/**
 * Storage Module
 * Safe storage wrapper with fallbacks for Safari private mode
 * SEC-03 Fix: Added encryption support for PII data
 */
interface StorageWrapper {
    get(key: string, defaultValue?: any): any;
    getString(key: string, defaultValue?: string | null): string | null;
    set(key: string, value: any): boolean;
    remove(key: string): boolean;
    keys(): string[];
    getEncrypted(key: string, defaultValue?: any): Promise<any>;
    setEncrypted(key: string, value: any): Promise<boolean>;
}
declare class SafeStorage implements StorageWrapper {
    private storage;
    private memory;
    private prefix;
    constructor(storage?: Storage);
    get(key: string, defaultValue?: any): any;
    /**
     * Get a value as a RAW string, skipping the JSON.parse that get() applies.
     *
     * FSR-17: get() blindly JSON.parses, so a stored user_id like '12345' comes back as
     * the NUMBER 12345 after reload, and a 16+-digit snowflake id ('1234567890123456789')
     * is silently precision-corrupted (→ 1234567890123456800) — permanent identity
     * fragmentation. Identifiers (dl_user_id, dl_anonymous_id, dl_auto_identified_email)
     * must round-trip as the exact string they were stored as; use this for them.
     */
    getString(key: string, defaultValue?: string | null): string | null;
    set(key: string, value: any): boolean;
    remove(key: string): boolean;
    keys(): string[];
    /**
     * Migrate data from legacy '__dl_dl_*' keys to new 'dl_*' keys
     *
     * This fixes the double-prefix issue from earlier SDK versions.
     * Called automatically during SDK initialization.
     *
     * @returns Number of keys migrated
     */
    migrateFromLegacyPrefix(): number;
    /**
     * Get encrypted value from storage (SEC-03 Fix)
     *
     * @param key - Storage key
     * @param defaultValue - Default value if not found
     * @returns Decrypted value
     */
    getEncrypted(key: string, defaultValue?: any): Promise<any>;
    /**
     * Set encrypted value in storage (SEC-03 Fix)
     *
     * FIXED (SEC-03): Now throws error if encryption fails instead of silent fallback
     *
     * @param key - Storage key
     * @param value - Value to encrypt and store
     * @returns Success boolean
     * @throws Error if encryption is not available or fails
     */
    setEncrypted(key: string, value: any): Promise<boolean>;
}
declare class CookieStorage {
    private domain;
    private maxAge;
    private sameSite;
    private secure;
    constructor(options?: {
        domain?: string | 'auto';
        maxAge?: number;
        sameSite?: 'Strict' | 'Lax' | 'None';
        secure?: boolean | 'auto';
    });
    get(name: string): string | null;
    set(name: string, value: string, days?: number): boolean;
    remove(name: string): boolean;
    /**
     * Auto-detect the best domain for cross-subdomain tracking
     */
    private getAutoDomain;
}
export declare const storage: SafeStorage;
export declare const sessionStorage: SafeStorage;
export { CookieStorage };
export declare const cookies: CookieStorage;
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