import { VOUCH_EMBED_TYPE } from '../../constants';
import type { EmbedVouch, VouchEmbedGTMEvent } from '../../types';
import { Environment } from '../environment';
import { UseFetchReturn } from './useFetch';
export declare const API: string;
export declare const DEFAULT_HEADERS: {
    'Content-Type': string;
    'x-gtm-server-preview': string;
};
export type Payload = {
    vouch?: EmbedVouch;
    events: Array<VouchEmbedGTMEvent>;
};
export type WatchPayload = {
    env?: Environment;
    hashId: string;
    apiKey: string;
    ordinality: number;
    embedType: keyof typeof VOUCH_EMBED_TYPE;
};
interface UseTrackReturn extends Omit<UseFetchReturn<unknown>, 'refetch'> {
    track: (payload: Payload) => void;
    trackOnce: (payload: Payload) => void;
    trackWatch: (payload: WatchPayload) => void;
}
export declare function getRequestBody({ vouch, ...payload }: Payload): BodyInit | undefined;
/**
 * Google Tag Manager (GTM) hook
 *
 * @returns GraphQL-alike `loading`, `error`, `data` and `track` function to trigger fetch
 */
export default function (): UseTrackReturn;
export {};