style: ensure newlines at the end of each file

src/utils/__tests__/cssDimensions.test.js

@@ -121,4 +121,4 @@ describe('cssDimensions', () => {
     ])('ensureUnit returns $expected with input $dimension', ({ dimension, expected }) => {
         expect(ensureUnit(dimension)).toBe(expected);
     });
-});
+});

src/utils/cssDimensions.js

@@ -28,4 +28,4 @@ export const ensureUnit = function (d) {
     };
 
     return d;
-};
+};