/**
 * Event utilities
 * Functions for extracting event properties, campaign parameters, and person info
 */
export declare const PERSONAL_DATA_CAMPAIGN_PARAMS: string[];
export declare const CAMPAIGN_PARAMS: string[];
export declare const EVENT_TO_PERSON_PROPERTIES: string[];
export declare const MASKED = "<masked>";
export declare const COOKIE_CAMPAIGN_PARAMS: string[];
/**
 * Get campaign parameters from URL
 * Extracts UTM and other campaign tracking parameters from current page URL
 * Masks personal data parameters if configured
 */
export declare function getCampaignParams(customTrackedParams?: string[], maskPersonalDataProperties?: boolean, customPersonalDataProperties?: string[] | undefined): Record<string, string>;
export declare function getBrowserLanguage(): string | undefined;
export declare function getBrowserLanguagePrefix(): string | undefined;
export declare function getReferrer(): string;
export declare function getReferringDomain(): string;
/**
 * Get person info for initial storage
 * Extracts referrer and URL info, masks personal data if configured
 * Returns compact format (r: referrer, u: url) for storage efficiency
 */
export declare function getPersonInfo(maskPersonalDataProperties?: boolean, customPersonalDataProperties?: string[]): {
    r: string;
    u: string | undefined;
};
export declare function getTimezone(): string | undefined;
export declare function getTimezoneOffset(): number | undefined;
/**
 * Get event properties that should be added to all events
 * Returns all event context properties (browser, device, URL, etc.) plus event metadata
 * Note: Only properties in EVENT_TO_PERSON_PROPERTIES are copied to person properties
 */
export declare function getEventProperties(maskPersonalDataProperties?: boolean, customPersonalDataProperties?: string[]): Record<string, any>;