/// <reference types="google.analytics" />
import { Identity, Page, TrackedEvent, Tracker } from 'crosslytics';
export declare class GoogleAnalyticsTracker implements Tracker {
    id: string;
    static SAMPLE_SIZE: number;
    /**
     * Initialize the overall ga() command queue. Equivalent to pasting
     * the Google Analytics snippet into your markup.
     * @param window context
     * @see {@link https://developers.google.com/analytics/devguides/collection/analyticsjs/}
     */
    static initialize(window: Window): void;
    persistentParams: UniversalAnalytics.FieldsObject;
    /**
     * Store reference to window rather than window.ga since GA snippet
     * overwrites the window reference.
     */
    protected w: Window;
    constructor(id: string, w?: Window);
    identify(identity: Identity): void;
    track<T>(event: TrackedEvent<T>): Promise<void>;
    page(page: Page): Promise<void>;
}