/// <reference path="../../../src/manager/tracking/gtm/gtag.d.ts" />
import type TrackingDelegate from '../TrackingDelegate';
/**
 * Google Tag Manager implementation of TrackingDelegate.
 * Uses the global gtag() function from gtag.js.
 *
 * The GTM script should be loaded externally in the HTML:
 * <script async src="https://www.googletagmanager.com/gtag/js?id=G-X"></script>
 *
 * This delegate initializes dataLayer and gtag function following Google's recommendation:
 * - window.dataLayer = window.dataLayer || [];
 * - function gtag(){dataLayer.push(arguments);}
 */
export declare class GTMTrackingDelegate implements TrackingDelegate {
    private gtag;
    constructor();
    init(onInit: () => void): void;
    getInstance(): unknown;
    /**
     * Configures Google Tag Manager with a measurement ID.
     * Maps to: gtag('config', measurementId, params)
     */
    config(measurementId: string, params?: Record<string, any>): void;
    /**
     * Records an event in Google Tag Manager.
     * Maps to: gtag('event', eventName, params)
     */
    event(eventName: string, params?: Record<string, any>): void;
    /**
     * Sets global parameters for all subsequent events.
     * Maps to: gtag('set', params)
     */
    set(params: Record<string, any>): void;
    /**
     * Retrieves a configuration value from Google Tag Manager.
     * Maps to: gtag('get', measurementId, callback)
     */
    get(measurementId: string, callback: (value: any) => void): void;
    /**
     * Manages user consent for data collection.
     * Maps to: gtag('consent', command, params)
     */
    consent(command: string, params?: Record<string, any>): void;
}
export default GTMTrackingDelegate;