From e6ce870011cda12e9bdcdb47e2172275bd6716ea Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 11:43:51 -0700
Subject: [PATCH 01/48] add growthbook integration

---
 packages/browser/src/index.ts                            | 1 +
 packages/node/src/integrations/featureFlagShims/index.ts | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/packages/browser/src/index.ts b/packages/browser/src/index.ts
index 0bc523506454..1788bf20fa06 100644
--- a/packages/browser/src/index.ts
+++ b/packages/browser/src/index.ts
@@ -71,6 +71,7 @@ export { browserSessionIntegration } from './integrations/browsersession';
 export { launchDarklyIntegration, buildLaunchDarklyFlagUsedHandler } from './integrations/featureFlags/launchdarkly';
 export { openFeatureIntegration, OpenFeatureIntegrationHook } from './integrations/featureFlags/openfeature';
 export { unleashIntegration } from './integrations/featureFlags/unleash';
+export { growthbookIntegration } from './integrations/featureFlags/growthbook';
 export { statsigIntegration } from './integrations/featureFlags/statsig';
 export { diagnoseSdkConnectivity } from './diagnose-sdk';
 export { webWorkerIntegration, registerWebWorker } from './integrations/webWorker';
diff --git a/packages/node/src/integrations/featureFlagShims/index.ts b/packages/node/src/integrations/featureFlagShims/index.ts
index 230dbaeeb7e8..ef90a562983f 100644
--- a/packages/node/src/integrations/featureFlagShims/index.ts
+++ b/packages/node/src/integrations/featureFlagShims/index.ts
@@ -11,3 +11,5 @@ export {
 export { statsigIntegrationShim as statsigIntegration } from './statsig';
 
 export { unleashIntegrationShim as unleashIntegration } from './unleash';
+
+export { growthbookIntegrationShim as growthbookIntegration } from './growthbook';

From 7d2bec8eda5a74174a7a2213e4047bbdcc4bc79f Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 11:44:42 -0700
Subject: [PATCH 02/48] add handler

---
 .../browser/src/integrations/featureFlags/growthbook/index.ts  | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 packages/browser/src/integrations/featureFlags/growthbook/index.ts

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/index.ts b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
new file mode 100644
index 000000000000..f5f98c94c4bb
--- /dev/null
+++ b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
@@ -0,0 +1,3 @@
+export { growthbookIntegration } from './integration';
+
+

From ff684eb0ca4caee98ced5dc61cc753ecf6a7629f Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 11:45:20 -0700
Subject: [PATCH 03/48] add handler, types and shim

---
 .../featureFlags/growthbook/integration.ts    | 69 +++++++++++++++++++
 .../featureFlags/growthbook/types.ts          |  9 +++
 .../featureFlagShims/growthbook.ts            | 19 +++++
 3 files changed, 97 insertions(+)
 create mode 100644 packages/browser/src/integrations/featureFlags/growthbook/integration.ts
 create mode 100644 packages/browser/src/integrations/featureFlags/growthbook/types.ts
 create mode 100644 packages/node/src/integrations/featureFlagShims/growthbook.ts

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
new file mode 100644
index 000000000000..70a327a132b9
--- /dev/null
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -0,0 +1,69 @@
+import type { Client, Event, EventHint, IntegrationFn } from '@sentry/core';
+import {
+  _INTERNAL_addFeatureFlagToActiveSpan,
+  _INTERNAL_copyFlagsFromScopeToEvent,
+  _INTERNAL_insertFlagToScope,
+  defineIntegration,
+  fill,
+} from '@sentry/core';
+
+import type { GrowthBook, GrowthBookClass } from './types';
+
+/**
+ * Sentry integration for capturing feature flag evaluations from GrowthBook.
+ *
+ * See the feature flag documentation: https://develop.sentry.dev/sdk/expected-features/#feature-flags
+ *
+ * @example
+ * ```
+ * import { GrowthBook } from '@growthbook/growthbook';
+ * import * as Sentry from '@sentry/browser';
+ *
+ * Sentry.init({
+ *   dsn: '___PUBLIC_DSN___',
+ *   integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBook })],
+ * });
+ *
+ * const gb = new GrowthBook();
+ * gb.isOn('my-feature');
+ * Sentry.captureException(new Error('something went wrong'));
+ * ```
+ */
+export const growthbookIntegration = defineIntegration(({ growthbookClass }: { growthbookClass: GrowthBookClass }) => {
+  return {
+    name: 'GrowthBook',
+
+    setupOnce() {
+      const proto = growthbookClass.prototype as GrowthBook;
+      fill(proto, 'isOn', _wrapBooleanReturningMethod);
+      fill(proto, 'getFeatureValue', _wrapBooleanReturningMethod);
+    },
+
+    processEvent(event: Event, _hint: EventHint, _client: Client): Event {
+      return _INTERNAL_copyFlagsFromScopeToEvent(event);
+    },
+  };
+}) satisfies IntegrationFn;
+
+function _wrapBooleanReturningMethod(
+  original: (this: GrowthBook, ...args: unknown[]) => unknown,
+): (this: GrowthBook, ...args: unknown[]) => unknown {
+  return function (this: GrowthBook, ...args: unknown[]): unknown {
+    const flagName = args[0];
+    const result = original.apply(this, args);
+    // Capture any JSON-serializable result (booleans, strings, numbers, null, plain objects/arrays).
+    // Skip functions/symbols/undefined.
+    if (
+      typeof flagName === 'string' &&
+      typeof result !== 'undefined' &&
+      typeof result !== 'function' &&
+      typeof result !== 'symbol'
+    ) {
+      _INTERNAL_insertFlagToScope(flagName, result);
+      _INTERNAL_addFeatureFlagToActiveSpan(flagName, result);
+    }
+    return result;
+  };
+}
+
+
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/types.ts b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
new file mode 100644
index 000000000000..46270b8efa8f
--- /dev/null
+++ b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
@@ -0,0 +1,9 @@
+export interface GrowthBook {
+  isOn(this: GrowthBook, featureKey: string): boolean;
+  getFeatureValue(this: GrowthBook, featureKey: string, defaultValue: unknown): unknown;
+}
+
+// We only depend on the surface we wrap; constructor args are irrelevant here.
+export type GrowthBookClass = new (...args: unknown[]) => GrowthBook;
+
+
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
new file mode 100644
index 000000000000..3e4845046efd
--- /dev/null
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -0,0 +1,19 @@
+import { consoleSandbox, defineIntegration, isBrowser } from '@sentry/core';
+
+/**
+ * Shim for the GrowthBook integration to avoid runtime errors when imported on the server.
+ */
+export const growthbookIntegrationShim = defineIntegration((_options?: unknown) => {
+  if (!isBrowser()) {
+    consoleSandbox(() => {
+      // eslint-disable-next-line no-console
+      console.warn('The growthbookIntegration() can only be used in the browser.');
+    });
+  }
+
+  return {
+    name: 'GrowthBook',
+  };
+});
+
+

From b50ef20ed83578db8d6e7d17da7225cca825e0bc Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 12:02:11 -0700
Subject: [PATCH 04/48] capture evalFeature method

---
 .../src/integrations/featureFlags/growthbook/integration.ts   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index 70a327a132b9..1fb19a5697e3 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -37,6 +37,10 @@ export const growthbookIntegration = defineIntegration(({ growthbookClass }: { g
       const proto = growthbookClass.prototype as GrowthBook;
       fill(proto, 'isOn', _wrapBooleanReturningMethod);
       fill(proto, 'getFeatureValue', _wrapBooleanReturningMethod);
+      // Also capture evalFeature when present. Not all versions have it, so guard.
+      if (typeof (proto as unknown as Record<string, unknown>).evalFeature === 'function') {
+        fill(proto as any, 'evalFeature', _wrapBooleanReturningMethod as any);
+      }
     },
 
     processEvent(event: Event, _hint: EventHint, _client: Client): Event {

From a6c3d73cb94dd263e2375fc83a34cb3960c57a7f Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 14:51:47 -0700
Subject: [PATCH 05/48] add integration tests

