From 2e8726feec2e0d6ba8bd4db941009986e8e34141 Mon Sep 17 00:00:00 2001
From: Chris <7249920+chriswdmr@users.noreply.github.com>
Date: Thu, 14 Sep 2023 14:02:11 +0200
Subject: [PATCH] [@astrojs/vercel] Individually enable Speed Insights and Web
 Analytics (#8021)

* Individually enable Speed Insights and Web Analytics

* Update pnpm-lock.yaml

* Remove .only on tests

* Fix build

* Move `beforeSend` out of config

* Address feedback from review

* Update README.md

* Add back the `analytics` property and add deprecation warning when used

* Add migration guide for the deprecated `analytics` property

* Update packages/integrations/vercel/README.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update README.md

* Fix external dependency issue

* Simplify plugin and reduce scope

* Update .changeset/sixty-teachers-tap.md

Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>

* Apply feedback from review

* Move exposeEnv to speed-insights since it's only used there

---------

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
Co-authored-by: Matthew Phillips <matthew@skypack.dev>
Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>
---
 .changeset/sixty-teachers-tap.md              | 26 +++++++++++
 packages/integrations/vercel/README.md        | 37 ++++++++++++---
 packages/integrations/vercel/package.json     |  2 +-
 .../src/lib/{env.ts => speed-insights.ts}     | 14 ++++++
 .../vercel/src/lib/web-analytics.ts           | 30 ++++++++++++
 .../vercel/src/serverless/adapter.ts          | 43 +++++++++++++----
 .../src/{analytics.ts => speed-insights.ts}   | 33 ++++++-------
 .../integrations/vercel/src/static/adapter.ts | 39 +++++++++++++---
 packages/integrations/vercel/src/types.d.ts   |  3 ++
 .../output-as-server/astro.config.mjs         | 10 ++++
 .../output-as-server/package.json             |  9 ++++
 .../output-as-server/src/pages/one.astro      |  8 ++++
 .../output-as-server/src/pages/two.astro      |  8 ++++
 .../output-as-static/astro.config.mjs         | 10 ++++
 .../output-as-static/package.json             |  9 ++++
 .../output-as-static/src/pages/one.astro      |  8 ++++
 .../output-as-static/src/pages/two.astro      |  8 ++++
 .../output-as-static/astro.config.mjs         | 10 ++++
 .../output-as-static/package.json             |  9 ++++
 .../output-as-static/src/pages/one.astro      |  8 ++++
 .../output-as-static/src/pages/two.astro      |  8 ++++
 .../vercel/test/speed-insights.test.js        | 46 +++++++++++++++++++
 .../vercel/test/web-analytics.test.js         | 25 ++++++++++
 pnpm-lock.yaml                                | 36 +++++++++++++++
 24 files changed, 402 insertions(+), 37 deletions(-)
 create mode 100644 .changeset/sixty-teachers-tap.md
 rename packages/integrations/vercel/src/lib/{env.ts => speed-insights.ts} (68%)
 create mode 100644 packages/integrations/vercel/src/lib/web-analytics.ts
 rename packages/integrations/vercel/src/{analytics.ts => speed-insights.ts} (60%)
 create mode 100644 packages/integrations/vercel/src/types.d.ts
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/astro.config.mjs
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/package.json
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/one.astro
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/two.astro
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/astro.config.mjs
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/package.json
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/one.astro
 create mode 100644 packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/two.astro
 create mode 100644 packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/astro.config.mjs
 create mode 100644 packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/package.json
 create mode 100644 packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/one.astro
 create mode 100644 packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/two.astro
 create mode 100644 packages/integrations/vercel/test/speed-insights.test.js
 create mode 100644 packages/integrations/vercel/test/web-analytics.test.js

