/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
export declare function parseUserAgent(userAgent: string): string;
/**
 * Runs the given callback within a context that has the specified client label.
 * All LLM calls made within this callback will include the client label in their tracking headers.
 *
 * @param clientLabel The custom client label to apply.
 * @param callback The callback function to execute.
 * @return The result of the callback.
 */
export declare function runWithClientLabel<R>(clientLabel: string, callback: () => R): R;
/**
 * Returns the current list of client labels that can be added to HTTP Headers.
 */
export declare function getClientLabels(): string[];