From 745bb3524b5321fcf92ed3564772b61c2d6ef6f8 Mon Sep 17 00:00:00 2001
From: s1gr1d <32902192+s1gr1d@users.noreply.github.com>
Date: Fri, 2 Jan 2026 13:20:39 +0100
Subject: [PATCH 1/6] feat(nuxt): Detect development environment and add dev
 E2E test

---
 .../test-applications/nuxt-4/package.json     |  5 +-
 .../nuxt-4/playwright.config.ts               | 20 ++++++-
 .../nuxt-4/tests/environment.test.ts          | 55 +++++++++++++++++++
 .../nuxt-4/tests/isDevMode.ts                 |  2 +
 packages/core/src/constants.ts                |  1 +
 packages/core/src/index.ts                    |  2 +-
 packages/nuxt/package.json                    |  1 +
 packages/nuxt/src/client/sdk.ts               |  4 +-
 packages/nuxt/src/server/sdk.ts               | 14 ++++-
 9 files changed, 98 insertions(+), 6 deletions(-)
 create mode 100644 dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
 create mode 100644 dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts

diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/package.json b/dev-packages/e2e-tests/test-applications/nuxt-4/package.json
index eb28e69b0633..b64166c61702 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/package.json
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/package.json
@@ -5,15 +5,18 @@
   "scripts": {
     "build": "nuxt build",
     "dev": "nuxt dev",
+    "dev:sentry": "NODE_OPTIONS='--import ./.nuxt/dev/sentry.server.config.mjs' nuxt dev",
     "generate": "nuxt generate",
     "preview": "nuxt preview",
     "start": "node .output/server/index.mjs",
     "start:import": "node --import ./.output/server/sentry.server.config.mjs .output/server/index.mjs",
     "clean": "npx nuxi cleanup",
     "test": "playwright test",
+    "test:prod": "TEST_ENV=production playwright test",
+    "test:dev": "TEST_ENV=development playwright test",
     "test:build": "pnpm install && pnpm build",
     "test:build-canary": "pnpm add nuxt@npm:nuxt-nightly@latest && pnpm add nitropack@npm:nitropack-nightly@latest && pnpm install --force && pnpm build",
-    "test:assert": "pnpm test"
+    "test:assert": "pnpm test:prod && pnpm test:dev"
   },
   "dependencies": {
     "@pinia/nuxt": "^0.5.5",
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts
index e07fb02e5218..f5079f73202b 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts
@@ -1,7 +1,25 @@
 import { getPlaywrightConfig } from '@sentry-internal/test-utils';
 
+const testEnv = process.env.TEST_ENV;
+
+if (!testEnv) {
+  throw new Error('No test env defined');
+}
+
+const getStartCommand = () => {
+  if (testEnv === 'development') {
+    return 'pnpm dev';
+  }
+
+  if (testEnv === 'production') {
+    return 'pnpm start:import';
+  }
+
+  throw new Error(`Unknown test env: ${testEnv}`);
+};
+
 const config = getPlaywrightConfig({
-  startCommand: `pnpm start:import`,
+  startCommand: getStartCommand(),
 });
 
