/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
export declare enum ReleaseChannel {
    NIGHTLY = "nightly",
    PREVIEW = "preview",
    STABLE = "stable"
}
/**
 * Clears the cache for testing purposes.
 * @private
 */
export declare function _clearCache(): void;
export declare function isNightly(cwd: string): Promise<boolean>;
export declare function isPreview(cwd: string): Promise<boolean>;
export declare function isStable(cwd: string): Promise<boolean>;