/**
 * General utilities for @saavn-labs/sdk
 * @module utils
 * @internal
 */
import type { SaavnPermalinkToken } from '../types.js';
export declare function pickUserAgent(custom?: readonly string[]): string;
/**
 * Extract entity type and token from a JioSaavn share URL
 * @param permaLink - JioSaavn share URL or token
 * @returns Extracted token object or undefined if invalid
 */
export declare function extractPermalinkToken(permaLink: string): SaavnPermalinkToken | undefined;