 export default config;
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
new file mode 100644
index 000000000000..1b85bd5ea368
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
@@ -0,0 +1,55 @@
+import { expect, test } from '@playwright/test';
+import { waitForError, waitForTransaction } from '@sentry-internal/test-utils';
+import { isDevMode } from './isDevMode';
+
+test.describe('environment detection', async () => {
+  test('sets correct environment for application errors', async ({ page }) => {
+    const errorPromise = waitForError('nuxt-4', async errorEvent => {
+      return errorEvent?.exception?.values?.[0]?.value === 'Error thrown from Nuxt-4 E2E test app';
+    });
+
+    await page.goto(`/client-error`);
+    await page.locator('#errorBtn').click();
+
+    const error = await errorPromise;
+
+    if (isDevMode) {
+      expect(error.environment).toBe('development');
+    } else {
+      expect(error.environment).toBe('production');
+    }
+  });
+
+  test('sets correct environment for application transactions', async ({ page }) => {
+    const transactionPromise = waitForTransaction('nuxt-4', async transactionEvent => {
+      return transactionEvent.transaction === '/test-param/:param()';
+    });
+
+    await page.goto(`/test-param/1234`);
+
+    const transaction = await transactionPromise;
+
+    if (isDevMode) {
+      expect(transaction.environment).toBe('development');
+    } else {
+      expect(transaction.environment).toBe('production');
+    }
+  });
+
+  test('includes environment in event context', async ({ page }) => {
+    const errorPromise = waitForError('nuxt-4', async errorEvent => {
+      return errorEvent?.exception?.values?.[0]?.value === 'Error thrown from Nuxt-4 E2E test app';
+    });
+
+    await page.goto(`/client-error`);
+    await page.locator('#errorBtn').click();
+
+    const error = await errorPromise;
+
+    if (isDevMode) {
+      expect(error.environment).toBe('development');
+    } else {
+      expect(error.environment).toBe('production');
+    }
+  });
+});
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts
new file mode 100644
index 000000000000..94163ff68beb
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts
@@ -0,0 +1,2 @@
+export const isDevMode = !!process.env.TEST_ENV && process.env.TEST_ENV.includes('development');
+
diff --git a/packages/core/src/constants.ts b/packages/core/src/constants.ts
index 38475b857ace..7fdc380faf0d 100644
--- a/packages/core/src/constants.ts
+++ b/packages/core/src/constants.ts
@@ -1 +1,2 @@
 export const DEFAULT_ENVIRONMENT = 'production';
+export const DEV_ENVIRONMENT = 'development';
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index c4884edf939b..30e24c3b35c7 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -101,7 +101,7 @@ export {
   headersToDict,
   httpHeadersToSpanAttributes,
 } from './utils/request';
-export { DEFAULT_ENVIRONMENT } from './constants';
+export { DEFAULT_ENVIRONMENT, DEV_ENVIRONMENT } from './constants';
 export { addBreadcrumb } from './breadcrumbs';
 export { functionToStringIntegration } from './integrations/functiontostring';
 // eslint-disable-next-line deprecation/deprecation
diff --git a/packages/nuxt/package.json b/packages/nuxt/package.json
index bbb4086d3dc2..37e6e52c1477 100644
--- a/packages/nuxt/package.json
+++ b/packages/nuxt/package.json
@@ -53,6 +53,7 @@
     "@sentry/cloudflare": "10.32.1",
     "@sentry/core": "10.32.1",
     "@sentry/node": "10.32.1",
+    "@sentry/node-core": "10.32.1",
     "@sentry/rollup-plugin": "^4.6.1",
     "@sentry/vite-plugin": "^4.6.1",
     "@sentry/vue": "10.32.1"
diff --git a/packages/nuxt/src/client/sdk.ts b/packages/nuxt/src/client/sdk.ts
index 5db856dae689..4c683272ade2 100644
--- a/packages/nuxt/src/client/sdk.ts
+++ b/packages/nuxt/src/client/sdk.ts
@@ -1,6 +1,7 @@
 import { getDefaultIntegrations as getBrowserDefaultIntegrations, init as initBrowser } from '@sentry/browser';
 import type { Client } from '@sentry/core';
-import { applySdkMetadata } from '@sentry/core';
+import { applySdkMetadata, DEFAULT_ENVIRONMENT, DEV_ENVIRONMENT } from '@sentry/core';
+import { isCjs } from '@sentry/node-core';
 import type { SentryNuxtClientOptions } from '../common/types';
 
 /**
@@ -12,6 +13,7 @@ export function init(options: SentryNuxtClientOptions): Client | undefined {
   const sentryOptions = {
     /* BrowserTracing is added later with the Nuxt client plugin */
     defaultIntegrations: [...getBrowserDefaultIntegrations(options)],
+    environment: !isCjs() && import.meta.dev ? DEV_ENVIRONMENT : DEFAULT_ENVIRONMENT,
     ...options,
   };
 
diff --git a/packages/nuxt/src/server/sdk.ts b/packages/nuxt/src/server/sdk.ts
index 2b492b1249ac..e70d637b6b4b 100644
--- a/packages/nuxt/src/server/sdk.ts
+++ b/packages/nuxt/src/server/sdk.ts
@@ -1,12 +1,21 @@
 import * as path from 'node:path';
 import type { Client, Event, EventProcessor, Integration } from '@sentry/core';
-import { applySdkMetadata, debug, flush, getGlobalScope, vercelWaitUntil } from '@sentry/core';
+import {
+  applySdkMetadata,
+  debug,
+  DEFAULT_ENVIRONMENT,
+  DEV_ENVIRONMENT,
+  flush,
+  getGlobalScope,
+  vercelWaitUntil,
+} from '@sentry/core';
 import {
   getDefaultIntegrations as getDefaultNodeIntegrations,
   httpIntegration,
   init as initNode,
   type NodeOptions,
 } from '@sentry/node';
+import { isCjs } from '@sentry/node-core';
 import { DEBUG_BUILD } from '../common/debug-build';
 import type { SentryNuxtServerOptions } from '../common/types';
 