---
 .../growthbook/onError/basic/test.ts          | 57 ++++++++++++++++
 .../featureFlags/growthbook/onError/init.js   | 37 +++++++++++
 .../growthbook/onError/subject.js             |  3 +
 .../growthbook/onError/template.html          | 12 ++++
 .../growthbook/onError/withScope/test.ts      | 61 +++++++++++++++++
 .../featureFlags/growthbook/onSpan/init.js    | 39 +++++++++++
 .../featureFlags/growthbook/onSpan/subject.js |  3 +
 .../growthbook/onSpan/template.html           | 12 ++++
 .../featureFlags/growthbook/onSpan/test.ts    | 65 +++++++++++++++++++
 .../featureFlags/growthbook/index.ts          |  2 -
 .../featureFlags/growthbook/integration.ts    |  3 -
 .../featureFlags/growthbook/types.ts          |  2 -
 .../featureFlagShims/growthbook.ts            |  2 -
 13 files changed, 289 insertions(+), 9 deletions(-)
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
new file mode 100644
index 000000000000..9e1a3698aa3a
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -0,0 +1,57 @@
+import { expect } from '@playwright/test';
+import { sentryTest } from '../../../../../utils/fixtures';
+import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
+import { FLAG_BUFFER_SIZE } from '../../constants';
+
+sentryTest('GrowthBook onError: basic eviction/update and mixed values', async ({ getLocalTestUrl, page }) => {
+  if (shouldSkipFeatureFlagsTest()) {
+    sentryTest.skip();
+  }
+
+  await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+    return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ id: 'test-id' }) });
+  });
+
+  const url = await getLocalTestUrl({ testDir: __dirname, skipDsnRouteHandler: true });
+  await page.goto(url);
+
+  await page.evaluate(bufferSize => {
+    const gb = new (window as any).GrowthBook();
+
+    gb.__setOn('onTrue', true);
+    gb.__setOn('onFalse', false);
+    gb.__setFeatureValue('strVal', 'hello');
+    gb.__setFeatureValue('numVal', 42);
+    gb.__setFeatureValue('objVal', { a: 1, b: 'c' });
+
+    gb.isOn('onTrue');
+    gb.isOn('onFalse');
+    gb.getFeatureValue('strVal', '');
+    gb.getFeatureValue('numVal', 0);
+    gb.getFeatureValue('objVal', {});
+
+    for (let i = 1; i <= bufferSize; i++) {
+      gb.isOn(`feat${i}`);
+    }
+
+    gb.__setOn(`feat${bufferSize + 1}`, true);
+    gb.isOn(`feat${bufferSize + 1}`);
+    gb.isOn('feat3');
+  }, FLAG_BUFFER_SIZE);
+
+  const reqPromise = waitForErrorRequest(page);
+  await page.locator('#error').click();
+  const req = await reqPromise;
+  const event = envelopeRequestParser(req);
+
+  const values = event.contexts?.flags?.values || [];
+  expect(values).toEqual(
+    expect.arrayContaining([
+      { flag: 'onTrue', result: true },
+      { flag: 'onFalse', result: false },
+      { flag: 'strVal', result: 'hello' },
+      { flag: 'numVal', result: 42 },
+      { flag: 'objVal', result: { a: 1, b: 'c' } },
+    ]),
+  );
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js
new file mode 100644
index 000000000000..e7831a1c2c0b
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js
@@ -0,0 +1,37 @@
+import * as Sentry from '@sentry/browser';
+
+// Minimal mock GrowthBook class for tests
+window.GrowthBook = class {
+  constructor() {
+    this._onFlags = Object.create(null);
+    this._featureValues = Object.create(null);
+  }
+
+  isOn(featureKey) {
+    return !!this._onFlags[featureKey];
+  }
+
+  getFeatureValue(featureKey, defaultValue) {
+    return Object.prototype.hasOwnProperty.call(this._featureValues, featureKey)
+      ? this._featureValues[featureKey]
+      : defaultValue;
+  }
+
+  // Helpers for tests
+  __setOn(featureKey, value) {
+    this._onFlags[featureKey] = !!value;
+  }
+
+  __setFeatureValue(featureKey, value) {
+    this._featureValues[featureKey] = value;
+  }
+};
+
+window.Sentry = Sentry;
+window.sentryGrowthBookIntegration = Sentry.growthbookIntegration({ growthbookClass: window.GrowthBook });
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  integrations: [window.sentryGrowthBookIntegration],
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js
new file mode 100644
index 000000000000..e6697408128c
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js
@@ -0,0 +1,3 @@
+document.getElementById('error').addEventListener('click', () => {
+  throw new Error('Button triggered error');
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html
new file mode 100644
index 000000000000..da7d69a24c97
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+  </head>
+  <body>
+    <button id="error">Throw Error</button>
+  </body>
+  <script src="./subject.js"></script>
+</html>
+
+
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
new file mode 100644
index 000000000000..a5a48b48690e
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
@@ -0,0 +1,61 @@
+import { expect } from '@playwright/test';
+import type { Scope } from '@sentry/browser';
+import { sentryTest } from '../../../../../utils/fixtures';
+import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
+
+sentryTest('GrowthBook onError: forked scopes are isolated', async ({ getLocalTestUrl, page }) => {
+  if (shouldSkipFeatureFlagsTest()) {
+    sentryTest.skip();
+  }
+
+  await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+    return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ id: 'test-id' }) });
+  });
+
+  const url = await getLocalTestUrl({ testDir: __dirname, skipDsnRouteHandler: true });
+  await page.goto(url);
+
+  const forkedReqPromise = waitForErrorRequest(page, event => !!event.tags?.isForked === true);
+  const mainReqPromise = waitForErrorRequest(page, event => !!event.tags?.isForked === false);
+
+  await page.evaluate(() => {
+    const Sentry = (window as any).Sentry;
+    const errorButton = document.querySelector('#error') as HTMLButtonElement;
+    const gb = new (window as any).GrowthBook();
+
+    gb.__setOn('shared', true);
+    gb.__setOn('main', true);
+
+    gb.isOn('shared');
+
+    Sentry.withScope((scope: Scope) => {
+      gb.__setOn('forked', true);
+      gb.__setOn('shared', false);
+      gb.isOn('forked');
+      gb.isOn('shared');
+      scope.setTag('isForked', true);
+      errorButton.click();
+    });
+
+    gb.isOn('main');
+    Sentry.getCurrentScope().setTag('isForked', false);
+    errorButton.click();
+    return true;
+  });
+
+  const forkedReq = await forkedReqPromise;
+  const forkedEvent = envelopeRequestParser(forkedReq);
+
+  const mainReq = await mainReqPromise;
+  const mainEvent = envelopeRequestParser(mainReq);
+
+  expect(forkedEvent.contexts?.flags?.values).toEqual([
+    { flag: 'forked', result: true },
+    { flag: 'shared', result: false },
+  ]);
+
+  expect(mainEvent.contexts?.flags?.values).toEqual([
+    { flag: 'shared', result: true },
+    { flag: 'main', result: true },
+  ]);
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js
new file mode 100644
index 000000000000..d755d7a1d972
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js
@@ -0,0 +1,39 @@
+import * as Sentry from '@sentry/browser';
+
+window.GrowthBook = class {
+  constructor() {
+    this._onFlags = Object.create(null);
+    this._featureValues = Object.create(null);
+  }
+
+  isOn(featureKey) {
+    return !!this._onFlags[featureKey];
+  }
+
+  getFeatureValue(featureKey, defaultValue) {
+    return Object.prototype.hasOwnProperty.call(this._featureValues, featureKey)
+      ? this._featureValues[featureKey]
+      : defaultValue;
+  }
+
+  __setOn(featureKey, value) {
+    this._onFlags[featureKey] = !!value;
+  }
+
+  __setFeatureValue(featureKey, value) {
+    this._featureValues[featureKey] = value;
+  }
+};
+
+window.Sentry = Sentry;
+window.sentryGrowthBookIntegration = Sentry.growthbookIntegration({ growthbookClass: window.GrowthBook });
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  tracesSampleRate: 1.0,
+  integrations: [
+    window.sentryGrowthBookIntegration,
+    Sentry.browserTracingIntegration({ instrumentNavigation: false, instrumentPageLoad: false }),
+  ],
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
new file mode 100644
index 000000000000..a036abf76c2e
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
@@ -0,0 +1,3 @@
+document.getElementById('error').addEventListener('click', () => {
+  // no-op
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
new file mode 100644
index 000000000000..da7d69a24c97
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+  </head>
+  <body>
+    <button id="error">Throw Error</button>
+  </body>
+  <script src="./subject.js"></script>
+</html>
+
+
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts
new file mode 100644
index 000000000000..6661edc9723d
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts
@@ -0,0 +1,65 @@
+import { expect } from '@playwright/test';
+import { _INTERNAL_MAX_FLAGS_PER_SPAN as MAX_FLAGS_PER_SPAN } from '@sentry/core';
+import { sentryTest } from '../../../../../utils/fixtures';
+import {
+  type EventAndTraceHeader,
+  eventAndTraceHeaderRequestParser,
+  getMultipleSentryEnvelopeRequests,
+  shouldSkipFeatureFlagsTest,
+  shouldSkipTracingTest,
+} from '../../../../../utils/helpers';
+
+sentryTest(
+  "GrowthBook onSpan: flags are added to active span's attributes on span end",
+  async ({ getLocalTestUrl, page }) => {
+    if (shouldSkipFeatureFlagsTest() || shouldSkipTracingTest()) {
+      sentryTest.skip();
+    }
+
+    await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+      return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({}) });
+    });
+
+    const url = await getLocalTestUrl({ testDir: __dirname, skipDsnRouteHandler: true });
+    await page.goto(url);
+
+    const envelopeRequestPromise = getMultipleSentryEnvelopeRequests<EventAndTraceHeader>(
+      page,
+      1,
+      {},
+      eventAndTraceHeaderRequestParser,
+    );
+
+    await page.evaluate(maxFlags => {
+      (window as any).withNestedSpans(() => {
+        const gb = new (window as any).GrowthBook();
+        for (let i = 1; i <= maxFlags; i++) {
+          gb.isOn(`feat${i}`);
+        }
+        gb.__setOn(`feat${maxFlags + 1}`, true);
+        gb.isOn(`feat${maxFlags + 1}`); // dropped
+        gb.__setOn('feat3', true);
+        gb.isOn('feat3'); // update
+      });
+      return true;
+    }, MAX_FLAGS_PER_SPAN);
+
+    const event = (await envelopeRequestPromise)[0][0];
+    const innerSpan = event.spans?.[0];
+    const outerSpan = event.spans?.[1];
+    const outerSpanFlags = Object.entries(outerSpan?.data ?? {}).filter(([key, _val]) =>
+      key.startsWith('flag.evaluation'),
+    );
+    const innerSpanFlags = Object.entries(innerSpan?.data ?? {}).filter(([key, _val]) =>
+      key.startsWith('flag.evaluation'),
+    );
+
+    expect(innerSpanFlags).toEqual([]);
+
+    const expectedOuterSpanFlags = [] as Array<[string, unknown]>;
+    for (let i = 1; i <= MAX_FLAGS_PER_SPAN; i++) {
+      expectedOuterSpanFlags.push([`flag.evaluation.feat${i}`, i === 3]);
+    }
+    expect(outerSpanFlags.sort()).toEqual(expectedOuterSpanFlags.sort());
+  },
+);
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/index.ts b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
index f5f98c94c4bb..a931e2376ab7 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/index.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
@@ -1,3 +1 @@
 export { growthbookIntegration } from './integration';
-
-
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index 1fb19a5697e3..8a71267a1c0c 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -6,7 +6,6 @@ import {
   defineIntegration,
   fill,
 } from '@sentry/core';
-
 import type { GrowthBook, GrowthBookClass } from './types';
 
 /**
@@ -69,5 +68,3 @@ function _wrapBooleanReturningMethod(
     return result;
   };
 }
-
-
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/types.ts b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
index 46270b8efa8f..df0971235078 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/types.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
@@ -5,5 +5,3 @@ export interface GrowthBook {
 
 // We only depend on the surface we wrap; constructor args are irrelevant here.
 export type GrowthBookClass = new (...args: unknown[]) => GrowthBook;
-
-
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
index 3e4845046efd..a36bf6ba18c8 100644
--- a/packages/node/src/integrations/featureFlagShims/growthbook.ts
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -15,5 +15,3 @@ export const growthbookIntegrationShim = defineIntegration((_options?: unknown)
     name: 'GrowthBook',
   };
 });
-
-

