/**
 * Pure helpers for nav state derivation.
 *
 * Extracted so the recursive active/expanded logic can be unit-tested
 * without needing to mount Svelte components.
 *
 * No DOM, no Svelte runes, no SvelteKit imports — these are SSR-safe and
 * deterministic given their inputs.
 */
import type { NavItem } from './types.js';
/**
 * Default activeness check for a nav item against a current path.
 *
 * - Exact match → active
 * - `item.exact === true` → only exact match counts
 * - `item.href === '/'` → only matches `currentPath === '/'`; otherwise
 *   the descendant-path fallback would degrade to `startsWith('//')`
 *   and never fire (and we don't want every path counting the root as
 *   active by ancestry).
 * - Otherwise, active when `currentPath` starts with `item.href + '/'`
 *   (the trailing slash avoids `/foo` matching `/foobar`).
 */
export declare function defaultIsActive(item: NavItem, currentPath: string): boolean;
/**
 * True if the item or any descendant is active under `isActive`.
 */
export declare function isItemOrChildActive(item: NavItem, currentPath: string, isActive?: (item: NavItem, currentPath: string) => boolean): boolean;
/**
 * True when an item's children container should render as expanded.
 *
 * Children are expanded when:
 *  - the item has children, AND
 *  - one of its descendants is active, OR `item.defaultExpanded` is set.
 */
export declare function isExpanded(item: NavItem, currentPath: string, isActive?: (item: NavItem, currentPath: string) => boolean): boolean;
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