diff --git a/.changeset/sixty-teachers-tap.md b/.changeset/sixty-teachers-tap.md
new file mode 100644
index 000000000..122557751
--- /dev/null
+++ b/.changeset/sixty-teachers-tap.md
@@ -0,0 +1,26 @@
+---
+'@astrojs/vercel': minor
+---
+
+Enable Vercel Speed Insights and Vercel Web Analytics individually.
+Deprecates the `analytics` property in `astro.config.mjs` in favor of `speedInsights` and `webAnalytics`.
+
+If you're using the `analytics` property, you'll need to update your config to use the new properties:
+
+```diff
+// astro.config.mjs
+export default defineConfig({
+	adapter: vercel({
+-		analytics: true,
++		webAnalytics: {
++			enabled: true
++		},
++		speedInsights: {
++			enabled: true
++		}
+	})
+});
+```
+
+Allow configuration of Web Analytics with all available configuration options.
+Bumps @vercel/analytics package to the latest version.
diff --git a/packages/integrations/vercel/README.md b/packages/integrations/vercel/README.md
index db3a52a03..7776c2b30 100644
--- a/packages/integrations/vercel/README.md
+++ b/packages/integrations/vercel/README.md
@@ -85,13 +85,13 @@ vercel deploy --prebuilt
 
 To configure this adapter, pass an object to the `vercel()` function call in `astro.config.mjs`:
 
-### analytics
+### Web Analytics
 
-**Type:** `boolean`<br>
-**Available for:** Serverless, Static<br>
-**Added in:** `@astrojs/vercel@3.1.0`
+**Type:** `VercelWebAnalyticsConfig`<br>
+**Available for:** Serverless, Edge, Static<br>
+**Added in:** `@astrojs/vercel@3.8.0`
 