@@ -17,8 +26,9 @@ import type { SentryNuxtServerOptions } from '../common/types';
  */
 export function init(options: SentryNuxtServerOptions): Client | undefined {
   const sentryOptions = {
-    ...options,
     defaultIntegrations: getNuxtDefaultIntegrations(options),
+    environment: !isCjs() && import.meta.dev ? DEV_ENVIRONMENT : DEFAULT_ENVIRONMENT,
+    ...options,
   };
 
   applySdkMetadata(sentryOptions, 'nuxt', ['nuxt', 'node']);

From 9bbb13c7a8357e726417728ad3aa043a4a0d2d15 Mon Sep 17 00:00:00 2001
From: s1gr1d <32902192+s1gr1d@users.noreply.github.com>
Date: Fri, 2 Jan 2026 13:23:08 +0100
Subject: [PATCH 2/6] add contributor

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8fdc6d9fb1d..7b9d0f765950 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
-Work in this release was contributed by @xgedev, @Mohataseem89, @sebws, and @G-Rath. Thank you for your contributions!
+Work in this release was contributed by @xgedev, @Mohataseem89, @sebws, @maximepvrt and @G-Rath. Thank you for your contributions!
 
 - ref(nextjs): Drop `resolve` dependency from the Next.js SDK ([#18618](https://github.com/getsentry/sentry-javascript/pull/18618))
 

From e463c3dec67ba19c1b7ba5ac68d97cdb037af7c1 Mon Sep 17 00:00:00 2001
From: s1gr1d <32902192+s1gr1d@users.noreply.github.com>
Date: Fri, 2 Jan 2026 13:29:59 +0100
Subject: [PATCH 3/6] remove node import from client

---
 packages/nuxt/src/client/sdk.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/packages/nuxt/src/client/sdk.ts b/packages/nuxt/src/client/sdk.ts
index 4c683272ade2..f0654a97c201 100644
--- a/packages/nuxt/src/client/sdk.ts
+++ b/packages/nuxt/src/client/sdk.ts
@@ -1,7 +1,6 @@
 import { getDefaultIntegrations as getBrowserDefaultIntegrations, init as initBrowser } from '@sentry/browser';
 import type { Client } from '@sentry/core';
 import { applySdkMetadata, DEFAULT_ENVIRONMENT, DEV_ENVIRONMENT } from '@sentry/core';
-import { isCjs } from '@sentry/node-core';
 import type { SentryNuxtClientOptions } from '../common/types';
 
 /**
@@ -13,7 +12,7 @@ export function init(options: SentryNuxtClientOptions): Client | undefined {
   const sentryOptions = {
     /* BrowserTracing is added later with the Nuxt client plugin */
     defaultIntegrations: [...getBrowserDefaultIntegrations(options)],
-    environment: !isCjs() && import.meta.dev ? DEV_ENVIRONMENT : DEFAULT_ENVIRONMENT,
+    environment: import.meta.dev ? DEV_ENVIRONMENT : DEFAULT_ENVIRONMENT,
     ...options,
   };
 

From f582ec27b234a6dd11d993fc9fda356ab2e84ccd Mon Sep 17 00:00:00 2001
From: s1gr1d <32902192+s1gr1d@users.noreply.github.com>
Date: Fri, 2 Jan 2026 16:10:05 +0100
Subject: [PATCH 4/6] add E2E test setup for dev

