Fix useOrientation on SSR

src/useOrientation.ts

@@ -12,10 +12,10 @@ const defaultState: OrientationState = {
 };
 
 const useOrientation = (initialState: OrientationState = defaultState) => {
-  const screen = window.screen;
   const [state, setState] = useState(initialState);
 
   useEffect(() => {
+    const screen = window.screen;
     let mounted = true;
 
     const onChange = () => {
@@ -25,7 +25,7 @@ const useOrientation = (initialState: OrientationState = defaultState) => {
         if (orientation) {
           const { angle, type } = orientation;
           setState({ angle, type });
-        } else if (window.orientation) {
+        } else if (window.orientation !== undefined) {
           setState({
             angle: typeof window.orientation === 'number' ? window.orientation : 0,
             type: '',

tests/useOrientation.test.ts

@@ -0,0 +1,87 @@
+import { act, renderHook } from "@testing-library/react-hooks";
+import { replaceRaf } from "raf-stub";
+import useOrientation from "../src/useOrientation";
+
+declare var requestAnimationFrame: {
+  reset: () => void;
+  step: (steps?: number, duration?: number) => void;
+};
+
+describe('useOrientation', () => {
+  beforeAll(() => {
+    replaceRaf();
+  });
+
+  beforeEach(() => {
+    (window.screen.orientation as object) = {
+      type: 'landscape-primary',
+      angle: 0,
+    };
+    (window.orientation as number) = 0;
+  })
+
+  afterEach(() => {
+    requestAnimationFrame.reset();
+  });
+
+  it('should be defined', () => {
+    expect(useOrientation).toBeDefined();
+  });
+
+  function getHook(...args) {
+    return renderHook(() => useOrientation(...args));
+  }
+
+  function triggerOrientation(type: string, angle: number) {
+    (window.screen.orientation.type as string) = type;
+    (window.screen.orientation.angle as number) = angle;
+
+    window.dispatchEvent(new Event('orientationchange'));
+  }
+
+  it('should return current window orientation', () => {
+    const hook = getHook();
+
+    expect(typeof hook.result.current).toBe('object');
+    expect(typeof hook.result.current.type).toBe('string');
+    expect(typeof hook.result.current.angle).toBe('number');
+  });
+
+  it('should use initial values in case of no parameters', () => {
+    const hook = getHook();
+
+    expect(hook.result.current.type).toBe('landscape-primary');
+    expect(hook.result.current.angle).toBe(0);
+  });
+
+  it("should re-render after orientation change on closest RAF", () => {
+    const hook = getHook();
+
+    act(() => {
+      triggerOrientation('portrait-secondary', 180);
+      requestAnimationFrame.step();
+    });
+
+    expect(hook.result.current.type).toBe('portrait-secondary');
+    expect(hook.result.current.angle).toBe(180);
+  });
+
+  it('should return window.orientation number if window.screen.orientation is missing', () => {
+    (window.screen.orientation as unknown) = undefined;
+
+    const hook = getHook();
+
+    expect(hook.result.current.type).toBe('');
+    expect(hook.result.current.angle).toBe(0);
+  });
+
+  it('should return 0 if window.orientation is not a number and if window.screen.orientation is missing', () => {
+    (window.screen.orientation as unknown) = undefined;
+    (window.orientation as unknown) = null;
+
+    const hook = getHook();
+
+    expect(hook.result.current.type).toBe('');
+    expect(hook.result.current.angle).toBe(0);
+  })
+});