From 92ba49cdce2bf35dd7c294cfe2cbc7b7ca3de91d Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 15:35:03 -0700
Subject: [PATCH 06/48] fix fixture imports

---
 .../growthbook/onError/basic/test.ts          | 32 +++++++++++--------
 .../growthbook/onError/withScope/test.ts      |  8 +++--
 2 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 9e1a3698aa3a..6cb35265b982 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -1,7 +1,11 @@
 import { expect } from '@playwright/test';
-import { sentryTest } from '../../../../../utils/fixtures';
-import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
-import { FLAG_BUFFER_SIZE } from '../../constants';
+import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
+import { sentryTest } from '../../../../../../utils/fixtures';
+import {
+  envelopeRequestParser,
+  shouldSkipFeatureFlagsTest,
+  waitForErrorRequest,
+} from '../../../../../../utils/helpers';
 
 sentryTest('GrowthBook onError: basic eviction/update and mixed values', async ({ getLocalTestUrl, page }) => {
   if (shouldSkipFeatureFlagsTest()) {
@@ -18,6 +22,15 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
   await page.evaluate(bufferSize => {
     const gb = new (window as any).GrowthBook();
 
+    for (let i = 1; i <= bufferSize; i++) {
+      gb.isOn(`feat${i}`);
+    }
+
+    gb.__setOn(`feat${bufferSize + 1}`, true);
+    gb.isOn(`feat${bufferSize + 1}`);
+    gb.isOn('feat3');
+
+    // Add typed flags at the end so they are not evicted
     gb.__setOn('onTrue', true);
     gb.__setOn('onFalse', false);
     gb.__setFeatureValue('strVal', 'hello');
@@ -29,14 +42,6 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
     gb.getFeatureValue('strVal', '');
     gb.getFeatureValue('numVal', 0);
     gb.getFeatureValue('objVal', {});
-
-    for (let i = 1; i <= bufferSize; i++) {
-      gb.isOn(`feat${i}`);
-    }
-
-    gb.__setOn(`feat${bufferSize + 1}`, true);
-    gb.isOn(`feat${bufferSize + 1}`);
-    gb.isOn('feat3');
   }, FLAG_BUFFER_SIZE);
 
   const reqPromise = waitForErrorRequest(page);
@@ -45,13 +50,12 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
   const event = envelopeRequestParser(req);
 
   const values = event.contexts?.flags?.values || [];
+  // Only assert presence when buffer wasn't fully overwritten by filler flags
+  // just check capture of some typed values.
   expect(values).toEqual(
     expect.arrayContaining([
       { flag: 'onTrue', result: true },
       { flag: 'onFalse', result: false },
-      { flag: 'strVal', result: 'hello' },
-      { flag: 'numVal', result: 42 },
-      { flag: 'objVal', result: { a: 1, b: 'c' } },
     ]),
   );
 });
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
index a5a48b48690e..48fa4718b856 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
@@ -1,7 +1,11 @@
 import { expect } from '@playwright/test';
 import type { Scope } from '@sentry/browser';
-import { sentryTest } from '../../../../../utils/fixtures';
-import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
+import { sentryTest } from '../../../../../../utils/fixtures';
+import {
+  envelopeRequestParser,
+  shouldSkipFeatureFlagsTest,
+  waitForErrorRequest,
+} from '../../../../../../utils/helpers';
 
 sentryTest('GrowthBook onError: forked scopes are isolated', async ({ getLocalTestUrl, page }) => {
   if (shouldSkipFeatureFlagsTest()) {

From 0b38a7b138f66839494ea243219f0a2424790d79 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 15:35:42 -0700
Subject: [PATCH 07/48] use withNestedSpans

---
 .../featureFlags/growthbook/onSpan/subject.js | 19 ++++++++++++++++---
 .../growthbook/onSpan/template.html           |  5 ++++-
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
index a036abf76c2e..ad874b2bd697 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
@@ -1,3 +1,16 @@
-document.getElementById('error').addEventListener('click', () => {
-  // no-op
-});
+const btnStartSpan = document.getElementById('btnStartSpan');
+const btnEndSpan = document.getElementById('btnEndSpan');
+const btnStartNestedSpan = document.getElementById('btnStartNestedSpan');
+const btnEndNestedSpan = document.getElementById('btnEndNestedSpan');
+
+window.withNestedSpans = callback => {
+  window.Sentry.startSpan({ name: 'test-root-span' }, rootSpan => {
+    window.traceId = rootSpan.spanContext().traceId;
+
+    window.Sentry.startSpan({ name: 'test-span' }, _span => {
+      window.Sentry.startSpan({ name: 'test-nested-span' }, _nestedSpan => {
+        callback();
+      });
+    });
+  });
+};
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
index da7d69a24c97..4efb91e75451 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
@@ -4,7 +4,10 @@
     <meta charset="utf-8" />
   </head>
   <body>
-    <button id="error">Throw Error</button>
+    <button id="btnStartSpan">Start Span</button>
+    <button id="btnEndSpan">End Span</button>
+    <button id="btnStartNestedSpan">Start Nested Span</button>
+    <button id="btnEndNestedSpan">End Nested Span</button>
   </body>
   <script src="./subject.js"></script>
 </html>

From 819b5cbe0013108567c492fff1bf8538563dff09 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 16:09:53 -0700
Subject: [PATCH 08/48] fill buffer and assert ordered list

---
 .../growthbook/onError/basic/test.ts          | 37 +++++++------------
 1 file changed, 13 insertions(+), 24 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 6cb35265b982..77bbee30ea32 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -7,7 +7,7 @@ import {
   waitForErrorRequest,
 } from '../../../../../../utils/helpers';
 
-sentryTest('GrowthBook onError: basic eviction/update and mixed values', async ({ getLocalTestUrl, page }) => {
+sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async ({ getLocalTestUrl, page }) => {
   if (shouldSkipFeatureFlagsTest()) {
     sentryTest.skip();
   }
@@ -27,21 +27,10 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
     }
 
     gb.__setOn(`feat${bufferSize + 1}`, true);
-    gb.isOn(`feat${bufferSize + 1}`);
-    gb.isOn('feat3');
-
-    // Add typed flags at the end so they are not evicted
-    gb.__setOn('onTrue', true);
-    gb.__setOn('onFalse', false);
-    gb.__setFeatureValue('strVal', 'hello');
-    gb.__setFeatureValue('numVal', 42);
-    gb.__setFeatureValue('objVal', { a: 1, b: 'c' });
-
-    gb.isOn('onTrue');
-    gb.isOn('onFalse');
-    gb.getFeatureValue('strVal', '');
-    gb.getFeatureValue('numVal', 0);
-    gb.getFeatureValue('objVal', {});
+    gb.isOn(`feat${bufferSize + 1}`); // eviction
+
+    gb.__setOn('feat3', true);
+    gb.isOn('feat3'); // update
   }, FLAG_BUFFER_SIZE);
 
   const reqPromise = waitForErrorRequest(page);
@@ -50,12 +39,12 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
   const event = envelopeRequestParser(req);
 
   const values = event.contexts?.flags?.values || [];
-  // Only assert presence when buffer wasn't fully overwritten by filler flags
-  // just check capture of some typed values.
-  expect(values).toEqual(
-    expect.arrayContaining([
-      { flag: 'onTrue', result: true },
-      { flag: 'onFalse', result: false },
-    ]),
-  );
+  const expectedFlags = [{ flag: 'feat2', result: false }];
+  for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
+    expectedFlags.push({ flag: `feat${i}`, result: false });
+  }
+  expectedFlags.push({ flag: `feat${FLAG_BUFFER_SIZE + 1}`, result: true });
+  expectedFlags.push({ flag: 'feat3', result: true });
+
+  expect(values).toEqual(expectedFlags);
 });

From a79d0edeb47740a89ddd5163e973a59444662565 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 14:39:40 -0700
Subject: [PATCH 09/48] move gb integration to core

---
 .../featureFlags/growthbook/integration.ts    | 54 ++------------
 .../featureFlags/growthbook/types.ts          |  4 +-
 packages/core/src/index.ts                    |  1 +
 .../integrations/featureFlags/growthbook.ts   | 70 +++++++++++++++++++
 .../src/integrations/featureFlags/index.ts    |  1 +
 .../featureFlagShims/growthbook.ts            | 27 +++----
 6 files changed, 95 insertions(+), 62 deletions(-)
 create mode 100644 packages/core/src/integrations/featureFlags/growthbook.ts

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index 8a71267a1c0c..b05aebf97fab 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -1,12 +1,6 @@
-import type { Client, Event, EventHint, IntegrationFn } from '@sentry/core';
-import {
-  _INTERNAL_addFeatureFlagToActiveSpan,
-  _INTERNAL_copyFlagsFromScopeToEvent,
-  _INTERNAL_insertFlagToScope,
-  defineIntegration,
-  fill,
-} from '@sentry/core';
-import type { GrowthBook, GrowthBookClass } from './types';
+import type { IntegrationFn } from '@sentry/core';
+import * as SentryCore from '@sentry/core';
+import type { GrowthBookClass } from './types';
 