-You can enable [Vercel Analytics](https://vercel.com/analytics) (including Web Vitals and Audiences) by setting `analytics: true`. This will inject Vercel’s tracking scripts into all your pages.
+You can enable [Vercel Web Analytics](https://vercel.com/docs/concepts/analytics) by setting `webAnalytics: { enabled: true }`. This will inject Vercel’s tracking scripts into all of your pages.
 
 ```js
 // astro.config.mjs
@@ -101,7 +101,32 @@ import vercel from '@astrojs/vercel/serverless';
 export default defineConfig({
   output: 'server',
   adapter: vercel({
-    analytics: true,
+    webAnalytics: {
+      enabled: true,
+    },
+  }),
+});
+```
+
+### Speed Insights
+
+You can enable [Vercel Speed Insights](https://vercel.com/docs/concepts/speed-insights) by setting `speedInsights: { enabled: true }`. This will collect and send Web Vital data to Vercel.
+
+**Type:** `VercelSpeedInsightsConfig`<br>
+**Available for:** Serverless, Edge, Static<br>
+**Added in:** `@astrojs/vercel@3.8.0`
+
+```js
+// astro.config.mjs
+import { defineConfig } from 'astro/config';
+import vercel from '@astrojs/vercel/serverless';
+
+export default defineConfig({
+  output: 'server',
+  adapter: vercel({
+    speedInsights: {
+      enabled: true,
+    },
   }),
 });
 ```
diff --git a/packages/integrations/vercel/package.json b/packages/integrations/vercel/package.json
index 34bbb269b..60c0878f1 100644
--- a/packages/integrations/vercel/package.json
+++ b/packages/integrations/vercel/package.json
@@ -22,7 +22,7 @@
     "./serverless": "./dist/serverless/adapter.js",
     "./serverless/entrypoint": "./dist/serverless/entrypoint.js",
     "./static": "./dist/static/adapter.js",
-    "./analytics": "./dist/analytics.js",
+    "./speed-insights": "./dist/speed-insights.js",
     "./build-image-service": "./dist/image/build-service.js",
     "./dev-image-service": "./dist/image/dev-service.js",
     "./squoosh-dev-service": "./dist/image/squoosh-dev-service.js",
diff --git a/packages/integrations/vercel/src/lib/env.ts b/packages/integrations/vercel/src/lib/speed-insights.ts
similarity index 68%
rename from packages/integrations/vercel/src/lib/env.ts
rename to packages/integrations/vercel/src/lib/speed-insights.ts
index 01d8c76a5..8e3639536 100644
--- a/packages/integrations/vercel/src/lib/env.ts
+++ b/packages/integrations/vercel/src/lib/speed-insights.ts
@@ -1,3 +1,17 @@
+export type VercelSpeedInsightsConfig = {
+	enabled: boolean;
+};
+
+export function getSpeedInsightsViteConfig(enabled?: boolean) {
+	if (enabled) {
+		return {
+			define: exposeEnv(['VERCEL_ANALYTICS_ID']),
+		};
+	}
+
+	return {};
+}
+
 /**
  * While Vercel adds the `PUBLIC_` prefix for their `VERCEL_` env vars by default, some env vars
  * like `VERCEL_ANALYTICS_ID` aren't, so handle them here so that it works correctly in runtime.
diff --git a/packages/integrations/vercel/src/lib/web-analytics.ts b/packages/integrations/vercel/src/lib/web-analytics.ts
new file mode 100644
index 000000000..d6ee4d78d
--- /dev/null
+++ b/packages/integrations/vercel/src/lib/web-analytics.ts
@@ -0,0 +1,30 @@
+export type VercelWebAnalyticsConfig = {
+	enabled: boolean;
+};
+
+export async function getInjectableWebAnalyticsContent({
+	mode,
+}: {
+	mode: 'development' | 'production';
+}) {
+	const base = `window.va = window.va || function () { (window.vaq = window.vaq || []).push(arguments); };`;
+
+	if (mode === 'development') {
+		return `
+			${base}
+			var script = document.createElement('script');
+			script.defer = true;
+			script.src = 'https://cdn.vercel-insights.com/v1/script.debug.js';
+			var head = document.querySelector('head');
+			head.appendChild(script);
+		`;
+	}
+
+	return `${base}
+		var script = document.createElement('script');
+		script.defer = true;
+		script.src = '/_vercel/insights/script.js';
+		var head = document.querySelector('head');
+		head.appendChild(script);
+	`;
+}
diff --git a/packages/integrations/vercel/src/serverless/adapter.ts b/packages/integrations/vercel/src/serverless/adapter.ts
index 22785abf5..12fb2caa7 100644
--- a/packages/integrations/vercel/src/serverless/adapter.ts
+++ b/packages/integrations/vercel/src/serverless/adapter.ts
@@ -15,10 +15,17 @@ import {
 	type DevImageService,
 	type VercelImageConfig,
 } from '../image/shared.js';
-import { exposeEnv } from '../lib/env.js';
 import { getVercelOutput, removeDir, writeJson } from '../lib/fs.js';
 import { copyDependenciesToFunction } from '../lib/nft.js';
 import { getRedirects } from '../lib/redirects.js';
+import {
+	getSpeedInsightsViteConfig,
+	type VercelSpeedInsightsConfig,
+} from '../lib/speed-insights.js';
+import {
+	getInjectableWebAnalyticsContent,
+	type VercelWebAnalyticsConfig,
+} from '../lib/web-analytics.js';
 import { generateEdgeMiddleware } from './middleware.js';
 
 const PACKAGE_NAME = '@astrojs/vercel/serverless';
@@ -64,9 +71,14 @@ function getAdapter({
 }
 
 export interface VercelServerlessConfig {
+	/**
+	 * @deprecated
+	 */
+	analytics?: boolean;
+	webAnalytics?: VercelWebAnalyticsConfig;
+	speedInsights?: VercelSpeedInsightsConfig;
 	includeFiles?: string[];
 	excludeFiles?: string[];
-	analytics?: boolean;
 	imageService?: boolean;
 	imagesConfig?: VercelImageConfig;
 	devImageService?: DevImageService;
@@ -75,9 +87,11 @@ export interface VercelServerlessConfig {
 }
 
