/**
 * useTrackingScript - Dynamically load tracking script based on environment and product line.
 *
 * @param {('sandbox' | 'production')} env - The environment identifier to select the appropriate script URL.
 * @param {('app' | 'portal')} productLine - The product line identifier to select the corresponding script. Default is 'app'.
 */
export declare const useTrackingScript: (env: "sandbox" | "production", productLine?: "app" | "portal") => void;