Refactored many helpers to Typescript

test/utils/helpers/numbers.test.ts

@@ -0,0 +1,20 @@
+import { roundTen } from '../../../src/utils/helpers/numbers';
+
+describe('numbers', () => {
+  describe('roundTen', () => {
+    it('rounds provided number to the next multiple of ten', () => {
+      const expectationsPairs = [
+        [ 10, 10 ],
+        [ 12, 20 ],
+        [ 158, 160 ],
+        [ 5, 10 ],
+        [ -42, -40 ],
+      ];
+
+      expect.assertions(expectationsPairs.length);
+      expectationsPairs.forEach(([ number, expected ]) => {
+        expect(roundTen(number)).toEqual(expected);
+      });
+    });
+  });
+});