add-analytics

---
name: add-analytics
description: Add Google Analytics 4 tracking to any project. Detects framework, adds tracking code, sets up events, and configures privacy settings.
argument-hint: "<measurement-id> [--events] [--consent] [--debug]"
---

# Google Analytics 4 Setup Skill

You are setting up Google Analytics 4 (GA4) for a project. Follow this comprehensive guide to add analytics properly.

## Arguments

Parse the following from `$ARGUMENTS`:
- **Measurement ID**: Format `G-XXXXXXXXXX` (required, ask if not provided)
- **--events**: Include custom event tracking helpers
- **--consent**: Include cookie consent integration
- **--debug**: Enable debug mode for development

## Step 1: Detect Project Type

Scan the project to determine the framework/setup:

```
Priority detection order:
1. next.config.js/ts → Next.js
2. nuxt.config.js/ts → Nuxt.js
3. astro.config.mjs → Astro
4. svelte.config.js → SvelteKit
5. remix.config.js → Remix
6. gatsby-config.js → Gatsby
7. vite.config.js + src/App.vue → Vue + Vite
8. vite.config.js + src/App.tsx → React + Vite
9. angular.json → Angular
10. package.json with "react-scripts" → Create React App
11. index.html only → Plain HTML
12. _app.tsx/jsx → Next.js (App Router check: app/ directory)
```

Also check for:
- TypeScript usage (tsconfig.json)
- Existing analytics (search for gtag, GA, analytics)
- Package manager (pnpm-lock.yaml, yarn.lock, package-lock.json)

## Step 2: Validate Measurement ID

The Measurement ID must:
- Start with `G-` (GA4 format)
- Be followed by exactly 10 alphanumeric characters
- Example: `G-ABC1234567`

If the user provides a `UA-` ID, inform them:
> "You provided a Universal Analytics ID (UA-). GA4 uses Measurement IDs starting with 'G-'.
> Universal Analytics was sunset in July 2024. You'll need to create a GA4 property at analytics.google.com"

## Step 3: Implementation by Framework

### Next.js (App Router - app/ directory)

Create `app/layout.tsx` modification or create `components/GoogleAnalytics.t