feat(core): Track CaptureAppStartErrors adoption (#6429)

* feat(core): Track GlobalErrorBoundary adoption

Register a no-op `GlobalErrorBoundary` integration when the
component mounts so the name flows through to
`event.sdk.integrations` — the same channel used for feature-
adoption signals like `MobileFeedback` and `AppStart`.

Also introduces a shared `registerFeatureMarker` helper.
Subsequent markers for other opt-in features
(NavigationContainer, ExpoRouter error boundary, AppLoaded, ...)
will use this helper — see #6415.

Refs: #6415

* feat(core): Track CaptureAppStartErrors adoption

Register a no-op `CaptureAppStartErrors` integration when the
JS runtime detects `sentry.options.json` is bundled (via
`RN_GLOBAL_OBJ.__SENTRY_OPTIONS__`), so the name flows through
to `event.sdk.integrations`.

The Metro serializer already bundles `sentry.options.json` into
the JS bundle as `__SENTRY_OPTIONS__` at build time — shipping
the config is what opts users into the pre-JS crash capture
feature. No native/bridge changes needed.

Refs: #6415

Author: antonis

packages/core/src/js/sdk.tsx

@@ -34,12 +34,15 @@ import {
 import { useEncodePolyfill } from './transports/encodePolyfill';
 import { DEFAULT_BUFFER_SIZE, makeNativeTransportFactory } from './transports/native';
 import { getDefaultEnvironment, isExpoGo, isRunningInMetroDevServer, isWeb } from './utils/environment';
+import { registerFeatureMarker } from './utils/featureMarkers';
 import { getDefaultRelease } from './utils/release';
 import { safeFactory, safeTracesSampler } from './utils/safe';
 import { checkSentryJsSdkVersionMismatch } from './utils/sdkVersionCheck';
 import { RN_GLOBAL_OBJ } from './utils/worldwide';
 import { NATIVE } from './wrapper';
 
+const CAPTURE_APP_START_ERRORS_INTEGRATION_NAME = 'CaptureAppStartErrors';
+
 const DEFAULT_OPTIONS: ReactNativeOptions = {
   enableNativeCrashHandling: true,
   enableNativeNagger: true,
@@ -189,6 +192,10 @@ export function init(passedOptions: ReactNativeOptions): void {
 
   if (RN_GLOBAL_OBJ.__SENTRY_OPTIONS__) {
     debug.log('Sentry JS initialized with options from the options file.');
+    // Adoption marker for the "capture app-start errors" feature: shipping
+    // `sentry.options.json` is what opts users in (the Metro serializer bundles
+    // it into JS as `__SENTRY_OPTIONS__`, and native reads it before JS runs).
+    registerFeatureMarker(CAPTURE_APP_START_ERRORS_INTEGRATION_NAME);
   }
 }
 

packages/core/test/sdk.test.ts

@@ -11,6 +11,7 @@ import { init, withScope } from '../src/js/sdk';
 import { REACT_NATIVE_TRACING_INTEGRATION_NAME, reactNativeTracingIntegration } from '../src/js/tracing';
 import { makeNativeTransport } from '../src/js/transports/native';
 import { getDefaultEnvironment, isExpoGo, notWeb } from '../src/js/utils/environment';
+import { registerFeatureMarker } from '../src/js/utils/featureMarkers';
 import { RN_GLOBAL_OBJ } from '../src/js/utils/worldwide';
 import { NATIVE } from './mockWrapper';
 import { firstArg, secondArg } from './testutils';
@@ -25,6 +26,9 @@ jest.mock('@sentry/core', () => ({
 jest.mock('../src/js/integrations/debugsymbolicatorutils', () => ({
   getDevServer: jest.fn(),
 }));
+jest.mock('../src/js/utils/featureMarkers', () => ({
+  registerFeatureMarker: jest.fn(),
+}));
 
 describe('Tests the SDK functionality', () => {
   beforeEach(() => {
@@ -189,6 +193,18 @@ describe('Tests the SDK functionality', () => {
         });
         expect(usedOptions()?.autoInitializeNativeSdk).toBe(false);
       });
+
+      it('registers the CaptureAppStartErrors marker when __SENTRY_OPTIONS__ is set', () => {
+        RN_GLOBAL_OBJ.__SENTRY_OPTIONS__ = {};
+        init({});
+        expect(registerFeatureMarker).toHaveBeenCalledWith('CaptureAppStartErrors');
+      });
+
+      it('does not register the CaptureAppStartErrors marker without __SENTRY_OPTIONS__', () => {
+        delete RN_GLOBAL_OBJ.__SENTRY_OPTIONS__;
+        init({});
+        expect(registerFeatureMarker).not.toHaveBeenCalledWith('CaptureAppStartErrors');
+      });
     });
 
     describe('environment', () => {