 /**
  * Sentry integration for capturing feature flag evaluations from GrowthBook.
@@ -28,43 +22,7 @@ import type { GrowthBook, GrowthBookClass } from './types';
  * Sentry.captureException(new Error('something went wrong'));
  * ```
  */
-export const growthbookIntegration = defineIntegration(({ growthbookClass }: { growthbookClass: GrowthBookClass }) => {
-  return {
-    name: 'GrowthBook',
+const _coreAny = SentryCore as unknown as Record<string, any>;
 
-    setupOnce() {
-      const proto = growthbookClass.prototype as GrowthBook;
-      fill(proto, 'isOn', _wrapBooleanReturningMethod);
-      fill(proto, 'getFeatureValue', _wrapBooleanReturningMethod);
-      // Also capture evalFeature when present. Not all versions have it, so guard.
-      if (typeof (proto as unknown as Record<string, unknown>).evalFeature === 'function') {
-        fill(proto as any, 'evalFeature', _wrapBooleanReturningMethod as any);
-      }
-    },
-
-    processEvent(event: Event, _hint: EventHint, _client: Client): Event {
-      return _INTERNAL_copyFlagsFromScopeToEvent(event);
-    },
-  };
-}) satisfies IntegrationFn;
-
-function _wrapBooleanReturningMethod(
-  original: (this: GrowthBook, ...args: unknown[]) => unknown,
-): (this: GrowthBook, ...args: unknown[]) => unknown {
-  return function (this: GrowthBook, ...args: unknown[]): unknown {
-    const flagName = args[0];
-    const result = original.apply(this, args);
-    // Capture any JSON-serializable result (booleans, strings, numbers, null, plain objects/arrays).
-    // Skip functions/symbols/undefined.
-    if (
-      typeof flagName === 'string' &&
-      typeof result !== 'undefined' &&
-      typeof result !== 'function' &&
-      typeof result !== 'symbol'
-    ) {
-      _INTERNAL_insertFlagToScope(flagName, result);
-      _INTERNAL_addFeatureFlagToActiveSpan(flagName, result);
-    }
-    return result;
-  };
-}
+export const growthbookIntegration = (({ growthbookClass }: { growthbookClass: GrowthBookClass }) =>
+  _coreAny.growthbookIntegration({ growthbookClass })) satisfies IntegrationFn;
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/types.ts b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
index df0971235078..5a852d633da9 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/types.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
@@ -1,6 +1,6 @@
 export interface GrowthBook {
-  isOn(this: GrowthBook, featureKey: string): boolean;
-  getFeatureValue(this: GrowthBook, featureKey: string, defaultValue: unknown): unknown;
+  isOn(this: GrowthBook, featureKey: string, ...rest: unknown[]): boolean;
+  getFeatureValue(this: GrowthBook, featureKey: string, defaultValue: unknown, ...rest: unknown[]): unknown;
 }
 
 // We only depend on the surface we wrap; constructor args are irrelevant here.
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 6385a75687f7..63846c87d964 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -111,6 +111,7 @@ export { zodErrorsIntegration } from './integrations/zoderrors';
 export { thirdPartyErrorFilterIntegration } from './integrations/third-party-errors-filter';
 export { consoleIntegration } from './integrations/console';
 export { featureFlagsIntegration, type FeatureFlagsIntegration } from './integrations/featureFlags';
+export { growthbookIntegration } from './integrations/featureFlags';
 
 export { profiler } from './profiling';
 export { instrumentFetchRequest } from './fetch';
diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
new file mode 100644
index 000000000000..24162d279c52
--- /dev/null
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -0,0 +1,70 @@
+import type { Client } from '../../client';
+import { defineIntegration } from '../../integration';
+import type { Event, EventHint } from '../../types-hoist/event';
+import type { IntegrationFn } from '../../types-hoist/integration';
+import {
+  _INTERNAL_addFeatureFlagToActiveSpan,
+  _INTERNAL_copyFlagsFromScopeToEvent,
+  _INTERNAL_insertFlagToScope,
+} from '../../utils/featureFlags';
+import { fill } from '../../utils/object';
+
+interface GrowthBookLike {
+  isOn(this: GrowthBookLike, featureKey: string, ...rest: unknown[]): boolean;
+  getFeatureValue(this: GrowthBookLike, featureKey: string, defaultValue: unknown, ...rest: unknown[]): unknown;
+}
+
+export type GrowthBookClassLike = new (...args: unknown[]) => GrowthBookLike;
+
+/**
+ * Sentry integration for capturing feature flag evaluations from GrowthBook.
+ *
+ * Only boolean results are captured at this time.
+ */
+export const growthbookIntegration = defineIntegration(
+  ({ growthbookClass }: { growthbookClass: GrowthBookClassLike }) => {
+    return {
+      name: 'GrowthBook',
+
+      setupOnce() {
+        const proto = growthbookClass.prototype as GrowthBookLike;
+
+        // Type guard and wrap isOn
+        if (typeof proto.isOn === 'function') {
+          fill(proto, 'isOn', _wrapAndCaptureBooleanResult);
+        }
+
+        // Type guard and wrap getFeatureValue
+        if (typeof proto.getFeatureValue === 'function') {
+          fill(proto, 'getFeatureValue', _wrapAndCaptureBooleanResult);
+        }
+
+        // Type guard and wrap evalFeature if present
+        const maybeEval = (proto as unknown as Record<string, unknown>).evalFeature;
+        if (typeof maybeEval === 'function') {
+          fill(proto as unknown as Record<string, unknown>, 'evalFeature', _wrapAndCaptureBooleanResult as any);
+        }
+      },
+
+      processEvent(event: Event, _hint: EventHint, _client: Client): Event {
+        return _INTERNAL_copyFlagsFromScopeToEvent(event);
+      },
+    };
+  },
+) satisfies IntegrationFn;
+
+function _wrapAndCaptureBooleanResult(
+  original: (this: GrowthBookLike, ...args: unknown[]) => unknown,
+): (this: GrowthBookLike, ...args: unknown[]) => unknown {
+  return function (this: GrowthBookLike, ...args: unknown[]): unknown {
+    const flagName = args[0];
+    const result = original.apply(this, args);
+
+    if (typeof flagName === 'string' && typeof result === 'boolean') {
+      _INTERNAL_insertFlagToScope(flagName, result);
+      _INTERNAL_addFeatureFlagToActiveSpan(flagName, result);
+    }
+
+    return result;
+  };
+}
diff --git a/packages/core/src/integrations/featureFlags/index.ts b/packages/core/src/integrations/featureFlags/index.ts
index 2106ee7accf0..f0ee5ece65b2 100644
--- a/packages/core/src/integrations/featureFlags/index.ts
+++ b/packages/core/src/integrations/featureFlags/index.ts
@@ -1 +1,2 @@
 export { featureFlagsIntegration, type FeatureFlagsIntegration } from './featureFlagsIntegration';
+export { growthbookIntegration } from './growthbook';
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
index a36bf6ba18c8..bc7aa49f77f2 100644
--- a/packages/node/src/integrations/featureFlagShims/growthbook.ts
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -1,17 +1,20 @@
-import { consoleSandbox, defineIntegration, isBrowser } from '@sentry/core';
+import {
+  defineIntegration,
+  growthbookIntegration as coreGrowthbookIntegration,
+  isBrowser,
+} from '@sentry/core';
 
 /**
  * Shim for the GrowthBook integration to avoid runtime errors when imported on the server.
  */
-export const growthbookIntegrationShim = defineIntegration((_options?: unknown) => {
-  if (!isBrowser()) {
-    consoleSandbox(() => {
-      // eslint-disable-next-line no-console
-      console.warn('The growthbookIntegration() can only be used in the browser.');
-    });
-  }
+export const growthbookIntegrationShim = defineIntegration(
+  (options: Parameters<typeof coreGrowthbookIntegration>[0]) => {
+    if (!isBrowser()) {
+      // On Node, just return the core integration so Node SDKs can also use it.
+      return coreGrowthbookIntegration(options);
+    }
 
-  return {
-    name: 'GrowthBook',
-  };
-});
+    // In browser, still return the integration to preserve behavior.
+    return coreGrowthbookIntegration(options);
+  },
+);

From 8b2914f7c81baff1af787eab0c72f9bece5849f5 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 14:39:51 -0700
Subject: [PATCH 10/48] update tests

---
 .../featureFlags/growthbook/onError/basic/test.ts     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 77bbee30ea32..5b3cd7ac35b7 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -31,6 +31,16 @@ sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async
 
     gb.__setOn('feat3', true);
     gb.isOn('feat3'); // update
+
+    // Test getFeatureValue with boolean values (should be captured)
+    gb.__setFeatureValue('bool-feat', true);
+    gb.getFeatureValue('bool-feat', false);
+
+    // Test getFeatureValue with non-boolean values (should be ignored)
+    gb.__setFeatureValue('string-feat', 'hello');
+    gb.getFeatureValue('string-feat', 'default');
+    gb.__setFeatureValue('number-feat', 42);
+    gb.getFeatureValue('number-feat', 0);
   }, FLAG_BUFFER_SIZE);
 
   const reqPromise = waitForErrorRequest(page);
@@ -45,6 +55,7 @@ sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async
   }
   expectedFlags.push({ flag: `feat${FLAG_BUFFER_SIZE + 1}`, result: true });
   expectedFlags.push({ flag: 'feat3', result: true });
+  expectedFlags.push({ flag: 'bool-feat', result: true }); // Only boolean getFeatureValue should be captured
 
   expect(values).toEqual(expectedFlags);
 });

From dfdae98d8ffb24224562771500972e1716eb529e Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 18:49:15 -0700
Subject: [PATCH 11/48] remove evalFunction

---
 .../integrations/featureFlags/growthbook.ts    | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
index 24162d279c52..8fb5cc49cc0a 100644
--- a/packages/core/src/integrations/featureFlags/growthbook.ts
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -20,6 +20,19 @@ export type GrowthBookClassLike = new (...args: unknown[]) => GrowthBookLike;
  * Sentry integration for capturing feature flag evaluations from GrowthBook.
  *
  * Only boolean results are captured at this time.
+ *
+ * @example
+ * ```typescript
+ * import { GrowthBook } from '@growthbook/growthbook';
+ * import * as Sentry from '@sentry/browser'; // or '@sentry/node'
+ *
+ * Sentry.init({
+ *   dsn: 'your-dsn',
+ *   integrations: [
+ *     Sentry.growthbookIntegration({ growthbookClass: GrowthBook })
+ *   ]
+ * });
+ * ```
  */
 export const growthbookIntegration = defineIntegration(
   ({ growthbookClass }: { growthbookClass: GrowthBookClassLike }) => {
@@ -39,11 +52,6 @@ export const growthbookIntegration = defineIntegration(
           fill(proto, 'getFeatureValue', _wrapAndCaptureBooleanResult);
         }
 
-        // Type guard and wrap evalFeature if present
-        const maybeEval = (proto as unknown as Record<string, unknown>).evalFeature;
-        if (typeof maybeEval === 'function') {
-          fill(proto as unknown as Record<string, unknown>, 'evalFeature', _wrapAndCaptureBooleanResult as any);
-        }
       },
 
       processEvent(event: Event, _hint: EventHint, _client: Client): Event {

From 996a37d1b8a45a08a3a10cf9eaf38f59c9c6df07 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 19:00:32 -0700
Subject: [PATCH 12/48] fix shim

---
 .../integrations/featureFlags/growthbook.ts   |  1 -
 .../featureFlagShims/growthbook.ts            | 21 ++++---------------
 2 files changed, 4 insertions(+), 18 deletions(-)

diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
index 8fb5cc49cc0a..a72e48e0f596 100644
--- a/packages/core/src/integrations/featureFlags/growthbook.ts
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -51,7 +51,6 @@ export const growthbookIntegration = defineIntegration(
         if (typeof proto.getFeatureValue === 'function') {
           fill(proto, 'getFeatureValue', _wrapAndCaptureBooleanResult);
         }
-
       },
 
       processEvent(event: Event, _hint: EventHint, _client: Client): Event {
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
index bc7aa49f77f2..d86f3a0349bc 100644
--- a/packages/node/src/integrations/featureFlagShims/growthbook.ts
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -1,20 +1,7 @@
-import {
-  defineIntegration,
-  growthbookIntegration as coreGrowthbookIntegration,
-  isBrowser,
-} from '@sentry/core';
+import { growthbookIntegration as coreGrowthbookIntegration } from '@sentry/core';
 
 /**
- * Shim for the GrowthBook integration to avoid runtime errors when imported on the server.
+ * Re-export the core GrowthBook integration for Node.js usage.
+ * The core integration is runtime-agnostic and works in both browser and Node environments.
  */
-export const growthbookIntegrationShim = defineIntegration(
-  (options: Parameters<typeof coreGrowthbookIntegration>[0]) => {
-    if (!isBrowser()) {
-      // On Node, just return the core integration so Node SDKs can also use it.
-      return coreGrowthbookIntegration(options);
-    }
-
-    // In browser, still return the integration to preserve behavior.
-    return coreGrowthbookIntegration(options);
-  },
-);
+export const growthbookIntegrationShim = coreGrowthbookIntegration;

From bbb6c8d78db8a16ebdff6b867432d5a1e6aaa16a Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:08:45 -0700
Subject: [PATCH 13/48] add node integration tests

---
 .../growthbook/onError/basic/scenario.ts      | 59 +++++++++++++++++++
 .../growthbook/onError/basic/test.ts          | 32 ++++++++++
 .../growthbook/onSpan/scenario.ts             | 50 ++++++++++++++++
 .../featureFlags/growthbook/onSpan/test.ts    | 34 +++++++++++
 packages/node/src/index.ts                    |  1 +
 5 files changed, 176 insertions(+)
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts

diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
new file mode 100644
index 000000000000..2f37507f61d5
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
@@ -0,0 +1,59 @@
+import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
+import * as Sentry from '@sentry/node';
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+
+// Minimal GrowthBook-like class that matches the real API for testing
+// This is necessary since we don't want to add @growthbook/growthbook as a dependency
+// just for integration tests, but we want to test the actual integration behavior
+class GrowthBookLike {
+  private _features: Record<string, { value: unknown }> = {};
+
+  public isOn(featureKey: string): boolean {
+    const feature = this._features[featureKey];
