throws Error if any URL cannot be fetched or converted
 */
declare function convertUrlsToBase64DataUris(urls: string[], mimeTypes?: (string | undefined)[]): Promise<string[]>;
/**
 * Check if a string is a valid URL
 *
 * @param url - The string to check
 * @returns boolean - True if the string is a valid URL
 */
declare function isValidUrl(url: string): boolean;
/**
 * Convert a URL to base64 with timeout
 *
 * @param url - The URL to fetch and convert
 * @param timeoutMs - Timeout in milliseconds (default: 10000)
 * @returns Promise<string> - Base64 encoded string
 * @throws Error if the URL cannot be fetched within timeout or converted
 */
declare function convertUrlToBase64WithTimeout(url: string, timeoutMs?: number): Promise<string>;

export { convertUrlToBase64, convertUrlToBase64DataUri, convertUrlToBase64WithTimeout, convertUrlsToBase64, convertUrlsToBase64DataUris, isValidUrl };