import type { RiveArtboardGraph, RiveSkeleton2DImport } from '@flighthq/types/contract';
/**
 * Flattens an artboard's bones into a `Skeleton2D`.
 *
 * Rive keeps bones in the artboard's own component tree as `TransformComponent`s — siblings of `Node`
 * rather than nodes themselves — while `Skeleton2D` owns a flat, **parent-before-child** array and
 * propagates world transforms itself. The bridge is a topological sort, and it is well-founded rather
 * than a graph problem: every stated parent resolves and the tree holds no cycle, so ordering bones by
 * their depth in that tree already guarantees a parent precedes its children. Ties keep stream order,
 * so the result is stable for a given file.
 *
 * Returns `null` when the artboard has no bones, which is most of them — a caller pays for a skeleton
 * only when the file actually rigs something.
 */
export declare function createRiveSkeleton2D(artboard: Readonly<RiveArtboardGraph>): RiveSkeleton2DImport | null;
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