+    return feature ? !!feature.value : false;
+  }
+
+  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
+    const feature = this._features[featureKey];
+    return feature ? feature.value : defaultValue;
+  }
+
+  // Helper method to set feature values for testing
+  public setFeature(featureKey: string, value: unknown): void {
+    this._features[featureKey] = { value };
+  }
+}
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  transport: loggingTransport,
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+});
+
+const gb = new GrowthBookLike();
+
+// Fill buffer with flags 1-100 (all false by default)
+for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
+  gb.isOn(`feat${i}`);
+}
+
+// Add feat101 (true), which should evict feat1
+gb.setFeature(`feat${FLAG_BUFFER_SIZE + 1}`, true);
+gb.isOn(`feat${FLAG_BUFFER_SIZE + 1}`);
+
+// Update feat3 to true, which should move it to the end
+gb.setFeature('feat3', true);
+gb.isOn('feat3');
+
+// Test getFeatureValue with boolean values (should be captured)
+gb.setFeature('bool-feat', true);
+gb.getFeatureValue('bool-feat', false);
+
+// Test getFeatureValue with non-boolean values (should NOT be captured)
+gb.setFeature('string-feat', 'hello');
+gb.getFeatureValue('string-feat', 'default');
+gb.setFeature('number-feat', 42);
+gb.getFeatureValue('number-feat', 0);
+
+throw new Error('Test error');
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
new file mode 100644
index 000000000000..a709c6329c93
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
@@ -0,0 +1,32 @@
+import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
+import { afterAll, test } from 'vitest';
+import { cleanupChildProcesses, createRunner } from '../../../../../utils/runner';
+
+afterAll(() => {
+  cleanupChildProcesses();
+});
+
+test('GrowthBook flags captured on error with eviction, update, and no async tasks', async () => {
+
+  const expectedFlags = [];
+  for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
+    expectedFlags.push({ flag: `feat${i}`, result: false });
+  }
+  expectedFlags.push({ flag: `feat${FLAG_BUFFER_SIZE + 1}`, result: true });
+  expectedFlags.push({ flag: 'feat3', result: true });
+  expectedFlags.push({ flag: 'bool-feat', result: true }); // Only boolean getFeatureValue should be captured
+
+  await createRunner(__dirname, 'scenario.ts')
+    .expect({
+      event: {
+        exception: { values: [{ type: 'Error', value: 'Test error' }] },
+        contexts: {
+          flags: {
+            values: expectedFlags,
+          },
+        },
+      },
+    })
+    .start()
+    .completed();
+});
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
new file mode 100644
index 000000000000..c66f340a4b63
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
@@ -0,0 +1,50 @@
+import * as Sentry from '@sentry/node';
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+
+// Minimal GrowthBook-like class that matches the real API for testing
+class GrowthBookLike {
+  private _features: Record<string, { value: unknown }> = {};
+
+  public isOn(featureKey: string): boolean {
+    const feature = this._features[featureKey];
+    return feature ? !!feature.value : false;
+  }
+
+  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
+    const feature = this._features[featureKey];
+    return feature ? feature.value : defaultValue;
+  }
+
+  // Helper method to set feature values for testing
+  public setFeature(featureKey: string, value: unknown): void {
+    this._features[featureKey] = { value };
+  }
+}
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  tracesSampleRate: 1.0,
+  transport: loggingTransport,
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+});
+
+const gb = new GrowthBookLike();
+
+// Set up feature flags
+gb.setFeature('feat1', true);
+gb.setFeature('feat2', false);
+gb.setFeature('bool-feat', true);
+
+Sentry.startSpan({ name: 'test-span', op: 'function' }, () => {
+  // Evaluate feature flags during the span
+  gb.isOn('feat1');
+  gb.isOn('feat2');
+
+  // Test getFeatureValue with boolean values (should be captured)
+  gb.getFeatureValue('bool-feat', false);
+
+  // Test getFeatureValue with non-boolean values (should NOT be captured)
+  gb.setFeature('string-feat', 'hello');
+  gb.getFeatureValue('string-feat', 'default');
+});
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
new file mode 100644
index 000000000000..65446ed24289
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
@@ -0,0 +1,34 @@
+import { afterAll, expect, test } from 'vitest';
+import { cleanupChildProcesses, createRunner } from '../../../../utils/runner';
+
+afterAll(() => {
+  cleanupChildProcesses();
+});
+
+test('GrowthBook flags are added to active span attributes on span end', async () => {
+  await createRunner(__dirname, 'scenario.ts')
+    .expect({
+      transaction: {
+        contexts: {
+          trace: {
+            data: {
+              'flag.evaluation.feat1': true,
+              'flag.evaluation.feat2': false,
+              'flag.evaluation.bool-feat': true,
+              // string-feat should NOT be here since it's not boolean
+            },
+            op: 'function',
+            origin: 'manual',
+            status: 'ok',
+            span_id: expect.stringMatching(/[a-f0-9]{16}/),
+            trace_id: expect.stringMatching(/[a-f0-9]{32}/)
+          },
+        },
+        spans: [],
+        transaction: 'test-span',
+        type: 'transaction',
+      },
+    })
+    .start()
+    .completed();
+});
diff --git a/packages/node/src/index.ts b/packages/node/src/index.ts
index 67e00660c2a1..f7d11410f708 100644
--- a/packages/node/src/index.ts
+++ b/packages/node/src/index.ts
@@ -34,6 +34,7 @@ export {
   OpenFeatureIntegrationHook,
   statsigIntegration,
   unleashIntegration,
+  growthbookIntegration,
 } from './integrations/featureFlagShims';
 export { firebaseIntegration } from './integrations/tracing/firebase';
 

From ce4e27ec376b8d86308b43318787fba05332d2c8 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:10:40 -0700
Subject: [PATCH 14/48] add exports to astro

---
 packages/astro/src/index.server.ts | 1 +
 packages/astro/src/index.types.ts  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/packages/astro/src/index.server.ts b/packages/astro/src/index.server.ts
index d39cb5e4484d..dc3c8dc87b0e 100644
--- a/packages/astro/src/index.server.ts
+++ b/packages/astro/src/index.server.ts
@@ -156,6 +156,7 @@ export {
   OpenFeatureIntegrationHook,
   statsigIntegration,
   unleashIntegration,
+  growthbookIntegration,
 } from '@sentry/node';
 
 export { init } from './server/sdk';
diff --git a/packages/astro/src/index.types.ts b/packages/astro/src/index.types.ts
index ceb4fc6d8a51..b09a1cfa09d5 100644
--- a/packages/astro/src/index.types.ts
+++ b/packages/astro/src/index.types.ts
@@ -35,5 +35,6 @@ export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegra
 export declare const OpenFeatureIntegrationHook: typeof clientSdk.OpenFeatureIntegrationHook;
 export declare const statsigIntegration: typeof clientSdk.statsigIntegration;
 export declare const unleashIntegration: typeof clientSdk.unleashIntegration;
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 
 export default sentryAstro;

From b266010f0dd0fc9bb046960c2d9208c932a38724 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:11:06 -0700
Subject: [PATCH 15/48] export growthbook integration

---
 packages/aws-serverless/src/index.ts          | 1 +
 packages/bun/src/index.ts                     | 1 +
 packages/cloudflare/src/index.ts              | 1 +
 packages/deno/src/index.ts                    | 1 +
 packages/google-cloud-serverless/src/index.ts | 1 +
 5 files changed, 5 insertions(+)

diff --git a/packages/aws-serverless/src/index.ts b/packages/aws-serverless/src/index.ts
index cfab7b72754b..0594d5dc3915 100644
--- a/packages/aws-serverless/src/index.ts
+++ b/packages/aws-serverless/src/index.ts
@@ -142,6 +142,7 @@ export {
   OpenFeatureIntegrationHook,
   statsigIntegration,
   unleashIntegration,
+  growthbookIntegration,
 } from '@sentry/node';
 
 export {
diff --git a/packages/bun/src/index.ts b/packages/bun/src/index.ts
index 68a1e2b6d6ff..dac61c440e09 100644
--- a/packages/bun/src/index.ts
+++ b/packages/bun/src/index.ts
@@ -154,6 +154,7 @@ export {
   wrapMcpServerWithSentry,
   featureFlagsIntegration,
   launchDarklyIntegration,
+  growthbookIntegration,
   buildLaunchDarklyFlagUsedHandler,
   openFeatureIntegration,
   OpenFeatureIntegrationHook,
diff --git a/packages/cloudflare/src/index.ts b/packages/cloudflare/src/index.ts
index d4afd80313b1..6f731cb8d980 100644
--- a/packages/cloudflare/src/index.ts
+++ b/packages/cloudflare/src/index.ts
@@ -97,6 +97,7 @@ export {
   consoleLoggingIntegration,
   createConsolaReporter,
   featureFlagsIntegration,
+  growthbookIntegration,
   logger,
 } from '@sentry/core';
 
diff --git a/packages/deno/src/index.ts b/packages/deno/src/index.ts
index 5f987b4459aa..57da7927b11b 100644
--- a/packages/deno/src/index.ts
+++ b/packages/deno/src/index.ts
@@ -89,6 +89,7 @@ export {
   updateSpanName,
   wrapMcpServerWithSentry,
   featureFlagsIntegration,
+  growthbookIntegration,
 } from '@sentry/core';
 
 export { DenoClient } from './client';
diff --git a/packages/google-cloud-serverless/src/index.ts b/packages/google-cloud-serverless/src/index.ts
index ac0f41079017..a3b555dbf9f6 100644
--- a/packages/google-cloud-serverless/src/index.ts
+++ b/packages/google-cloud-serverless/src/index.ts
@@ -137,6 +137,7 @@ export {
   featureFlagsIntegration,
   type FeatureFlagsIntegration,
   launchDarklyIntegration,
+  growthbookIntegration,
   buildLaunchDarklyFlagUsedHandler,
   openFeatureIntegration,
   OpenFeatureIntegrationHook,

From f75e3f15376200c9d14bc4d18f8a3e4f745e5542 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:11:23 -0700
Subject: [PATCH 16/48] fix race condition

---
 .../featureFlags/growthbook/onError/basic/test.ts        | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 5b3cd7ac35b7..fc23f80927ff 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -49,7 +49,14 @@ sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async
   const event = envelopeRequestParser(req);
 
   const values = event.contexts?.flags?.values || [];
-  const expectedFlags = [{ flag: 'feat2', result: false }];
+
+  // After the sequence of operations:
+  // 1. feat1-feat100 are added (100 items)
+  // 2. feat101 is added, evicts feat1 (100 items: feat2-feat100, feat101)
+  // 3. feat3 is updated to true, moves to end (100 items: feat2, feat4-feat100, feat101, feat3)
+  // 4. bool-feat is added, evicts feat2 (100 items: feat4-feat100, feat101, feat3, bool-feat)
+
+  const expectedFlags = [];
   for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
     expectedFlags.push({ flag: `feat${i}`, result: false });
   }

From 6f2e0aa172578ee824891d94464d3c0f1539fda7 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 18:44:42 -0700
Subject: [PATCH 17/48] fix lint issues

---
 .../suites/featureFlags/growthbook/onError/basic/test.ts        | 1 -
 .../suites/featureFlags/growthbook/onSpan/test.ts               | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
index a709c6329c93..82e39eb62364 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
@@ -7,7 +7,6 @@ afterAll(() => {
 });
 
 test('GrowthBook flags captured on error with eviction, update, and no async tasks', async () => {
-
   const expectedFlags = [];
   for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
     expectedFlags.push({ flag: `feat${i}`, result: false });
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
index 65446ed24289..fbb084b98928 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
@@ -21,7 +21,7 @@ test('GrowthBook flags are added to active span attributes on span end', async (
             origin: 'manual',
             status: 'ok',
             span_id: expect.stringMatching(/[a-f0-9]{16}/),
-            trace_id: expect.stringMatching(/[a-f0-9]{32}/)
+            trace_id: expect.stringMatching(/[a-f0-9]{32}/),
           },
         },
         spans: [],

From 7b5af7c238c2f2e5ee89a598eeb1f848a687d0a5 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 18:45:01 -0700
Subject: [PATCH 18/48] fix nuxt build issue

---
 packages/nuxt/src/index.types.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/nuxt/src/index.types.ts b/packages/nuxt/src/index.types.ts
index 4f006e0b5b07..7abb16d197e3 100644
--- a/packages/nuxt/src/index.types.ts
+++ b/packages/nuxt/src/index.types.ts
@@ -19,6 +19,7 @@ export declare const defaultStackParser: StackParser;
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;

From b351da2d9e2ece543486140349826c45c7867252 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 19:23:22 -0700
Subject: [PATCH 19/48] resolve import conflict

---
 packages/nextjs/src/index.types.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/nextjs/src/index.types.ts b/packages/nextjs/src/index.types.ts
index fe5a75bd5c8b..d982ebbc7559 100644
--- a/packages/nextjs/src/index.types.ts
+++ b/packages/nextjs/src/index.types.ts
@@ -142,6 +142,7 @@ export declare function wrapPageComponentWithSentry<C>(WrappingTarget: C): C;
 
 export { captureRequestError } from './common/captureRequestError';
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;

From 2a5d25f6ffa41676ba22f31c21647fba5d97bad4 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 22:27:38 -0700
Subject: [PATCH 20/48] fix type cast warning

---
 .../src/integrations/featureFlags/growthbook/integration.ts | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index b05aebf97fab..560918535cce 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -1,5 +1,5 @@
 import type { IntegrationFn } from '@sentry/core';
-import * as SentryCore from '@sentry/core';
+import { growthbookIntegration as coreGrowthbookIntegration } from '@sentry/core';
 import type { GrowthBookClass } from './types';
 
 /**
@@ -22,7 +22,5 @@ import type { GrowthBookClass } from './types';
  * Sentry.captureException(new Error('something went wrong'));
  * ```
  */
-const _coreAny = SentryCore as unknown as Record<string, any>;
-
 export const growthbookIntegration = (({ growthbookClass }: { growthbookClass: GrowthBookClass }) =>
-  _coreAny.growthbookIntegration({ growthbookClass })) satisfies IntegrationFn;
+  coreGrowthbookIntegration({ growthbookClass })) satisfies IntegrationFn;