 export default function vercelServerless({
+	analytics,
+	webAnalytics,
+	speedInsights,
 	includeFiles,
 	excludeFiles,
-	analytics,
 	imageService,
 	imagesConfig,
 	devImageService = 'sharp',
@@ -131,12 +145,25 @@ export default function vercelServerless({
 	return {
 		name: PACKAGE_NAME,
 		hooks: {
-			'astro:config:setup': ({ command, config, updateConfig, injectScript }) => {
-				if (command === 'build' && analytics) {
-					injectScript('page', 'import "@astrojs/vercel/analytics"');
+			'astro:config:setup': async ({ command, config, updateConfig, injectScript, logger }) => {
+				if (webAnalytics?.enabled || analytics) {
+					if (analytics) {
+						logger.warn(
+							`The \`analytics\` property is deprecated. Please use the new \`webAnalytics\` and \`speedInsights\` properties instead.`
+						);
+					}
+
+					injectScript(
+						'head-inline',
+						await getInjectableWebAnalyticsContent({
+							mode: command === 'dev' ? 'development' : 'production',
+						})
+					);
+				}
+				if (command === 'build' && (speedInsights?.enabled || analytics)) {
+					injectScript('page', 'import "@astrojs/vercel/speed-insights"');
 				}
 				const outDir = getVercelOutput(config.root);
-				const viteDefine = exposeEnv(['VERCEL_ANALYTICS_ID']);
 				updateConfig({
 					outDir,
 					build: {
@@ -145,7 +172,7 @@ export default function vercelServerless({
 						server: new URL('./dist/', config.root),
 					},
 					vite: {
-						define: viteDefine,
+						...getSpeedInsightsViteConfig(speedInsights?.enabled || analytics),
 						ssr: {
 							external: ['@vercel/nft'],
 						},
diff --git a/packages/integrations/vercel/src/analytics.ts b/packages/integrations/vercel/src/speed-insights.ts
similarity index 60%
rename from packages/integrations/vercel/src/analytics.ts
rename to packages/integrations/vercel/src/speed-insights.ts
index 95dee83e3..cd2ae7fe8 100644
--- a/packages/integrations/vercel/src/analytics.ts
+++ b/packages/integrations/vercel/src/speed-insights.ts
@@ -1,8 +1,7 @@
-import { inject } from '@vercel/analytics';
 import type { Metric } from 'web-vitals';
-import { getCLS, getFCP, getFID, getLCP, getTTFB } from 'web-vitals';
+import { onCLS, onFCP, onFID, onLCP, onTTFB } from 'web-vitals';
 
-const vitalsUrl = 'https://vitals.vercel-analytics.com/v1/vitals';
+const SPEED_INSIGHTS_INTAKE = 'https://vitals.vercel-analytics.com/v1/vitals';
 
 type Options = { path: string; analyticsId: string };
 
@@ -14,7 +13,7 @@ const getConnectionSpeed = () => {
 		: '';
 };
 
-const sendToAnalytics = (metric: Metric, options: Options) => {
+const sendToSpeedInsights = (metric: Metric, options: Options) => {
 	const body = {
 		dsn: options.analyticsId,
 		id: metric.id,
@@ -28,9 +27,9 @@ const sendToAnalytics = (metric: Metric, options: Options) => {
 		type: 'application/x-www-form-urlencoded',
 	});
 	if (navigator.sendBeacon) {
-		navigator.sendBeacon(vitalsUrl, blob);
+		navigator.sendBeacon(SPEED_INSIGHTS_INTAKE, blob);
 	} else
-		fetch(vitalsUrl, {
+		fetch(SPEED_INSIGHTS_INTAKE, {
 			body: blob,
 			method: 'POST',
 			credentials: 'omit',
@@ -38,27 +37,29 @@ const sendToAnalytics = (metric: Metric, options: Options) => {
 		});
 };
 
-function webVitals() {
+function collectWebVitals() {
 	const analyticsId = (import.meta as any).env.PUBLIC_VERCEL_ANALYTICS_ID;
+
 	if (!analyticsId) {
-		console.error('[Analytics] VERCEL_ANALYTICS_ID not found');
+		console.error('[Speed Insights] VERCEL_ANALYTICS_ID not found');
 		return;
 	}
+
 	const options: Options = { path: window.location.pathname, analyticsId };
+
 	try {
-		getFID((metric) => sendToAnalytics(metric, options));
-		getTTFB((metric) => sendToAnalytics(metric, options));
-		getLCP((metric) => sendToAnalytics(metric, options));
-		getCLS((metric) => sendToAnalytics(metric, options));
-		getFCP((metric) => sendToAnalytics(metric, options));
+		onFID((metric) => sendToSpeedInsights(metric, options));
+		onTTFB((metric) => sendToSpeedInsights(metric, options));
+		onLCP((metric) => sendToSpeedInsights(metric, options));
+		onCLS((metric) => sendToSpeedInsights(metric, options));
+		onFCP((metric) => sendToSpeedInsights(metric, options));
 	} catch (err) {
-		console.error('[Analytics]', err);
+		console.error('[Speed Insights]', err);
 	}
 }
 
 const mode = (import.meta as any).env.MODE as 'development' | 'production';
 
