HouYunFei
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51 lines
1.1 KiB
Markdown
51 lines
1.1 KiB
Markdown
---
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title: Preload Based on User Intent
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impact: MEDIUM
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impactDescription: reduces perceived latency
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tags: bundle, preload, user-intent, hover
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---
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## Preload Based on User Intent
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Preload heavy bundles before they're needed to reduce perceived latency.
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**Example (preload on hover/focus):**
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```tsx
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function EditorButton({ onClick }: { onClick: () => void }) {
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const preload = () => {
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if (typeof window !== 'undefined') {
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void import('./monaco-editor')
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}
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}
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return (
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<button
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onMouseEnter={preload}
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onFocus={preload}
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onClick={onClick}
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>
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Open Editor
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</button>
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)
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}
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```
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**Example (preload when feature flag is enabled):**
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```tsx
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function FlagsProvider({ children, flags }: Props) {
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useEffect(() => {
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if (flags.editorEnabled && typeof window !== 'undefined') {
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void import('./monaco-editor').then(mod => mod.init())
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}
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}, [flags.editorEnabled])
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return <FlagsContext.Provider value={flags}>
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{children}
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</FlagsContext.Provider>
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}
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```
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The `typeof window !== 'undefined'` check prevents bundling preloaded modules for SSR, optimizing server bundle size and build speed.
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