export declare class WebMessageManager {
    static initialize(hard?: boolean): Promise<void>;
    static maybeTriggerWebMessagesAndUpdateEventCounts(eventName: string, eventParams: Record<string, any>, externalUserID: string | null, segmentationEventParamKeys?: string[] | null): void;
    private static _triggerWebMessages;
    /**
     * Get campaigns to schedule.
     */
    private static _getCampaignsToSchedule;
    /**
     * Compare function for sorting campaigns by delay in ascending order.
     * If those are equal, sort by updated_at in descending order.
     */
    private static _compareCampaigns;
    /**
     * This function assumes that all campaigns should be scheduled and sorted with _compareCampaigns function.
     * This function removes campaigns that are scheduled to be shown at the same time.
     * When there are multiple campaigns scheduled to be shown at the same time, the one with the latest updated_at will be chosen.
     */
    private static _compactCampaigns;
    /**
     * Check if any scheduled campaigns should be cancelled based on the incoming event.
     */
    private static _checkCancellationConditions;
    /**
     * Functions below are helpers for checking whether a campaign should be scheduled or not.
     */
    private static _isCampaignActive;
    private static _isEventApplicableForCampaign;
    private static _matchTriggeringConditions;
    private static _matchTriggeringConditionUnit;
    private static _matchTriggeringEventFilters;
    private static _matchTriggeringEventFilterUnit;
    private static _isEntityOfSegment;
    private static _matchCondition;
    private static _matchEventBasedCondition;
    private static _matchUserPropertyBasedCondition;
    private static _extractUserAttribute;
    static isEntityOfSegment: typeof WebMessageManager._isEntityOfSegment;
    static isEventApplicableForCampaign: typeof WebMessageManager._isEventApplicableForCampaign;
    static getCampaignsToSchedule: typeof WebMessageManager._getCampaignsToSchedule;
}
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