1  // Mock browser APIs needed by @statsig/js-client in Node.js environment
 2  
 3  // Document mock with visibility state tracking
 4  const mockDocument = {
 5    visibilityState: 'visible' as const,
 6    documentElement: {
 7      lang: 'en',
 8    },
 9    addEventListener: (
10      _event: string,
11      _handler: EventListenerOrEventListenerObject,
12    ) => {
13      // Visibility change events are handled through window.document reference
14    },
15  } as const
16  
17  // Window mock with focus/blur and beforeunload handling
18  export const mockWindow = {
19    document: mockDocument,
20    location: {
21      href: 'node://localhost',
22      pathname: '/',
23    },
24    addEventListener: (
25      event: string,
26      handler: EventListenerOrEventListenerObject,
27    ) => {
28      if (event === 'beforeunload') {
29        // Capture beforeunload handlers and run them on process exit
30        process.on('exit', () => {
31          if (typeof handler === 'function') {
32            handler({} as Event)
33          } else {
34            handler.handleEvent({} as Event)
35          }
36        })
37      }
38      // Other events (focus/blur) are not critically needed in Node.js
39    },
40    focus: () => {
41      // Focus is a no-op in Node.js
42    },
43    innerHeight: 768,
44    innerWidth: 1024,
45  } as const
46  
47  // Navigator mock with minimal beacon support
48  export const mockNavigator = {
49    sendBeacon: (_url: string, _data: string | Blob): boolean => {
50      // Beacons are used for analytics - return success but don't actually send
51      return true
52    },
53    userAgent:
54      'Mozilla/5.0 (Node.js) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0',
55    language: 'en-US',
56  } as const
57  
58  // Only assign mocks if running in Node.js environment
59  if (typeof window === 'undefined') {
60    // @ts-expect-error: intentionally applying partial mocks for Node.js environment
61    global.window = mockWindow
62  }
63  if (typeof navigator === 'undefined') {
64    // @ts-expect-error: intentionally applying partial mocks for Node.js environment
65    global.navigator = mockNavigator
66  }