/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/** Resets the warned-once registry. Test-only. */
export declare function resetDeprecationWarnings(): void;
type Constructor = new (...args: any[]) => any;
/**
 * Marks a class as deprecated, logging `reason` once the first time it is
 * instantiated.
 *
 * The JSDoc `@deprecated` tag is what a reader and an editor see; this is what
 * someone running the code sees, so a deprecation is not silent to a caller who
 * never opens the source. Mirrors `typing_extensions.deprecated`, which
 * adk-python applies to the same classes, and follows the shape of
 * {@link experimental}: one warning per class, not per instance, so a hot loop
 * does not turn into a wall of logs.
 */
export declare function deprecated(reason: string): <T extends Constructor>(target: T) => T;
export {};