# dynamic-import

Teaches coding agents on-demand module loading with dynamic import(). It helps cut initial bundle sizes by deferring non-critical components.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1500 installs · ★ 257
- Author: patterns.dev
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/PatternsDev/skills/tree/HEAD/javascript/dynamic-import/SKILL.md
- Updated: 2026-04-15
- HTML: https://affpapa.org/en/nevibecode/skills/dynamic-import

## What it does

The skill configures coding agents to apply `import()` in `**/*.js` and `**/*.ts` files. It guides the model to split pickers, modals, or heavy packages into dedicated chunks instead of including them in the initial bundle. For React applications, it enforces `React.lazy` alongside `React.Suspense` with an explicit fallback component.

In the Patterns.dev chat reference, deferring `EmojiPicker` shaved bundle size down from 1.5MiB to 1.33 MiB. The skill clearly flags an SSR limitation: because React Suspense does not support server-side rendering, you must reach for `loadable-components` instead. Only modules non-essential to the initial render should be split off.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add PatternsDev/skills --skill dynamic-import -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/dynamic-import/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/dynamic-import/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add PatternsDev/skills --skill dynamic-import -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/dynamic-import/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add PatternsDev/skills --skill dynamic-import -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/dynamic-import/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install PatternsDev/skills dynamic-import
```

2. **Manually: put the files in place**
- File: `.github/skills/dynamic-import/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add PatternsDev/skills --skill dynamic-import -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/PatternsDev/skills --path javascript/dynamic-import
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/dynamic-import/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add PatternsDev/skills --skill dynamic-import -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/PatternsDev/skills/tree/HEAD/javascript/dynamic-import/SKILL.md

## When to use it
- reduce initial bundle size by splitting off non-critical code
- configure React.lazy and Suspense for interactive UI pickers and modals
- set up loadable-components for dynamic imports in SSR environments
- provide fallback UI states while deferred modules download

## Example prompts
- Refactor EmojiPicker import to use React.lazy and Suspense to lighten the main bundle
- Help me set up dynamic imports in an SSR React app using loadable-components
- Split this modal into a separate chunk using dynamic import()

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 8c92b2561e18e4a2.

BEGIN THIRD-PARTY FILE 8c92b2561e18e4a2
````text
---
name: dynamic-import
description: Teaches dynamic import() for on-demand code loading. Use when you need to reduce initial bundle size by lazily loading modules that aren't required at startup.
paths:
  - "**/*.js"
  - "**/*.ts"
license: MIT
metadata:
  author: patterns.dev
  version: "1.1"
related_skills:
  - "module-pattern"
  - "singleton-pattern"
---

# Dynamic Import

In a chat application, we have four key components: `UserInfo`, `ChatList`, `ChatInput` and `EmojiPicker`. However, only _three_ of these components are used instantly on the initial page load: `UserInfo`, `ChatList` and `ChatInput`. The `EmojiPicker` isn't directly visible, and may not even be rendered at all if the user won't even click on the `Emoji` in order to toggle the `EmojiPicker`. This would mean that we unnecessarily added the `EmojiPicker` module to our initial bundle, which potentially increased the loading time!

In order to solve this, we can _dynamically import_ the `EmojiPicker` component. Instead of statically importing it, we'll only import it when we want to show the `EmojiPicker`. An easy way to dynamically import components in React is by using **React Suspense**. The `React.Suspense` component receives the component that should be dynamically loaded, which makes it possible for the `App` component to render its contents faster by suspending the import of the `EmojiPicker` module!

## When to Use

- Use this when certain modules are only needed based on user interaction or conditions
- This is helpful when you want to reduce the initial bundle size for faster page loads
- Use this when components like modals, pickers, or heavy libraries aren't needed on initial render

## Instructions

- Use `React.lazy` with `Suspense` for dynamic component imports in React
- Provide meaningful fallback UI while dynamically imported modules are loading
- Consider using `loadable-components` for SSR applications where React Suspense isn't supported
- Only dynamically import modules that aren't critical to the initial render

## Details

Instead of unnecessarily adding `EmojiPicker` to the initial bundle, we can split it up into its own bundle and reduce the size of the initial bundle!

A smaller initial bundle size means a faster initial load: the user doesn't have to stare at a blank loading screen for as long. The `fallback` component lets the user know that our application hasn't frozen: they simply need to wait a little while for the module to be processed and executed.

```
Asset                             Size         Chunks            Chunk Names
emoji-picker.bundle.js           1.48 KiB      1    [emitted]    emoji-picker
main.bundle.js                   1.33 MiB      main [emitted]    main
vendors~emoji-picker.bundle.js   171 KiB       2    [emitted]    vendors~emoji-picker
```

Whereas previously the initial bundle was `1.5MiB`, we've been able to reduce it to `1.33 MiB` by suspending the import of the `EmojiPicker`!
````
END THIRD-PARTY FILE 8c92b2561e18e4a2

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