Cursor rule

1---
2alwaysApply: false
3---
4 
5## Preload Based on User Intent
6 
7Preload heavy bundles before they're needed to reduce perceived latency.
8 
9**Example (preload on hover/focus):**
10 
11```tsx
12function EditorButton({ onClick }: { onClick: () => void }) {
13  const preload = () => {
14    if (typeof window !== 'undefined') {
15      void import('./monaco-editor')
16    }
17  }
18 
19  return (
20    <button
21      onMouseEnter={preload}
22      onFocus={preload}
23      onClick={onClick}
24    >
25      Open Editor
26    </button>
27  )
28}
29```
30 
31**Example (preload when feature flag is enabled):**
32 
33```tsx
34function FlagsProvider({ children, flags }: Props) {
35  useEffect(() => {
36    if (flags.editorEnabled && typeof window !== 'undefined') {
37      void import('./monaco-editor').then(mod => mod.init())
38    }
39  }, [flags.editorEnabled])
40 
41  return <FlagsContext.Provider value={flags}>
42    {children}
43  </FlagsContext.Provider>
44}
45```
46 
47The `typeof window !== 'undefined'` check prevents bundling preloaded modules for SSR, optimizing server bundle size and build speed.
48