/**
 * Memory-only key storage for session-based parent-popup communication
 * More secure and performant than localStorage for ephemeral keys
 */
export declare class KeyStorage {
    private data;
    /**
     * Get a stored key value
     */
    get(key: string): string | null;
    /**
     * Set a key value
     */
    set(key: string, value: string | null): void;
    /**
     * Clear all stored keys
     */
    clear(): void;
}
export declare const keyStorage: KeyStorage;
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