message: added translate and union
diff: declare namespace jscad {
  class CxG {
  + translate(v: number[]): this;
  }
  class CSG extends CxG {
  polygons: CSG.Polygon[];
  toCompactBinary(): any;
  + union(csg: CSG[]): CSG;
  + union(csg: CSG): CSG;
  }
  namespace CSG {
  