enable-analytics

Add Vercel Analytics, Vercel Speed Insights, and Google Tag Manager to the storefront.

Enable Analytics

The current storefront includes support for Vercel Web Analytics and Vercel Speed Insights, with each integration disabled by default in shop.config.ts. This skill enables or adds those integrations and can also add Google Tag Manager using the recommended integration.

Before you start

Ask the user two questions in order:

1. Do you need to add or change Vercel Analytics and/or Vercel Speed Insights?

Enable both — page views, custom events, and Core Web Vitals
Analytics only — page view and custom event tracking via @vercel/analytics
Speed Insights only — Core Web Vitals monitoring via @vercel/speed-insights
Neither — keep both integrations disabled

2. Do you want Google Tag Manager?

If yes, ask for the GTM container ID (e.g. GTM-XXXXXX). This will be stored in the NEXT_PUBLIC_GTM_ID environment variable.

Wait for the user to answer both questions before proceeding.

Part A: Vercel Analytics and Speed Insights

If the storefront has analytics configuration in shop.config.ts, enable only the selected integrations. If the user selected neither, keep both integration gates disabled and skip the remaining steps in this section.

analytics: {
  speedInsights: { enabled: false },
  vercel: { enabled: false },
},

A1. Install dependencies

For older storefronts without the integrations, install only the packages the user selected:

# Both
pnpm add @vercel/analytics @vercel/speed-insights

# Analytics only
pnpm add @vercel/analytics

# Speed Insights only
pnpm add @vercel/speed-insights

For older storefronts, create or update the root analytics component described below. Each library handles its own client-side behavior internally.

Part B: Google Tag Manager

Skip this section if the user did not want GTM.

B1. Install dependency

pnpm add @next/third-parties

B2. Add environment variable

Add to .env.example:

# Google Tag Manager (optional)
NEXT_PUBLIC_GTM_ID="GTM-XXXXXX"

Set the actual value in .env.local or in the Vercel dashboard under Environment Variables.

B3. Add GTM to `components/analytics.tsx`

Import GoogleTagManager from @next/third-parties/google. Read NEXT_PUBLIC_GTM_ID in the analytics component and render <GoogleTagManager gtmId={gtmId} /> only when the value exists. If the storefront extends shop.config.ts with a GTM integration gate, apply that gate inside the same component.

Part C: Root analytics integration

C1. Create or update `components/analytics.tsx`

Compose the selected providers in the root analytics component and apply each integration gate there:

import { GoogleTagManager } from "@next/third-parties/google";
import { Analytics } from "@vercel/analytics/next";
import { SpeedInsights } from "@vercel/speed-insights/next";

import { shopConfig } from "@/shop.config";

export function AnalyticsComponents() {
  const gtmId = process.env.NEXT_PUBLIC_GTM_ID;

  return (
    <>
      {shopConfig.analytics.vercel.enabled ? <Analytics /> : null}
      {shopConfig.analytics.speedInsights.enabled ? <SpeedInsights /> : null}
      {gtmId ? <GoogleTagManager gtmId={gtmId} /> : null}
    </>
  );
}

Remove imports for integrations the storefront does not support.

C2. Update `app/layout.tsx`

Always render the root analytics component inside <body> after the </NextIntlClientProvider> closing tag:

import { AnalyticsComponents } from "@/components/analytics";

<body ...>
  <a href="#main-content" ...>...</a>
  <SiteSchema locale={locale} />
  <NextIntlClientProvider locale={locale} messages={messages}>
    {/* ... existing layout content ... */}
  </NextIntlClientProvider>
  <AnalyticsComponents />
</body>

The root component remains mounted as the extension point for current and future analytics providers. Provider gates stay inside it so disabled integrations are not mounted.

Guardrails

Keep root analytics providers and their gates in components/analytics.tsx.
Always mount <AnalyticsComponents /> from the root layout, even when every provider is disabled.
The GTM container ID must come from NEXT_PUBLIC_GTM_ID, never hardcoded. The provider renders nothing if the env var is missing.
Use @next/third-parties/google for GTM, not a manual <script> tag. The Next.js component handles script loading and performance optimization.
Import paths: use @vercel/analytics/next and @vercel/speed-insights/next (the /next subpath), not the root package exports.
Add NEXT_PUBLIC_GTM_ID to .env.example with a placeholder value so other developers know the variable exists.