Rect-related
Rect
interface Rect {
  readonly x: number;
  readonly y: number;
  readonly width: number;
  readonly height: number;
}
SimplifiedRect
interface SimplifiedRect {
  readonly x: number;
  readonly y: number;
  readonly w: number;
  readonly h: number;
}
NestedBoundaryBox
interface NestedBoundaryBox {
  readonly guid: string;
  readonly name: string;
  readonly type: NodeType;
  readonly bbox: SimplifiedRect;
  readonly layers?: NestedBoundaryBox[];
}