HouYunFei
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- 添加 sections 定义文件，包含性能优化各领域分类 - 添加规则模板文件，规范文档结构和标签定义 - 添加异步操作优化规则，包括防止瀑布流、并行化、延迟等待等 - 添加包大小优化规则，包括避免桶式导入、动态导入、预加载等 - 添加服务端性能优化规则，包括 API 路
32 lines
949 B
Markdown
32 lines
949 B
Markdown
---
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title: Conditional Module Loading
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impact: HIGH
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impactDescription: loads large data only when needed
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tags: bundle, conditional-loading, lazy-loading
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---
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## Conditional Module Loading
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Load large data or modules only when a feature is activated.
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**Example (lazy-load animation frames):**
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```tsx
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function AnimationPlayer({ enabled, setEnabled }: { enabled: boolean; setEnabled: React.Dispatch<React.SetStateAction<boolean>> }) {
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const [frames, setFrames] = useState<Frame[] | null>(null)
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useEffect(() => {
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if (enabled && !frames && typeof window !== 'undefined') {
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import('./animation-frames.js')
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.then(mod => setFrames(mod.frames))
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.catch(() => setEnabled(false))
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}
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}, [enabled, frames, setEnabled])
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if (!frames) return <Skeleton />
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return <Canvas frames={frames} />
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}
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```
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The `typeof window !== 'undefined'` check prevents bundling this module for SSR, optimizing server bundle size and build speed.
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