export interface CampaignOptions {
    /**
     * An access token that allows access to the Campaign API for the current user.
     */
    accessToken: string;
    /**
     * Optionally set a different REST API endpoint that should be used by this library.
     */
    campaignApiEndpoint?: string;
}
export interface Notification {
    title: string | null;
    body: string | null;
}
export type WifiConfigType = 'SURFTIME' | 'TIMESPAN';
export interface Campaign {
    campaignUrl: string;
    required: boolean;
    notification: Notification;
    timeUntilNextCampaignToWatch: number;
    /**
     * Type of wifi mode
     * If TIMESPAN -> Campaigns will be required to watch each time after defined time period to prolong access to wifi (for instance every 5 mins)
     * If SURFTIME -> Campaigns will be sent depending on connection session (eg 5 mins set -> after connection to access point session started and tracking
     * -> if user stop connection or leaving access point and used 3 mins from 5 -> timer stop tracking/campaign not required to watch -> next time user connecting
     * to the access point -> timer continue track time and sending campaign to prolong access to wifi after last 2 mins of limit will be reached)
     */
    type: WifiConfigType;
}
export interface CampaignService {
    /**
     * Get the next campaign that should be shown to the user.
     * @param deviceId A string that uniquely identifies this device.
     * @returns A promise that resolves to a `Campaign` object if the
     * campaign was fetched successfully. Rejects if fetching the next
     * campaign failed for any reason.
     * The `Campaign` object contains a flag `Campaign.required` that will
     * be `true` if the user needs to watch a campaign. This will be the case
     * if the timespan since watching the last campaign is greater than the
     * configured timespan. If `Campaign.required` is `false` then it is not
     * necessary to watch a campaign.
     */
    getNextCampaign(deviceId: string): Promise<Campaign>;
    /**
     * Method for checking when campaign view should be closed
     * @param campaignUrl A string to campaign
     */
    shouldCloseCampaignView(campaignUrl: string): boolean;
}
export declare class CampaignServiceImpl implements CampaignService {
    private readonly options;
    constructor(campaignOptions: CampaignOptions);
    getNextCampaign(deviceId: string): Promise<Campaign>;
    shouldCloseCampaignView(campaignUrl: string): boolean;
    private mergeWithDefaultOptions;
    private throwIfInvalidOptions;
}