Some code cleanup, add jest coverage and begin using it for utility functions

resources/scripts/lib/objects.spec.ts

@@ -0,0 +1,30 @@
+import { isObject } from '@/lib/objects';
+
+describe('@/lib/objects.ts', function () {
+    describe('isObject()', function () {
+        it('should return true for objects', function () {
+            expect(isObject({})).toBe(true);
+            expect(isObject({ foo: 123 })).toBe(true);
+            expect(isObject(Object.freeze({}))).toBe(true);
+        });
+
+        it('should return false for null', function () {
+            expect(isObject(null)).toBe(false);
+        });
+
+        it.each([
+            undefined,
+            123,
+            'foobar',
+            () => ({}),
+            Function,
+            String(123),
+            isObject,
+            () => null,
+            [],
+            [ 1, 2, 3 ],
+        ])('should return false for %p', function (value) {
+            expect(isObject(value)).toBe(false);
+        });
+    });
+});