export interface StorageLike {
    getItem: (key: string) => string | null;
    setItem: (key: string, value: string) => void;
}
export default class ConstantProperties {
    private readonly localStorage;
    private readonly sessionStorage;
    os: string;
    osVersion: string;
    browser: string;
    browserVersion: string;
    platform: string;
    screenHeight: number;
    screenWidth: number;
    initialReferrer: string;
    utmSource: string | null;
    utmMedium: string | null;
    utmCampaign: string | null;
    deviceId: string;
    searchEngine: string | null;
    user_id: string | null;
    constructor(localStorage: StorageLike, sessionStorage: StorageLike);
    get all(): {
        os: string;
        os_version: string;
        browser: string;
        browser_version: string;
        platform: string;
        screen_height: number;
        screen_width: number;
        initial_referrer: string;
        utm_source: string | null;
        utm_medium: string | null;
        utm_campaign: string | null;
        user_id: string | null;
        distinct_id: string;
        sdk_edition: string;
        sdk_version: string;
        timezone: string;
        search_engine: string | null;
    };
    setUserId: (user_id: string | null) => void;
    resetUserId: (hard?: boolean) => void;
    get defaultPropertyKeys(): string[];
    get distinctId(): string;
    private getDistinctDeviceId;
    private getReferrer;
    private parseUTM;
    private getSearchEngine;
    getSuperProperties: () => Record<string, any>;
    saveSuperProperties: (props: Record<string, any>) => void;
    clearSuperProperties: () => void;
}