fix(modeling): created TS definitions for splitPolygonByPlane

packages/modeling/src/operations/booleans/trees/splitPolygonByPlane.d.ts

@@ -0,0 +1,33 @@
+import { Poly3 } from '../../../geometries/types';
+import { Plane } from '../../../maths/types';
+
+enum ResType
+{
+    coplanar_front = 0,
+    coplanar_back = 1,
+    front = 2,
+    back = 3,
+    spanning = 4,
+}
+
+
+interface SplitRes
+{
+    type: ResType,
+    front: Poly3,
+    back: Poly3;
+}
+
+// Returns object:
+// .type:
+//   0: coplanar-front
+//   1: coplanar-back
+//   2: front
+//   3: back
+//   4: spanning
+// In case the polygon is spanning, returns:
+// .front: a Polygon3 of the front part
+// .back: a Polygon3 of the back part
+declare function splitPolygonByPlane(plane: Plane, polygon: Poly3): SplitRes;
+
+export default splitPolygonByPlane;