/**
 * Observable layout model — single-writer, synchronous, call-ordered.
 *
 * INV-3: mutations assume an already-validated (acyclic, integrity-checked) tree
 * — callers feeding hand-built trees should parseLayout/validateTree first.
 *
 * Conventions (pinned by model.test.ts):
 *  - revision starts at 0 for the initial tree.
 *  - subscribe() does NOT replay; first emission is on the first successful
 *    apply, carrying revision 1.
 *  - +1 per successful apply; a throwing mutation does NOT advance revision and
 *    does NOT notify (the throw propagates to the caller).
 */
import type { LayoutModel, LayoutTree } from './types.js';
export declare function createLayoutModel(initial: LayoutTree): LayoutModel;
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