---
 .../nuxt-4/nuxt-start-dev-server.bash         | 32 +++++++++++++++++++
 .../test-applications/nuxt-4/package.json     |  3 +-
 .../nuxt-4/playwright.config.ts               |  2 +-
 .../nuxt-4/sentry.client.config.ts            |  1 -
 .../nuxt-4/sentry.server.config.ts            |  1 -
 .../nuxt-4/tests/environment.test.ts          | 20 ++----------
 .../nuxt-4/tests/isDevMode.ts                 |  1 -
 7 files changed, 36 insertions(+), 24 deletions(-)
 create mode 100644 dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash

diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash b/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash
new file mode 100644
index 000000000000..747893ab6632
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash
@@ -0,0 +1,32 @@
+#!/bin/bash
+# To enable Sentry in Nuxt dev, it needs the sentry.server.config.mjs file from the .nuxt folder.
+# First, we need to start 'nuxt dev' to generate the file, and then start 'nuxt dev' again with the NODE_OPTIONS to have Sentry enabled.
+
+# 1.  Start dev in background - this generates .nuxt folder
+#     Using a different port to avoid playwright already starting with the tests for port 3030
+pnpm dev -p 3035 &
+DEV_PID=$!
+
+# 2.  Wait for the sentry.server.config.mjs file to appear
+echo "Waiting for .nuxt/dev/sentry.server.config.mjs file..."
+COUNTER=0
+while [ ! -f ".nuxt/dev/sentry.server.config.mjs" ] && [ $COUNTER -lt 30 ]; do
+    sleep 1
+    ((COUNTER++))
+done
+
+if [ ! -f ".nuxt/dev/sentry.server.config.mjs" ]; then
+    echo "ERROR: .nuxt/dev/sentry.server.config.mjs file never appeared!"
+    pkill -P $DEV_PID || kill $DEV_PID || pkill -f "nuxt"
+    exit 1
+fi
+
+# 3.  Cleanup
+echo "Found .nuxt/dev/sentry.server.config.mjs, stopping 'nuxt dev' process..."
+pkill -P $DEV_PID || kill $DEV_PID || pkill -f "nuxt"
+sleep 2 # Give it a moment to release ports
+
+echo "Starting nuxt dev with Sentry server config..."
+
+# 4.  Start the actual dev command which should be used for the tests
+NODE_OPTIONS='--import ./.nuxt/dev/sentry.server.config.mjs' nuxt dev
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/package.json b/dev-packages/e2e-tests/test-applications/nuxt-4/package.json
index b64166c61702..ebd383e48eb9 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/package.json
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/package.json
@@ -5,7 +5,6 @@
   "scripts": {
     "build": "nuxt build",
     "dev": "nuxt dev",
-    "dev:sentry": "NODE_OPTIONS='--import ./.nuxt/dev/sentry.server.config.mjs' nuxt dev",
     "generate": "nuxt generate",
     "preview": "nuxt preview",
     "start": "node .output/server/index.mjs",
@@ -13,7 +12,7 @@
     "clean": "npx nuxi cleanup",
     "test": "playwright test",
     "test:prod": "TEST_ENV=production playwright test",
-    "test:dev": "TEST_ENV=development playwright test",
+    "test:dev": "TEST_ENV=development playwright test environment",
     "test:build": "pnpm install && pnpm build",
     "test:build-canary": "pnpm add nuxt@npm:nuxt-nightly@latest && pnpm add nitropack@npm:nitropack-nightly@latest && pnpm install --force && pnpm build",
     "test:assert": "pnpm test:prod && pnpm test:dev"
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts
index f5079f73202b..d3618f176d02 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/playwright.config.ts
@@ -8,7 +8,7 @@ if (!testEnv) {
 
 const getStartCommand = () => {
   if (testEnv === 'development') {
-    return 'pnpm dev';
+    return 'bash ./nuxt-start-dev-server.bash';
   }
 
   if (testEnv === 'production') {
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts
index 3cbea64827cb..7b5d97ff0b09 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts
@@ -2,7 +2,6 @@ import * as Sentry from '@sentry/nuxt';
 import { usePinia, useRuntimeConfig } from '#imports';
 
 Sentry.init({
-  environment: 'qa', // dynamic sampling bias to keep transactions
   dsn: useRuntimeConfig().public.sentry.dsn,
   tunnel: `http://localhost:3031/`, // proxy server
   tracesSampleRate: 1.0,
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.server.config.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.server.config.ts
index 729b2296c683..26519911072b 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.server.config.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.server.config.ts
@@ -2,7 +2,6 @@ import * as Sentry from '@sentry/nuxt';
 