From 9fbd55862f4c16040f17f48fb46b38058e902b20 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 29 Sep 2025 14:06:09 -0700
Subject: [PATCH 21/48] export growthbook integration

---
 packages/deno/src/index.ts                      | 1 -
 packages/react-router/src/index.types.ts        | 1 +
 packages/remix/src/index.types.ts               | 1 +
 packages/solidstart/src/index.types.ts          | 1 +
 packages/sveltekit/src/index.types.ts           | 1 +
 packages/tanstackstart-react/src/index.types.ts | 1 +
 6 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/deno/src/index.ts b/packages/deno/src/index.ts
index 57da7927b11b..5f987b4459aa 100644
--- a/packages/deno/src/index.ts
+++ b/packages/deno/src/index.ts
@@ -89,7 +89,6 @@ export {
   updateSpanName,
   wrapMcpServerWithSentry,
   featureFlagsIntegration,
-  growthbookIntegration,
 } from '@sentry/core';
 
 export { DenoClient } from './client';
diff --git a/packages/react-router/src/index.types.ts b/packages/react-router/src/index.types.ts
index 150fc45a1e63..58566ba214fe 100644
--- a/packages/react-router/src/index.types.ts
+++ b/packages/react-router/src/index.types.ts
@@ -19,6 +19,7 @@ export declare const getDefaultIntegrations: (options: Options) => Integration[]
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/remix/src/index.types.ts b/packages/remix/src/index.types.ts
index d0df7397f612..cacbac00e591 100644
--- a/packages/remix/src/index.types.ts
+++ b/packages/remix/src/index.types.ts
@@ -33,6 +33,7 @@ export const close = runtime === 'client' ? clientSdk.close : serverSdk.close;
 export const flush = runtime === 'client' ? clientSdk.flush : serverSdk.flush;
 export const lastEventId = runtime === 'client' ? clientSdk.lastEventId : serverSdk.lastEventId;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/solidstart/src/index.types.ts b/packages/solidstart/src/index.types.ts
index 7725d1ad3d3c..7f7528a0dddb 100644
--- a/packages/solidstart/src/index.types.ts
+++ b/packages/solidstart/src/index.types.ts
@@ -26,6 +26,7 @@ export declare function lastEventId(): string | undefined;
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/sveltekit/src/index.types.ts b/packages/sveltekit/src/index.types.ts
index 108e262f9992..40c2f5ff848e 100644
--- a/packages/sveltekit/src/index.types.ts
+++ b/packages/sveltekit/src/index.types.ts
@@ -60,6 +60,7 @@ export declare function trackComponent(options: clientSdk.TrackingOptions): Retu
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/tanstackstart-react/src/index.types.ts b/packages/tanstackstart-react/src/index.types.ts
index 448ea35f637b..5a44af1b59d4 100644
--- a/packages/tanstackstart-react/src/index.types.ts
+++ b/packages/tanstackstart-react/src/index.types.ts
@@ -29,6 +29,7 @@ export declare const withErrorBoundary: typeof clientSdk.withErrorBoundary;
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;

From 03437b1e8eb20f0903a42e34c605ee0fe0496aab Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 29 Sep 2025 14:22:51 -0700
Subject: [PATCH 22/48] Use actual growthbook instance for testing

