fix(browser-detector): ensure Node.js v21+ is not detected as browser

experimental/packages/opentelemetry-browser-detector/src/BrowserDetector.ts

@@ -28,7 +28,13 @@ import { BROWSER_ATTRIBUTES, UserAgentData } from './types';
  */
 class BrowserDetector implements ResourceDetector {
   detect(config?: ResourceDetectionConfig): DetectedResource {
-    const isBrowser = typeof navigator !== 'undefined';
+    const isBrowser =
+      typeof navigator !== 'undefined' &&
+      // @ts-ignore
+      globalThis.process?.versions?.node === undefined &&
+      // @ts-ignore
+      globalThis.Bun?.version === undefined;
+
     if (!isBrowser) {
       return emptyResource();
     }

experimental/packages/opentelemetry-browser-detector/test/BrowserDetector.test.ts

@@ -77,3 +77,12 @@ describeBrowser('browserDetector()', () => {
     assertEmptyResource(resource);
   });
 });
+
+describe('browserDetector() in Node.js', () => {
+  it('should return empty resource in Node.js environment even if navigator is present', () => {
+    // We don't need to stub navigator because I am are on Node 24
+    const resource = browserDetector.detect();
+
+    assertEmptyResource(resource);
+  });
+});