 Sentry.init({
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
-  environment: 'qa', // dynamic sampling bias to keep transactions
   tracesSampleRate: 1.0, //  Capture 100% of the transactions
   tunnel: 'http://localhost:3031/', // proxy server
 });
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
index 1b85bd5ea368..f0aa2fd51535 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
@@ -8,7 +8,8 @@ test.describe('environment detection', async () => {
       return errorEvent?.exception?.values?.[0]?.value === 'Error thrown from Nuxt-4 E2E test app';
     });
 
-    await page.goto(`/client-error`);
+    // We have to wait for networkidle in dev mode because clicking the button is a no-op otherwise (network requests are blocked during page load)
+    await page.goto(`/client-error`, isDevMode ? { waitUntil: 'networkidle' } : {});
     await page.locator('#errorBtn').click();
 
     const error = await errorPromise;
@@ -35,21 +36,4 @@ test.describe('environment detection', async () => {
       expect(transaction.environment).toBe('production');
     }
   });
-
-  test('includes environment in event context', async ({ page }) => {
-    const errorPromise = waitForError('nuxt-4', async errorEvent => {
-      return errorEvent?.exception?.values?.[0]?.value === 'Error thrown from Nuxt-4 E2E test app';
-    });
-
-    await page.goto(`/client-error`);
-    await page.locator('#errorBtn').click();
-
-    const error = await errorPromise;
-
-    if (isDevMode) {
-      expect(error.environment).toBe('development');
-    } else {
-      expect(error.environment).toBe('production');
-    }
-  });
 });
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts
index 94163ff68beb..d2be94232110 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/isDevMode.ts
@@ -1,2 +1 @@
 export const isDevMode = !!process.env.TEST_ENV && process.env.TEST_ENV.includes('development');
-

From a35268daa3cd530029f73d446bece4a16b4b6a09 Mon Sep 17 00:00:00 2001
From: s1gr1d <32902192+s1gr1d@users.noreply.github.com>
Date: Wed, 7 Jan 2026 14:56:23 +0100
Subject: [PATCH 5/6] add tests for server-side; modify bash script

---
 .../nuxt-4/nuxt-start-dev-server.bash         | 27 +++++++++---
 .../nuxt-4/tests/environment.test.ts          | 42 ++++++++++++++++++-
 2 files changed, 62 insertions(+), 7 deletions(-)

diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash b/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash
index 747893ab6632..1204eabb7c87 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/nuxt-start-dev-server.bash
@@ -2,9 +2,11 @@
 # To enable Sentry in Nuxt dev, it needs the sentry.server.config.mjs file from the .nuxt folder.
 # First, we need to start 'nuxt dev' to generate the file, and then start 'nuxt dev' again with the NODE_OPTIONS to have Sentry enabled.
 
+# Using a different port to avoid playwright already starting with the tests for port 3030
+TEMP_PORT=3035
+
 # 1.  Start dev in background - this generates .nuxt folder
-#     Using a different port to avoid playwright already starting with the tests for port 3030
-pnpm dev -p 3035 &
+pnpm dev -p $TEMP_PORT &
 DEV_PID=$!
 
 # 2.  Wait for the sentry.server.config.mjs file to appear
@@ -17,14 +19,29 @@ done
 
 if [ ! -f ".nuxt/dev/sentry.server.config.mjs" ]; then
     echo "ERROR: .nuxt/dev/sentry.server.config.mjs file never appeared!"
-    pkill -P $DEV_PID || kill $DEV_PID || pkill -f "nuxt"
+    echo "This usually means the Nuxt dev server failed to start or generate the file. Try to rerun the test."
+    pkill -P $DEV_PID || kill $DEV_PID
     exit 1
 fi
 
 # 3.  Cleanup
 echo "Found .nuxt/dev/sentry.server.config.mjs, stopping 'nuxt dev' process..."
-pkill -P $DEV_PID || kill $DEV_PID || pkill -f "nuxt"
-sleep 2 # Give it a moment to release ports
+pkill -P $DEV_PID || kill $DEV_PID
+
+# Wait for port to be released
+echo "Waiting for port $TEMP_PORT to be released..."
+COUNTER=0
+# Check if port is still in use
+while lsof -i :$TEMP_PORT > /dev/null 2>&1 && [ $COUNTER -lt 10 ]; do
+    sleep 1
+    ((COUNTER++))
+done
+
+if lsof -i :$TEMP_PORT > /dev/null 2>&1; then
+    echo "WARNING: Port $TEMP_PORT still in use after 10 seconds, proceeding anyway..."
+else
+    echo "Port $TEMP_PORT released successfully"
+fi
 
 echo "Starting nuxt dev with Sentry server config..."
 