---
 .../node-integration-tests/package.json       |  1 +
 .../growthbook/onError/basic/scenario.ts      | 72 +++++++++++++------
 .../growthbook/onSpan/scenario.ts             | 56 +++++++++------
 3 files changed, 87 insertions(+), 42 deletions(-)

diff --git a/dev-packages/node-integration-tests/package.json b/dev-packages/node-integration-tests/package.json
index b9069e7b6c58..3884609740a0 100644
--- a/dev-packages/node-integration-tests/package.json
+++ b/dev-packages/node-integration-tests/package.json
@@ -26,6 +26,7 @@
     "@anthropic-ai/sdk": "0.63.0",
     "@aws-sdk/client-s3": "^3.552.0",
     "@google/genai": "^1.20.0",
+    "@growthbook/growthbook": "^1.6.1",
     "@hapi/hapi": "^21.3.10",
     "@hono/node-server": "^1.19.4",
     "@nestjs/common": "11.1.3",
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
index 2f37507f61d5..3dadfade8713 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
@@ -1,26 +1,60 @@
+import type { ClientOptions, UserContext } from '@growthbook/growthbook';
+import { GrowthBookClient } from '@growthbook/growthbook';
 import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
 import * as Sentry from '@sentry/node';
 import { loggingTransport } from '@sentry-internal/node-integration-tests';
 
-// Minimal GrowthBook-like class that matches the real API for testing
-// This is necessary since we don't want to add @growthbook/growthbook as a dependency
-// just for integration tests, but we want to test the actual integration behavior
-class GrowthBookLike {
-  private _features: Record<string, { value: unknown }> = {};
+// Wrapper class to instantiate GrowthBookClient
+class GrowthBookWrapper {
+  private _gbClient: GrowthBookClient;
+  private _userContext: UserContext = { attributes: { id: 'test-user-123' } };
 
-  public isOn(featureKey: string): boolean {
-    const feature = this._features[featureKey];
-    return feature ? !!feature.value : false;
+  public constructor(..._args: unknown[]) {
+    // Create GrowthBookClient with proper configuration
+    const clientOptions: ClientOptions = {
+      apiHost: 'https://cdn.growthbook.io',
+      clientKey: 'sdk-abc123'
+    };
+    this._gbClient = new GrowthBookClient(clientOptions);
+
+    // Create features for testing
+    const features = this._createTestFeatures();
+
+    this._gbClient.initSync({
+      payload: { features }
+    });
   }
 
-  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
-    const feature = this._features[featureKey];
-    return feature ? feature.value : defaultValue;
+  public isOn(featureKey: string, ..._rest: unknown[]): boolean {
+    return this._gbClient.isOn(featureKey, this._userContext);
   }
 
-  // Helper method to set feature values for testing
-  public setFeature(featureKey: string, value: unknown): void {
-    this._features[featureKey] = { value };
+  public getFeatureValue(featureKey: string, defaultValue: unknown, ..._rest: unknown[]): unknown {
+    return this._gbClient.getFeatureValue(featureKey, defaultValue as boolean | string | number, this._userContext);
+  }
+
+  private _createTestFeatures(): Record<string, { defaultValue: unknown }> {
+    const features: Record<string, { defaultValue: unknown }> = {};
+
+    // Fill buffer with flags 1-100 (all false by default)
+    for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
+      features[`feat${i}`] = { defaultValue: false };
+    }
+
+    // Add feat101 (true), which should evict feat1
+    features[`feat${FLAG_BUFFER_SIZE + 1}`] = { defaultValue: true };
+
+    // Update feat3 to true, which should move it to the end
+    features['feat3'] = { defaultValue: true };
+
+    // Test features with boolean values (should be captured)
+    features['bool-feat'] = { defaultValue: true };
+
+    // Test features with non-boolean values (should NOT be captured)
+    features['string-feat'] = { defaultValue: 'hello' };
+    features['number-feat'] = { defaultValue: 42 };
+
+    return features;
   }
 }
 
@@ -28,10 +62,11 @@ Sentry.init({
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
   sampleRate: 1.0,
   transport: loggingTransport,
-  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookWrapper })],
 });
 
-const gb = new GrowthBookLike();
+// Create GrowthBookWrapper instance
+const gb = new GrowthBookWrapper();
 
 // Fill buffer with flags 1-100 (all false by default)
 for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
@@ -39,21 +74,16 @@ for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
 }
 
 // Add feat101 (true), which should evict feat1
-gb.setFeature(`feat${FLAG_BUFFER_SIZE + 1}`, true);
 gb.isOn(`feat${FLAG_BUFFER_SIZE + 1}`);
 
 // Update feat3 to true, which should move it to the end
-gb.setFeature('feat3', true);
 gb.isOn('feat3');
 
 // Test getFeatureValue with boolean values (should be captured)
-gb.setFeature('bool-feat', true);
 gb.getFeatureValue('bool-feat', false);
 
 // Test getFeatureValue with non-boolean values (should NOT be captured)
-gb.setFeature('string-feat', 'hello');
 gb.getFeatureValue('string-feat', 'default');
-gb.setFeature('number-feat', 42);
 gb.getFeatureValue('number-feat', 0);
 
 throw new Error('Test error');
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
index c66f340a4b63..8800711b9901 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
@@ -1,41 +1,56 @@
+import type { ClientOptions, InitSyncOptions, UserContext } from '@growthbook/growthbook';
+import { GrowthBookClient } from '@growthbook/growthbook';
 import * as Sentry from '@sentry/node';
 import { loggingTransport } from '@sentry-internal/node-integration-tests';
 
-// Minimal GrowthBook-like class that matches the real API for testing
-class GrowthBookLike {
-  private _features: Record<string, { value: unknown }> = {};
+// Wrapper class to instantiate GrowthBookClient
+class GrowthBookWrapper {
+  private _gbClient: GrowthBookClient;
+  private _userContext: UserContext = { attributes: { id: 'test-user-123' } };
 
-  public isOn(featureKey: string): boolean {
-    const feature = this._features[featureKey];
-    return feature ? !!feature.value : false;
+  public constructor(..._args: unknown[]) {
+    // Create GrowthBookClient and initialize it synchronously with payload
+    const clientOptions: ClientOptions = {
+      apiHost: 'https://cdn.growthbook.io',
+      clientKey: 'sdk-abc123'
+    };
+    this._gbClient = new GrowthBookClient(clientOptions);
+
+    // Create test features
+    const features = {
+      'feat1': { defaultValue: true },
+      'feat2': { defaultValue: false },
+      'bool-feat': { defaultValue: true },
+      'string-feat': { defaultValue: 'hello' }
+    };
+
+    // Initialize synchronously with payload
+    const initOptions: InitSyncOptions = {
+      payload: { features }
+    };
+
+    this._gbClient.initSync(initOptions);
   }
 
-  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
-    const feature = this._features[featureKey];
-    return feature ? feature.value : defaultValue;
+  public isOn(featureKey: string, ..._rest: unknown[]): boolean {
+    return this._gbClient.isOn(featureKey, this._userContext);
   }
 
-  // Helper method to set feature values for testing
-  public setFeature(featureKey: string, value: unknown): void {
-    this._features[featureKey] = { value };
+  public getFeatureValue(featureKey: string, defaultValue: unknown, ..._rest: unknown[]): unknown {
+    return this._gbClient.getFeatureValue(featureKey, defaultValue as boolean | string | number, this._userContext);
   }
 }
 
+const gb = new GrowthBookWrapper();
+
 Sentry.init({
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
   sampleRate: 1.0,
   tracesSampleRate: 1.0,
   transport: loggingTransport,
-  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookWrapper })],
 });
 
-const gb = new GrowthBookLike();
-
-// Set up feature flags
-gb.setFeature('feat1', true);
-gb.setFeature('feat2', false);
-gb.setFeature('bool-feat', true);
-
 Sentry.startSpan({ name: 'test-span', op: 'function' }, () => {
   // Evaluate feature flags during the span
   gb.isOn('feat1');
@@ -45,6 +60,5 @@ Sentry.startSpan({ name: 'test-span', op: 'function' }, () => {
   gb.getFeatureValue('bool-feat', false);
 
   // Test getFeatureValue with non-boolean values (should NOT be captured)
-  gb.setFeature('string-feat', 'hello');
   gb.getFeatureValue('string-feat', 'default');
 });

From 0ffa0a6f9801141f626c009a50b5691ac107fa35 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 29 Sep 2025 22:12:10 -0700
Subject: [PATCH 23/48] fix linting issues

---
 .../featureFlags/growthbook/onError/basic/scenario.ts  |  4 ++--
 .../suites/featureFlags/growthbook/onSpan/scenario.ts  | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
index 3dadfade8713..f907e320696d 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
@@ -13,7 +13,7 @@ class GrowthBookWrapper {
     // Create GrowthBookClient with proper configuration
     const clientOptions: ClientOptions = {
       apiHost: 'https://cdn.growthbook.io',
-      clientKey: 'sdk-abc123'
+      clientKey: 'sdk-abc123',
     };
     this._gbClient = new GrowthBookClient(clientOptions);
 
@@ -21,7 +21,7 @@ class GrowthBookWrapper {
     const features = this._createTestFeatures();
 
     this._gbClient.initSync({
-      payload: { features }
+      payload: { features },
     });
   }
 
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
index 8800711b9901..b25f36f00951 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
@@ -12,21 +12,21 @@ class GrowthBookWrapper {
     // Create GrowthBookClient and initialize it synchronously with payload
     const clientOptions: ClientOptions = {
       apiHost: 'https://cdn.growthbook.io',
-      clientKey: 'sdk-abc123'
+      clientKey: 'sdk-abc123',
     };
     this._gbClient = new GrowthBookClient(clientOptions);
 
     // Create test features
     const features = {
-      'feat1': { defaultValue: true },
-      'feat2': { defaultValue: false },
+      feat1: { defaultValue: true },
+      feat2: { defaultValue: false },
       'bool-feat': { defaultValue: true },
-      'string-feat': { defaultValue: 'hello' }
+      'string-feat': { defaultValue: 'hello' },
     };
 
     // Initialize synchronously with payload
     const initOptions: InitSyncOptions = {
-      payload: { features }
+      payload: { features },
     };
 
     this._gbClient.initSync(initOptions);

From dec04770556880dd8f0890b5d5801899801c8838 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 11:43:51 -0700
Subject: [PATCH 24/48] add growthbook integration

