---
title: "bundle preload"
description: "Preload heavy bundles before they're needed to reduce perceived latency."
type: skill
canonical_url: https://claudary.paisolsolutions.com/skills/bundle-preload
source: "Claudary"
difficulty: intermediate
author: "Claude Code Knowledge Pack"
date: 2026-07-10T11:08:39.362Z
license: CC-BY-4.0
attribution: "bundle preload — Claudary (https://claudary.paisolsolutions.com/skills/bundle-preload)"
---

# bundle preload
Preload heavy bundles before they're needed to reduce perceived latency.

## Overview

---
title: Preload Based on User Intent
impact: MEDIUM
impactDescription: reduces perceived latency
tags: bundle, preload, user-intent, hover
---

## Preload Based on User Intent

Preload heavy bundles before they're needed to reduce perceived latency.

**Example (preload on hover/focus):**

```tsx
function EditorButton({ onClick }: { onClick: () => void }) {
  const preload = () => {
    if (typeof window !== 'undefined') {
      void import('./monaco-editor')
    }
  }

  return (
    <button
      onMouseEnter={preload}
      onFocus={preload}
      onClick={onClick}
    >
      Open Editor
    </button>
  )
}
```

**Example (preload when feature flag is enabled):**

```tsx
function FlagsProvider({ children, flags }: Props) {
  useEffect(() => {
    if (flags.editorEnabled && typeof window !== 'undefined') {
      void import('./monaco-editor').then(mod => mod.init())
    }
  }, [flags.editorEnabled])

  return <FlagsContext.Provider value={flags}>
    {children}
  </FlagsContext.Provider>
}
```

The `typeof window !== 'undefined'` check prevents bundling preloaded modules for SSR, optimizing server bundle size and build speed.

---

Source: [Claudary](https://claudary.paisolsolutions.com/skills/bundle-preload) · https://claudary.paisolsolutions.com