/**
 * Detect if the application is running in SPA mode (client-side only, no SSR)
 *
 * In SPA mode:
 * - Server loaders are not available
 * - Cookies cannot be set via server response
 * - localStorage is the primary storage mechanism
 *
 * In SSR mode:
 * - Server loaders are available
 * - Cookies can be set via server response
 * - Cookies are the primary storage mechanism (server can read them)
 *
 * @returns true if running in SPA mode, false if SSR mode
 */
export declare function isSpaMode(): boolean;
/**
 * Get the current storage mode description for debugging
 * @returns 'spa' | 'ssr'
 */
export declare function getStorageMode(): 'spa' | 'ssr';
/**
 * Settings storage utility for persisting UI settings
 * Uses localStorage for SPA mode persistence
 */
export declare const settingsStorage: {
    /**
     * Get settings deltas from localStorage
     * @returns Parsed deltas or null
     */
    get: () => any | null;
    /**
     * Save settings deltas to localStorage
     * @param deltas - Deltas to store
     */
    set: (deltas: any) => void;
    /**
     * Merge new deltas with existing deltas
     * @param newDeltas - New deltas to merge
     * @returns Merged deltas
     */
    merge: (newDeltas: any) => any;
    /**
     * Clear all deltas from localStorage
     */
    clear: () => void;
    /**
     * Check if localStorage is available
     * @returns true if available
     */
    isAvailable: () => boolean;
};
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