fix: ensure that closingPoint property exists on closingPoint of free…

…hand mode (#373)

src/modes/freehand/freehand.mode.spec.ts

@@ -142,6 +142,12 @@ describe("TerraDrawFreehandMode", () => {
 					[expect.any(String), expect.any(String)],
 					"create",
 				);
+
+				const features = store.copyAll();
+				expect(features.length).toBe(2);
+				expect(features[0].geometry.type).toBe("Polygon");
+				expect(features[1].geometry.type).toBe("Point");
+				expect(features[1].properties.closingPoint).toBe(true);
 			});
 
 			it("finishes drawing polygon on second click", () => {

src/modes/freehand/freehand.mode.ts

@@ -6,6 +6,7 @@ import {
 	NumericStyling,
 	Cursor,
 	UpdateTypes,
+	POLYGON_PROPERTIES,
 } from "../../common";
 import { Polygon } from "geojson";
 
@@ -258,7 +259,10 @@ export class TerraDrawFreehandMode extends TerraDrawBaseDrawMode<FreehandPolygon
 						type: "Point",
 						coordinates: [event.lng, event.lat],
 					},
-					properties: { mode: this.mode },
+					properties: {
+						mode: this.mode,
+						[POLYGON_PROPERTIES.CLOSING_POINT]: true,
+					},
 				},
 			]);