/**
 * GTM API v2 client factory.
 * Wraps the googleapis tagmanager v2 client with sensible defaults.
 */
import { tagmanager_v2 } from 'googleapis/build/src/apis/tagmanager/index.js';
import type { OAuth2Client } from 'google-auth-library';
export type GtmClient = tagmanager_v2.Tagmanager;
export declare function getGtmClient(auth: OAuth2Client): GtmClient;
/** Reset cached clients (useful in tests) */
export declare function resetGtmClient(): void;
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