Fixed TS declaration for point type

Author: lutovich

test/types/v1/spatial-types.test.ts

@@ -34,13 +34,13 @@ const point3: Point = new Point(int(1), 2, 3, 4);
 const srid3: Integer = point3.srid;
 const x3: number = point3.x;
 const y3: number = point3.y;
-const z3: number = point3.z;
+const z3: number | undefined = point3.z;
 
 const point4: Point<number> = new Point(1, 2, 3, 4);
 const srid4: number = point4.srid;
 const x4: number = point4.x;
 const y4: number = point4.y;
-const z4: number = point4.z;
+const z4: number | undefined = point4.z;
 
 const isPoint1: boolean = isPoint(point1);
-const isPoint2: boolean = isPoint(null);
+const isPoint2: boolean = isPoint({});

types/v1/spatial-types.d.ts

@@ -24,9 +24,9 @@ declare class Point<T extends NumberOrInteger = Integer> {
   srid: T;
   x: number;
   y: number;
-  z: number | undefined;
+  z?: number;
 
-  constructor(srid: T, x: number, y: number, z?: number | undefined)
+  constructor(srid: T, x: number, y: number, z?: number)
 }
 
 declare function isPoint(obj: object): boolean;