-inject({ mode });
 if (mode === 'production') {
-	webVitals();
+	collectWebVitals();
 }
diff --git a/packages/integrations/vercel/src/static/adapter.ts b/packages/integrations/vercel/src/static/adapter.ts
index 27bc2fe2d..df2995c37 100644
--- a/packages/integrations/vercel/src/static/adapter.ts
+++ b/packages/integrations/vercel/src/static/adapter.ts
@@ -6,10 +6,17 @@ import {
 	type DevImageService,
 	type VercelImageConfig,
 } from '../image/shared.js';
-import { exposeEnv } from '../lib/env.js';
 import { emptyDir, getVercelOutput, writeJson } from '../lib/fs.js';
 import { isServerLikeOutput } from '../lib/prerender.js';
 import { getRedirects } from '../lib/redirects.js';
+import {
+	getSpeedInsightsViteConfig,
+	type VercelSpeedInsightsConfig,
+} from '../lib/speed-insights.js';
+import {
+	getInjectableWebAnalyticsContent,
+	type VercelWebAnalyticsConfig,
+} from '../lib/web-analytics.js';
 
 const PACKAGE_NAME = '@astrojs/vercel/static';
 
@@ -34,7 +41,12 @@ function getAdapter(): AstroAdapter {
 }
 
 export interface VercelStaticConfig {
+	/**
+	 * @deprecated
+	 */
 	analytics?: boolean;
+	webAnalytics?: VercelWebAnalyticsConfig;
+	speedInsights?: VercelSpeedInsightsConfig;
 	imageService?: boolean;
 	imagesConfig?: VercelImageConfig;
 	devImageService?: DevImageService;
@@ -42,6 +54,8 @@ export interface VercelStaticConfig {
 
