fix(tracing): Avoid browser tracing initialization on node environment.

packages/tracing/src/browser/metrics.ts

@@ -1,7 +1,7 @@
 /* eslint-disable max-lines */
 /* eslint-disable @typescript-eslint/no-explicit-any */
 import { Measurements, SpanContext } from '@sentry/types';
-import { browserPerformanceTimeOrigin, getGlobalObject, htmlTreeAsString, logger } from '@sentry/utils';
+import { browserPerformanceTimeOrigin, getGlobalObject, htmlTreeAsString, isNodeEnv, logger } from '@sentry/utils';
 
 import { Span } from '../span';
 import { Transaction } from '../transaction';
@@ -22,7 +22,7 @@ export class MetricsInstrumentation {
   private _lcpEntry: LargestContentfulPaint | undefined;
 
   public constructor() {
-    if (global && global.performance) {
+    if (!isNodeEnv() && global?.performance) {
       if (global.performance.mark) {
         global.performance.mark('sentry-tracing-init');
       }

packages/tracing/test/browser/metrics.test.ts

@@ -1,5 +1,9 @@
 import { Span, Transaction } from '../../src';
-import { _startChild, addResourceSpans, ResourceEntry } from '../../src/browser/metrics';
+import { _startChild, addResourceSpans, MetricsInstrumentation, ResourceEntry } from '../../src/browser/metrics';
+import { addDOMPropertiesToGlobal } from '../testutils';
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any, no-var
+declare var global: any;
 
 describe('_startChild()', () => {
   it('creates a span with given properties', () => {
@@ -167,3 +171,29 @@ describe('addResourceSpans', () => {
     );
   });
 });
+
+describe('MetricsInstrumentation', () => {
+  it('does not initialize trackers when on node', () => {
+    const trackers = ['_trackCLS', '_trackLCP', '_trackFID'].map(tracker =>
+      jest.spyOn(MetricsInstrumentation.prototype as any, tracker),
+    );
+
+    new MetricsInstrumentation();
+
+    trackers.forEach(tracker => expect(tracker).not.toBeCalled());
+  });
+
+  it('initializes trackers when not on node and `global.performance` is available.', () => {
+    addDOMPropertiesToGlobal(['performance', 'document', 'addEventListener', 'window']);
+    const backup = global.process;
+    global.process = undefined;
+
+    const trackers = ['_trackCLS', '_trackLCP', '_trackFID'].map(tracker =>
+      jest.spyOn(MetricsInstrumentation.prototype as any, tracker),
+    );
+    new MetricsInstrumentation();
+    global.process = backup;
+
+    trackers.forEach(tracker => expect(tracker).toBeCalled());
+  });
+});