feat(solidstart): Add browserTracingIntegration by default (#13561)

Closes: #13352

Author: andreiborza

packages/solidstart/src/client/sdk.ts

@@ -1,17 +1,42 @@
 import { applySdkMetadata } from '@sentry/core';
 import type { BrowserOptions } from '@sentry/solid';
-import { init as initSolidSDK } from '@sentry/solid';
-import type { Client } from '@sentry/types';
+import {
+  browserTracingIntegration,
+  getDefaultIntegrations as getDefaultSolidIntegrations,
+  init as initSolidSDK,
+} from '@sentry/solid';
+import type { Client, Integration } from '@sentry/types';
+
+// Treeshakable guard to remove all code related to tracing
+declare const __SENTRY_TRACING__: boolean;
 
 /**
  * Initializes the client side of the Solid Start SDK.
  */
 export function init(options: BrowserOptions): Client | undefined {
   const opts = {
+    defaultIntegrations: getDefaultIntegrations(options),
     ...options,
   };
 
   applySdkMetadata(opts, 'solidstart', ['solidstart', 'solid']);
 
   return initSolidSDK(opts);
 }
+
+function getDefaultIntegrations(options: BrowserOptions): Integration[] {
+  const integrations = getDefaultSolidIntegrations(options);
+
+  // This evaluates to true unless __SENTRY_TRACING__ is text-replaced with "false",
+  // in which case everything inside will get tree-shaken away
+  if (typeof __SENTRY_TRACING__ === 'undefined' || __SENTRY_TRACING__) {
+    // We add the default BrowserTracingIntegration here always.
+    // We can do this, even if `solidRouterBrowserTracingIntegration` is
+    // supplied as integration in `init` by users because it will win
+    // over the default integration by virtue of having the same
+    // `BrowserTracing` integration name and being added later.
+    integrations.push(browserTracingIntegration());
+  }
+
+  return integrations;
+}

packages/solidstart/test/client/sdk.test.ts

@@ -3,6 +3,7 @@ import * as SentrySolid from '@sentry/solid';
 
 import { vi } from 'vitest';
 import { init as solidStartInit } from '../../src/client';
+import { solidRouterBrowserTracingIntegration } from '../../src/client/solidrouter';
 
 const browserInit = vi.spyOn(SentrySolid, 'init');
 
@@ -34,3 +35,47 @@ describe('Initialize Solid Start SDK', () => {
     expect(browserInit).toHaveBeenLastCalledWith(expect.objectContaining(expectedMetadata));
   });
 });
+
+describe('browserTracingIntegration', () => {
+  it('adds the `browserTracingIntegration` when `__SENTRY_TRACING__` is not set', () => {
+    const client = solidStartInit({
+      dsn: 'https://public@dsn.ingest.sentry.io/1337',
+    });
+
+    const browserTracingIntegration = client
+      ?.getOptions()
+      .integrations.find(integration => integration.name === 'BrowserTracing');
+    expect(browserTracingIntegration).toBeDefined();
+    expect(browserTracingIntegration!.isDefaultInstance).toEqual(true);
+  });
+
+  it("doesn't add the `browserTracingIntegration` if `__SENTRY_TRACING__` is false", () => {
+    // @ts-expect-error Test setup for build-time flag
+    globalThis.__SENTRY_TRACING__ = false;
+
+    const client = solidStartInit({
+      dsn: 'https://public@dsn.ingest.sentry.io/1337',
+    });
+
+    const browserTracingIntegration = client
+      ?.getOptions()
+      .integrations.find(integration => integration.name === 'BrowserTracing');
+    expect(browserTracingIntegration).toBeUndefined();
+
+    // @ts-expect-error Test setup for build-time flag
+    delete globalThis.__SENTRY_TRACING__;
+  });
+
+  it("doesn't add the default `browserTracingIntegration` if `solidBrowserTracingIntegration` was already passed in", () => {
+    const client = solidStartInit({
+      integrations: [solidRouterBrowserTracingIntegration()],
+      dsn: 'https://public@dsn.ingest.sentry.io/1337',
+    });
+
+    const browserTracingIntegration = client
+      ?.getOptions()
+      .integrations.find(integration => integration.name === 'BrowserTracing');
+    expect(browserTracingIntegration).toBeDefined();
+    expect(browserTracingIntegration!.isDefaultInstance).toBeUndefined();
+  });
+});