 export default function vercelStatic({
 	analytics,
+	webAnalytics,
+	speedInsights,
 	imageService,
 	imagesConfig,
 	devImageService = 'sharp',
@@ -51,12 +65,25 @@ export default function vercelStatic({
 	return {
 		name: '@astrojs/vercel',
 		hooks: {
-			'astro:config:setup': ({ command, config, injectScript, updateConfig }) => {
-				if (command === 'build' && analytics) {
-					injectScript('page', 'import "@astrojs/vercel/analytics"');
+			'astro:config:setup': async ({ command, config, injectScript, updateConfig, logger }) => {
+				if (webAnalytics?.enabled || analytics) {
+					if (analytics) {
+						logger.warn(
+							`The \`analytics\` property is deprecated. Please use the new \`webAnalytics\` and \`speedInsights\` properties instead.`
+						);
+					}
+
+					injectScript(
+						'head-inline',
+						await getInjectableWebAnalyticsContent({
+							mode: command === 'dev' ? 'development' : 'production',
+						})
+					);
+				}
+				if (command === 'build' && (speedInsights?.enabled || analytics)) {
+					injectScript('page', 'import "@astrojs/vercel/speed-insights"');
 				}
 				const outDir = new URL('./static/', getVercelOutput(config.root));
-				const viteDefine = exposeEnv(['VERCEL_ANALYTICS_ID']);
 				updateConfig({
 					outDir,
 					build: {
@@ -64,7 +91,7 @@ export default function vercelStatic({
 						redirects: false,
 					},
 					vite: {
-						define: viteDefine,
+						...getSpeedInsightsViteConfig(speedInsights?.enabled || analytics),
 					},
 					...getAstroImageConfig(
 						imageService,
diff --git a/packages/integrations/vercel/src/types.d.ts b/packages/integrations/vercel/src/types.d.ts
new file mode 100644
index 000000000..1c5b8d2db
--- /dev/null
+++ b/packages/integrations/vercel/src/types.d.ts
@@ -0,0 +1,3 @@
+import type { AnalyticsProps } from '@vercel/analytics';
+
+export type VercelWebAnalyticsBeforeSend = AnalyticsProps['beforeSend'];
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/astro.config.mjs b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/astro.config.mjs
new file mode 100644
index 000000000..b505034ce
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/astro.config.mjs
@@ -0,0 +1,10 @@
+import { defineConfig } from 'astro/config';
+import vercel from '@astrojs/vercel/serverless';
+
+export default defineConfig({
+	adapter: vercel({
+		speedInsights: {
+			enabled: true
+		}
+	})
+});
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/package.json b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/package.json
new file mode 100644
index 000000000..4c6867fd3
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@test/astro-vercel-with-speed-insights-enabled-output-as-server",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "@astrojs/vercel": "workspace:*",
+    "astro": "workspace:*"
+  }
+}
\ No newline at end of file
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/one.astro b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/one.astro
new file mode 100644
index 000000000..0c7fb90a7
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/one.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>One</title>
+	</head>
+	<body>
+		<h1>One</h1>
+	</body>
+</html>
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/two.astro b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/two.astro
new file mode 100644
index 000000000..e7ba9910e
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server/src/pages/two.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>Two</title>
+	</head>
+	<body>
+		<h1>Two</h1>
+	</body>
+</html>
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/astro.config.mjs b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/astro.config.mjs
new file mode 100644
index 000000000..a38f1e939
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/astro.config.mjs
@@ -0,0 +1,10 @@
+import { defineConfig } from 'astro/config';
+import vercel from '@astrojs/vercel/static';
+
+export default defineConfig({
+	adapter: vercel({
+		speedInsights: {
+			enabled: true
+		}
+	})
+});
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/package.json b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/package.json
new file mode 100644
index 000000000..0022e1e92
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@test/astro-vercel-with-speed-insights-enabled-output-as-static",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "@astrojs/vercel": "workspace:*",
+    "astro": "workspace:*"
+  }
+}
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/one.astro b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/one.astro
new file mode 100644
index 000000000..0c7fb90a7
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/one.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>One</title>
+	</head>
+	<body>
+		<h1>One</h1>
+	</body>
+</html>
diff --git a/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/two.astro b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/two.astro
new file mode 100644
index 000000000..e7ba9910e
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static/src/pages/two.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>Two</title>
+	</head>
+	<body>
+		<h1>Two</h1>
+	</body>
+</html>
diff --git a/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/astro.config.mjs b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/astro.config.mjs
new file mode 100644
index 000000000..395cc9478
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/astro.config.mjs
@@ -0,0 +1,10 @@
+import { defineConfig } from 'astro/config';
+import vercel from '@astrojs/vercel/static';
