/**
 * Read-only tree queries — the single authority for locating nodes/panels in a
 * layout tree. PURE TS (types only): the mutation layer and the react renderer
 * both consume these so the same traversal is never re-implemented per caller.
 */
import type { LayoutNode, TabGroupNode } from './types.js';
/** The tab-group node with `groupId`, or null. */
export declare function findGroupById(root: LayoutNode, groupId: string): TabGroupNode | null;
/** The tab-group node that holds `panelId`, or null. */
export declare function findGroupContaining(root: LayoutNode, panelId: string): TabGroupNode | null;
/** The id of the tab group currently holding `panelId`, or `undefined` if the
 * panel is not in the tree. Used to detect a drop back into the dragged panel's
 * own group and to guard a vanished split anchor. */
export declare function findPanelGroupId(root: LayoutNode, panelId: string): string | undefined;
/** Total panels anywhere in the tree. Drives last-panel close suppression: a
 * group view knows only its own node, so the caller computes this global count. */
export declare function countPanels(node: LayoutNode): number;
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