/**
 * Custom hook for managing collapsed/expanded state of navigation groups
 * with localStorage persistence. Automatically cleans up stale group entries
 * when groups are removed from the navigation.
 *
 * Groups that have never been toggled by the user fall back to
 * `defaults[groupName]` (driven by `collapsedByDefault` in config).
 *
 * @param groupNames - Array of group names to track
 * @param namespace - Namespace for localStorage key (e.g., "home", "drawer") to allow independent state
 * @param defaults - Optional map of group name → collapsed boolean from config
 */
export declare function useCollapsedGroups(groupNames: string[], namespace?: string, defaults?: Record<string, boolean>): {
    isGroupCollapsed: (name: string) => boolean;
    toggleGroupCollapsed: (name: string) => void;
};
/**
 * Build a defaults map from navigationGroupMappings for a given namespace.
 * Returns a Record<groupName, collapsed> that can be passed to useCollapsedGroups.
 */
export declare function buildCollapsedDefaults(mappings: Array<{
    name: string;
    collapsedByDefault?: boolean | {
        drawer?: boolean;
        home?: boolean;
    };
}> | undefined, namespace: "drawer" | "home"): Record<string, boolean>;