+
+export default defineConfig({
+	adapter: vercel({
+		webAnalytics: {
+			enabled: true
+		}
+	})
+});
diff --git a/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/package.json b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/package.json
new file mode 100644
index 000000000..c54ef16c7
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@test/astro-vercel-with-web-analytics-enabled-output-as-static",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "@astrojs/vercel": "workspace:*",
+    "astro": "workspace:*"
+  }
+}
diff --git a/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/one.astro b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/one.astro
new file mode 100644
index 000000000..0c7fb90a7
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/one.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>One</title>
+	</head>
+	<body>
+		<h1>One</h1>
+	</body>
+</html>
diff --git a/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/two.astro b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/two.astro
new file mode 100644
index 000000000..e7ba9910e
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static/src/pages/two.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>Two</title>
+	</head>
+	<body>
+		<h1>Two</h1>
+	</body>
+</html>
diff --git a/packages/integrations/vercel/test/speed-insights.test.js b/packages/integrations/vercel/test/speed-insights.test.js
new file mode 100644
index 000000000..7cf2ae778
--- /dev/null
+++ b/packages/integrations/vercel/test/speed-insights.test.js
@@ -0,0 +1,46 @@
+import { loadFixture } from './test-utils.js';
+import { expect } from 'chai';
+
+describe('Vercel Speed Insights', () => {
+	describe('output: server', () => {
+		/** @type {import('./test-utils.js').Fixture} */
+		let fixture;
+
+		before(async () => {
+			fixture = await loadFixture({
+				root: './fixtures/with-speed-insights-enabled/output-as-server/',
+				output: 'server',
+			});
+			await fixture.build();
+		});
+
+		it('ensures that Vercel Speed Insights is present in the bundle', async () => {
+			const [page] = await fixture.readdir('../.vercel/output/static/_astro');
+
+			const bundle = await fixture.readFile(`../.vercel/output/static/_astro/${page}`);
+
+			expect(bundle).to.contain('https://vitals.vercel-analytics.com/v1/vitals');
+		});
+	});
+
+	describe('output: static', () => {
+		/** @type {import('./test-utils.js').Fixture} */
+		let fixture;
+
+		before(async () => {
+			fixture = await loadFixture({
+				root: './fixtures/with-speed-insights-enabled/output-as-static/',
+				output: 'static',
+			});
+			await fixture.build();
+		});
+
+		it('ensures that Vercel Speed Insights is present in the bundle', async () => {
+			const [page] = await fixture.readdir('../.vercel/output/static/_astro');
+
+			const bundle = await fixture.readFile(`../.vercel/output/static/_astro/${page}`);
+
+			expect(bundle).to.contain('https://vitals.vercel-analytics.com/v1/vitals');
+		});
+	});
+});
diff --git a/packages/integrations/vercel/test/web-analytics.test.js b/packages/integrations/vercel/test/web-analytics.test.js
new file mode 100644
index 000000000..b728fae4c
--- /dev/null
+++ b/packages/integrations/vercel/test/web-analytics.test.js
@@ -0,0 +1,25 @@
+import { loadFixture } from './test-utils.js';
+import { expect } from 'chai';
+
+describe('Vercel Web Analytics', () => {
+	describe('output: static', () => {
+		/** @type {import('./test-utils.js').Fixture} */
+		let fixture;
+
+		before(async () => {
+			fixture = await loadFixture({
+				root: './fixtures/with-web-analytics-enabled/output-as-static/',
+				output: 'static',
+			});
+			await fixture.build();
+		});
+
+		it('ensures that Vercel Web Analytics is present in the header', async () => {
+			const pageOne = await fixture.readFile('../.vercel/output/static/one/index.html');
+			const pageTwo = await fixture.readFile('../.vercel/output/static/two/index.html');
+
+			expect(pageOne).to.contain('/_vercel/insights/script.js');
+			expect(pageTwo).to.contain('/_vercel/insights/script.js');
+		});
+	});
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e178a0ee9..66287ebc7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -4840,6 +4840,42 @@ importers:
         specifier: workspace:*
         version: link:../../../../../astro
 
+  packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-server:
+    dependencies:
+      '@astrojs/vercel':
+        specifier: workspace:*
+        version: link:../../../..
+      astro:
+        specifier: workspace:*
+        version: link:../../../../../../astro
+
+  packages/integrations/vercel/test/fixtures/with-speed-insights-enabled/output-as-static:
+    dependencies:
+      '@astrojs/vercel':
+        specifier: workspace:*
+        version: link:../../../..
+      astro:
+        specifier: workspace:*
+        version: link:../../../../../../astro
+
+  packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-server:
+    dependencies:
+      '@astrojs/vercel':
+        specifier: workspace:*
+        version: link:../../../..
+      astro:
+        specifier: workspace:*
+        version: link:../../../../../../astro
+
+  packages/integrations/vercel/test/fixtures/with-web-analytics-enabled/output-as-static:
+    dependencies:
+      '@astrojs/vercel':
+        specifier: workspace:*
+        version: link:../../../..
+      astro:
+        specifier: workspace:*
+        version: link:../../../../../../astro
+
   packages/integrations/vercel/test/hosted/hosted-astro-project:
     dependencies:
       '@astrojs/vercel':