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
index f0aa2fd51535..b59e4560165b 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/environment.test.ts
@@ -3,7 +3,7 @@ import { waitForError, waitForTransaction } from '@sentry-internal/test-utils';
 import { isDevMode } from './isDevMode';
 
 test.describe('environment detection', async () => {
-  test('sets correct environment for application errors', async ({ page }) => {
+  test('sets correct environment for client-side errors', async ({ page }) => {
     const errorPromise = waitForError('nuxt-4', async errorEvent => {
       return errorEvent?.exception?.values?.[0]?.value === 'Error thrown from Nuxt-4 E2E test app';
     });
@@ -21,7 +21,7 @@ test.describe('environment detection', async () => {
     }
   });
 
-  test('sets correct environment for application transactions', async ({ page }) => {
+  test('sets correct environment for client-side transactions', async ({ page }) => {
     const transactionPromise = waitForTransaction('nuxt-4', async transactionEvent => {
       return transactionEvent.transaction === '/test-param/:param()';
     });
@@ -36,4 +36,42 @@ test.describe('environment detection', async () => {
       expect(transaction.environment).toBe('production');
     }
   });
+
+  test('sets correct environment for server-side errors', async ({ page }) => {
+    const errorPromise = waitForError('nuxt-4', async errorEvent => {
+      return errorEvent?.exception?.values?.[0]?.value === 'Nuxt 4 Server error';
+    });
+
+    await page.goto(`/fetch-server-routes`, isDevMode ? { waitUntil: 'networkidle' } : {});
+    await page.getByText('Fetch Server API Error', { exact: true }).click();
+
+    const error = await errorPromise;
+
+    expect(error.transaction).toBe('GET /api/server-error');
+
+    if (isDevMode) {
+      expect(error.environment).toBe('development');
+    } else {
+      expect(error.environment).toBe('production');
+    }
+  });
+
+  test('sets correct environment for server-side transactions', async ({ page }) => {
+    const transactionPromise = waitForTransaction('nuxt-4', async transactionEvent => {
+      return transactionEvent.transaction === 'GET /api/nitro-fetch';
+    });
+
+    await page.goto(`/fetch-server-routes`, isDevMode ? { waitUntil: 'networkidle' } : {});
+    await page.getByText('Fetch Nitro $fetch', { exact: true }).click();
+
+    const transaction = await transactionPromise;
+
+    expect(transaction.contexts.trace.op).toBe('http.server');
+
+    if (isDevMode) {
+      expect(transaction.environment).toBe('development');
+    } else {
+      expect(transaction.environment).toBe('production');
+    }
+  });
 });

From 17a2f13ec1a3d90374f33a3f958ceeed86b677da Mon Sep 17 00:00:00 2001
From: s1gr1d <32902192+s1gr1d@users.noreply.github.com>
Date: Wed, 7 Jan 2026 14:57:49 +0100
Subject: [PATCH 6/6] reorder options

---
 packages/nuxt/src/server/sdk.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/nuxt/src/server/sdk.ts b/packages/nuxt/src/server/sdk.ts
index e70d637b6b4b..2621f3f77f9a 100644
--- a/packages/nuxt/src/server/sdk.ts
+++ b/packages/nuxt/src/server/sdk.ts
@@ -26,9 +26,9 @@ import type { SentryNuxtServerOptions } from '../common/types';
  */
 export function init(options: SentryNuxtServerOptions): Client | undefined {
   const sentryOptions = {
-    defaultIntegrations: getNuxtDefaultIntegrations(options),
     environment: !isCjs() && import.meta.dev ? DEV_ENVIRONMENT : DEFAULT_ENVIRONMENT,
     ...options,
+    defaultIntegrations: getNuxtDefaultIntegrations(options),
   };
 
   applySdkMetadata(sentryOptions, 'nuxt', ['nuxt', 'node']);