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vercel/shop/enable-analytics

Derive NEXT_PUBLIC_AUTH_ENABLED at build time; expose isAuthEnabled from lib/auth (#200)

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PublishedApril 26, 2026 at 11:22 PM

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version: "1.0.2" name: enable-analytics description: Add Vercel Analytics, Vercel Speed Insights, and Google Tag Manager to the storefront.

Enable Analytics

By default, the storefront has no analytics or performance monitoring. This skill adds Vercel Analytics, Vercel Speed Insights, and/or Google Tag Manager using their recommended integrations.

Before you start

Ask the user two questions in order:

1. Do you want Vercel Analytics and/or Vercel Speed Insights?

Vercel Analytics — page view and custom event tracking via @vercel/analytics
Vercel Speed Insights — Core Web Vitals monitoring via @vercel/speed-insights
Both (recommended)
Neither

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

Skip this section if the user selected neither.

A1. Install dependencies

Install only the packages the user selected:

bash

# Both (recommended)
pnpm add @vercel/analytics @vercel/speed-insights
 
# Analytics only
pnpm add @vercel/analytics
 
# Speed Insights only
pnpm add @vercel/speed-insights

A2. Create `components/analytics.tsx`

Create a component that renders the selected analytics components. Each library handles its own client-side behavior internally, so this can be a server component:

tsx

import { Analytics } from "@vercel/analytics/next";
import { SpeedInsights } from "@vercel/speed-insights/next";
export function AnalyticsComponents() {
  return (
    <>
      <Analytics />
      <SpeedInsights />
    </>
  );
}

If only one was selected, remove the other import and component.

Part B: Google Tag Manager

Skip this section if the user did not want GTM.

B1. Install dependency

bash

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`

If the file was already created in Part A, add GTM to it. If Part A was skipped, create the file now.

With both Vercel Analytics and GTM:

tsx

import { GoogleTagManager } from "@next/third-parties/google";
import { Analytics } from "@vercel/analytics/next";
import { SpeedInsights } from "@vercel/speed-insights/next";
export function AnalyticsComponents() {
  const gtmId = process.env.NEXT_PUBLIC_GTM_ID;
  return (
    <>
      <Analytics />
      <SpeedInsights />
      {gtmId ? <GoogleTagManager gtmId={gtmId} /> : null}
    </>
  );
}

With GTM only (no Vercel Analytics or Speed Insights):

tsx

import { GoogleTagManager } from "@next/third-parties/google";
export function AnalyticsComponents() {
  const gtmId = process.env.NEXT_PUBLIC_GTM_ID;
  if (!gtmId) return null;
  return <GoogleTagManager gtmId={gtmId} />;
}

Part C: Root layout integration

C1. Update `app/layout.tsx`

Import the component and render it inside <body>, after the </NextIntlClientProvider> closing tag:

tsx

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

tsx

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

Place <AnalyticsComponents /> as a sibling after NextIntlClientProvider, not inside it. Analytics components do not need i18n context.

Guardrails

All analytics components live in a single components/analytics.tsx file. Do not scatter them across the layout.
The GTM container ID must come from NEXT_PUBLIC_GTM_ID, never hardcoded. The component 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.

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