# plugin-bundle-size

Helps reduce the module.js entry point in Grafana app plugins using React.lazy, Suspense, and Webpack code splitting.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 4200 installs · ★ 290
- Author: grafana
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/grafana/skills/tree/HEAD/skills/grafana-plugins/plugin-bundle-size/SKILL.md
- Updated: 2026-10-25
- HTML: https://affpapa.org/en/nevibecode/skills/plugin-bundle-size

## What it does

The entry point `module.js` blocks rendering for Grafana app plugins during startup. This skill guides the agent to shrink `module.js` below ~200 KB, targeting a total of 15–25 JavaScript chunks. Generating over 50 chunks is flagged as over-engineering.

Optimisation follows strict risk tiers. Priority goes to lazy wrappers in `module.tsx` and route-level `React.lazy()` calls. Isolating routes alone typically cuts the `module.js` payload by over 95%. The workflow explicitly leaves vendor dependencies like `@grafana/scenes` and `@reduxjs/toolkit` alone because Webpack splits them without manual intervention.

The process applies only to app plugins verified via `src/plugin.json`. Running this splitting sequence on panel or datasource plugins will fail to account for their distinct lifecycle needs.

## Requirements
- Works with: Grafana

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add grafana/skills --skill plugin-bundle-size -a claude-code
```

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

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add grafana/skills --skill plugin-bundle-size -a codex
```

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

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add grafana/skills --skill plugin-bundle-size -a cursor
```

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

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install grafana/skills plugin-bundle-size
```

2. **Manually: put the files in place**
- File: `.github/skills/plugin-bundle-size/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add grafana/skills --skill plugin-bundle-size -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/grafana/skills --path skills/grafana-plugins/plugin-bundle-size
```

### Windsurf (Devin Desktop)

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

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add grafana/skills --skill plugin-bundle-size -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/grafana/skills/tree/HEAD/skills/grafana-plugins/plugin-bundle-size/SKILL.md

## When to use it
- reduce the render-blocking module.js entry point under 200 KB
- implement code splitting for plugin routes with React.lazy and Suspense
- configure GitHub Actions PR bundle size checks using grafana/plugin-actions/bundle-size
- isolate plugin extensions and heavy tabs into independent chunks

## Example prompts
- Optimise plugin bundle size, module.js is too large
- Help me set up code splitting and Suspense for my Grafana app plugin routes
- Check src/module.ts for heavy synchronous imports and isolate them

## Source text · SKILL.md · Apache-2.0

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: 623fc2de6ac90b44.

BEGIN THIRD-PARTY FILE 623fc2de6ac90b44
````text
---
name: plugin-bundle-size
license: Apache-2.0
description:
  Optimise Grafana app plugin bundle size using React.lazy, Suspense, and webpack code splitting.
  Use when the user asks to reduce plugin bundle size, optimise module.js, add code splitting,
  improve initial plugin load performance, split plugin chunks, lazy load plugin pages, or
  help implement lazy loading in a Grafana app plugin. Triggers on phrases like "optimise plugin
  bundle size", "module.js is too large", "plugin is slow to load", "code split the plugin",
  "reduce initial JS payload", or "help me with Suspense in my plugin".
---

# Grafana plugin bundle size optimisation

`module.js` is the render-blocking entry point for every Grafana app plugin. The smaller it is, the less impact the plugin has on Grafana's overall startup time. A well-split plugin should have a `module.js` under ~200 KB that contains nothing but lazy-loaded wrappers — all feature code loads on demand.

**Target:** ~15–25 JS chunks total. Fewer means too little splitting; far more (50+) means over-engineering.

## Risk levels

Not all splitting opportunities carry the same risk. Apply them in this order:

| Level | What | Risk | Impact |
|---|---|---|---|
| **Safe** | `module.tsx` lazy wrappers (Priority 1) | Very low — no behaviour change | Highest — module.js drops 90%+ |
| **Safe** | Route-level `lazy()` (Priority 2) | Low — each route is self-contained | High — one chunk per route |
| **Safe** | Extension `lazy()` (Priority 3) | Low — extensions are isolated | Medium — independent chunk per extension |
| **Moderate** | Component registries / tab panels (Priority 4) | Medium — verify Suspense placement | Medium — splits heavy pages further |
| **Do not touch** | Vendor libraries (`@grafana/scenes`, `@reduxjs/toolkit`) | N/A | N/A — webpack splits these automatically |
| **Do not touch** | Shared utility components (Markdown, Spinner) used across many files | High churn, many callsites | Low — already in shared vendor chunks |

When in doubt, stop after Priority 2. Routes alone typically reduce `module.js` by 95%+.

---

## Step 1: Add bundle size CI reporting (recommended)

Add the `grafana/plugin-actions/bundle-size` action to get automatic bundle size comparison comments on every PR. This posts a table showing entry point size changes, file count diffs, and total bundle impact.

**Root-level plugins** (plugin at repo root):

```yaml
# .github/workflows/bundle-size.yml
name: Bundle Size
on:
  pull_request:
  push:
    branches: [main]
  workflow_dispatch:

jobs:
  bundle-size:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      id-token: write
      pull-requests: write
      actions: read
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
````
END THIRD-PARTY FILE 623fc2de6ac90b44

The third-party file has ended. Everything between the 623fc2de6ac90b44 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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