Subchapter 3.18

Bundle Conditional

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Conditional Module Loading

Load large data or modules only when a feature is activated.

Example (lazy-load animation frames):

Bundle Conditional · Vercel React Best Practices · vercel-labs/agent-skills · Skills Docs

function AnimationPlayer({ enabled, setEnabled }: { enabled: boolean; setEnabled: React.Dispatch<React.SetStateAction<boolean>> }) {
  const [frames, setFrames] = useState<Frame[] | null>(null)

  useEffect(() => {
    if (enabled && !frames && typeof window !== 'undefined') {
      import('./animation-frames.js')
        .then(mod => setFrames(mod.frames))
        .catch(() => setEnabled(false))
    }
  }, [enabled, frames, setEnabled])

  if (!frames) return <Skeleton />
  return <Canvas frames={frames} />
}