/**
 * TransformGraph.ts
 *
 * Transform hierarchy independent of scene graph: manages
 * parent/child transform chains, world matrix caching,
 * dirty flag propagation, and batch updates.
 *
 * @module spatial
 */
/** Object-shaped 3-vector for transform TRS (distinct from tuple `Vector3` in SpatialTypes). */
export interface Vec3 {
    x: number;
    y: number;
    z: number;
}
type TransformInput = Partial<Transform3D> | {
    x?: number;
    y?: number;
    z?: number;
    sx?: number;
    sy?: number;
    sz?: number;
}
/** Local position only; scale defaults to (1,1,1). */
 | readonly [number, number, number];
export interface Transform3D {
    position: Vec3;
    scale: Vec3;
}
export declare class TransformGraph {
    private entries;
    addNode(id: string, local?: TransformInput): void;
    removeNode(id: string): void;
    setParent(childId: string, parentId: string | null): void;
    getChildren(id: string): string[];
    getParent(id: string): string | null;
    setPosition(id: string, x: number, y: number, z: number): void;
    setScale(id: string, sx: number, sy: number, sz: number): void;
    getLocalTransform(id: string): Transform3D | null;
    getWorldPosition(id: string): [number, number, number] | null;
    updateAll(): void;
    private updateWorld;
    private markDirty;
    getNodeCount(): number;
    getRoots(): string[];
}
export {};
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