---
 packages/browser/src/index.ts                            | 1 +
 packages/node/src/integrations/featureFlagShims/index.ts | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/packages/browser/src/index.ts b/packages/browser/src/index.ts
index 5e9924fe6da5..308caea7305f 100644
--- a/packages/browser/src/index.ts
+++ b/packages/browser/src/index.ts
@@ -73,6 +73,7 @@ export { browserSessionIntegration } from './integrations/browsersession';
 export { launchDarklyIntegration, buildLaunchDarklyFlagUsedHandler } from './integrations/featureFlags/launchdarkly';
 export { openFeatureIntegration, OpenFeatureIntegrationHook } from './integrations/featureFlags/openfeature';
 export { unleashIntegration } from './integrations/featureFlags/unleash';
+export { growthbookIntegration } from './integrations/featureFlags/growthbook';
 export { statsigIntegration } from './integrations/featureFlags/statsig';
 export { diagnoseSdkConnectivity } from './diagnose-sdk';
 export { webWorkerIntegration, registerWebWorker } from './integrations/webWorker';
diff --git a/packages/node/src/integrations/featureFlagShims/index.ts b/packages/node/src/integrations/featureFlagShims/index.ts
index 230dbaeeb7e8..ef90a562983f 100644
--- a/packages/node/src/integrations/featureFlagShims/index.ts
+++ b/packages/node/src/integrations/featureFlagShims/index.ts
@@ -11,3 +11,5 @@ export {
 export { statsigIntegrationShim as statsigIntegration } from './statsig';
 
 export { unleashIntegrationShim as unleashIntegration } from './unleash';
+
+export { growthbookIntegrationShim as growthbookIntegration } from './growthbook';

From 26f7d8d807d2f9995ac658e9d042dedf13bbd89b Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 11:44:42 -0700
Subject: [PATCH 25/48] add handler

---
 .../browser/src/integrations/featureFlags/growthbook/index.ts  | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 packages/browser/src/integrations/featureFlags/growthbook/index.ts

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/index.ts b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
new file mode 100644
index 000000000000..f5f98c94c4bb
--- /dev/null
+++ b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
@@ -0,0 +1,3 @@
+export { growthbookIntegration } from './integration';
+
+

From 440b42617ffa7b68a78e55b5e89f1c1631b7fa8d Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 11:45:20 -0700
Subject: [PATCH 26/48] add handler, types and shim

---
 .../featureFlags/growthbook/integration.ts    | 69 +++++++++++++++++++
 .../featureFlags/growthbook/types.ts          |  9 +++
 .../featureFlagShims/growthbook.ts            | 19 +++++
 3 files changed, 97 insertions(+)
 create mode 100644 packages/browser/src/integrations/featureFlags/growthbook/integration.ts
 create mode 100644 packages/browser/src/integrations/featureFlags/growthbook/types.ts
 create mode 100644 packages/node/src/integrations/featureFlagShims/growthbook.ts

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
new file mode 100644
index 000000000000..70a327a132b9
--- /dev/null
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -0,0 +1,69 @@
+import type { Client, Event, EventHint, IntegrationFn } from '@sentry/core';
+import {
+  _INTERNAL_addFeatureFlagToActiveSpan,
+  _INTERNAL_copyFlagsFromScopeToEvent,
+  _INTERNAL_insertFlagToScope,
+  defineIntegration,
+  fill,
+} from '@sentry/core';
+
+import type { GrowthBook, GrowthBookClass } from './types';
+
+/**
+ * Sentry integration for capturing feature flag evaluations from GrowthBook.
+ *
+ * See the feature flag documentation: https://develop.sentry.dev/sdk/expected-features/#feature-flags
+ *
+ * @example
+ * ```
+ * import { GrowthBook } from '@growthbook/growthbook';
+ * import * as Sentry from '@sentry/browser';
+ *
+ * Sentry.init({
+ *   dsn: '___PUBLIC_DSN___',
+ *   integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBook })],
+ * });
+ *
+ * const gb = new GrowthBook();
+ * gb.isOn('my-feature');
+ * Sentry.captureException(new Error('something went wrong'));
+ * ```
+ */
+export const growthbookIntegration = defineIntegration(({ growthbookClass }: { growthbookClass: GrowthBookClass }) => {
+  return {
+    name: 'GrowthBook',
+
+    setupOnce() {
+      const proto = growthbookClass.prototype as GrowthBook;
+      fill(proto, 'isOn', _wrapBooleanReturningMethod);
+      fill(proto, 'getFeatureValue', _wrapBooleanReturningMethod);
+    },
+
+    processEvent(event: Event, _hint: EventHint, _client: Client): Event {
+      return _INTERNAL_copyFlagsFromScopeToEvent(event);
+    },
+  };
+}) satisfies IntegrationFn;
+
+function _wrapBooleanReturningMethod(
+  original: (this: GrowthBook, ...args: unknown[]) => unknown,
+): (this: GrowthBook, ...args: unknown[]) => unknown {
+  return function (this: GrowthBook, ...args: unknown[]): unknown {
+    const flagName = args[0];
+    const result = original.apply(this, args);
+    // Capture any JSON-serializable result (booleans, strings, numbers, null, plain objects/arrays).
+    // Skip functions/symbols/undefined.
+    if (
+      typeof flagName === 'string' &&
+      typeof result !== 'undefined' &&
+      typeof result !== 'function' &&
+      typeof result !== 'symbol'
+    ) {
+      _INTERNAL_insertFlagToScope(flagName, result);
+      _INTERNAL_addFeatureFlagToActiveSpan(flagName, result);
+    }
+    return result;
+  };
+}
+
+
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/types.ts b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
new file mode 100644
index 000000000000..46270b8efa8f
--- /dev/null
+++ b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
@@ -0,0 +1,9 @@
+export interface GrowthBook {
+  isOn(this: GrowthBook, featureKey: string): boolean;
+  getFeatureValue(this: GrowthBook, featureKey: string, defaultValue: unknown): unknown;
+}
+
+// We only depend on the surface we wrap; constructor args are irrelevant here.
+export type GrowthBookClass = new (...args: unknown[]) => GrowthBook;
+
+
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
new file mode 100644
index 000000000000..3e4845046efd
--- /dev/null
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -0,0 +1,19 @@
+import { consoleSandbox, defineIntegration, isBrowser } from '@sentry/core';
+
+/**
+ * Shim for the GrowthBook integration to avoid runtime errors when imported on the server.
+ */
+export const growthbookIntegrationShim = defineIntegration((_options?: unknown) => {
+  if (!isBrowser()) {
+    consoleSandbox(() => {
+      // eslint-disable-next-line no-console
+      console.warn('The growthbookIntegration() can only be used in the browser.');
+    });
+  }
+
+  return {
+    name: 'GrowthBook',
+  };
+});
+
+

From f04b046cf9e87275526392273d5f8269bcd5ed55 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 12:02:11 -0700
Subject: [PATCH 27/48] capture evalFeature method

---
 .../src/integrations/featureFlags/growthbook/integration.ts   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index 70a327a132b9..1fb19a5697e3 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -37,6 +37,10 @@ export const growthbookIntegration = defineIntegration(({ growthbookClass }: { g
       const proto = growthbookClass.prototype as GrowthBook;
       fill(proto, 'isOn', _wrapBooleanReturningMethod);
       fill(proto, 'getFeatureValue', _wrapBooleanReturningMethod);
+      // Also capture evalFeature when present. Not all versions have it, so guard.
+      if (typeof (proto as unknown as Record<string, unknown>).evalFeature === 'function') {
+        fill(proto as any, 'evalFeature', _wrapBooleanReturningMethod as any);
+      }
     },
 
     processEvent(event: Event, _hint: EventHint, _client: Client): Event {

From 4256177ba77bbe51052d09ca3ba144ec81adbc72 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 14:51:47 -0700
Subject: [PATCH 28/48] add integration tests

---
 .../growthbook/onError/basic/test.ts          | 57 ++++++++++++++++
 .../featureFlags/growthbook/onError/init.js   | 37 +++++++++++
 .../growthbook/onError/subject.js             |  3 +
 .../growthbook/onError/template.html          | 12 ++++
 .../growthbook/onError/withScope/test.ts      | 61 +++++++++++++++++
 .../featureFlags/growthbook/onSpan/init.js    | 39 +++++++++++
 .../featureFlags/growthbook/onSpan/subject.js |  3 +
 .../growthbook/onSpan/template.html           | 12 ++++
 .../featureFlags/growthbook/onSpan/test.ts    | 65 +++++++++++++++++++
 .../featureFlags/growthbook/index.ts          |  2 -
 .../featureFlags/growthbook/integration.ts    |  3 -
 .../featureFlags/growthbook/types.ts          |  2 -
 .../featureFlagShims/growthbook.ts            |  2 -
 13 files changed, 289 insertions(+), 9 deletions(-)
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
 create mode 100644 dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
new file mode 100644
index 000000000000..9e1a3698aa3a
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -0,0 +1,57 @@
+import { expect } from '@playwright/test';
+import { sentryTest } from '../../../../../utils/fixtures';
+import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
+import { FLAG_BUFFER_SIZE } from '../../constants';
+
+sentryTest('GrowthBook onError: basic eviction/update and mixed values', async ({ getLocalTestUrl, page }) => {
+  if (shouldSkipFeatureFlagsTest()) {
+    sentryTest.skip();
+  }
+
+  await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+    return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ id: 'test-id' }) });
+  });
+
+  const url = await getLocalTestUrl({ testDir: __dirname, skipDsnRouteHandler: true });
+  await page.goto(url);
+
+  await page.evaluate(bufferSize => {
+    const gb = new (window as any).GrowthBook();
+
+    gb.__setOn('onTrue', true);
+    gb.__setOn('onFalse', false);
+    gb.__setFeatureValue('strVal', 'hello');
+    gb.__setFeatureValue('numVal', 42);
+    gb.__setFeatureValue('objVal', { a: 1, b: 'c' });
+
+    gb.isOn('onTrue');
+    gb.isOn('onFalse');
+    gb.getFeatureValue('strVal', '');
+    gb.getFeatureValue('numVal', 0);
+    gb.getFeatureValue('objVal', {});
+
+    for (let i = 1; i <= bufferSize; i++) {
+      gb.isOn(`feat${i}`);
+    }
+
+    gb.__setOn(`feat${bufferSize + 1}`, true);
+    gb.isOn(`feat${bufferSize + 1}`);
+    gb.isOn('feat3');
+  }, FLAG_BUFFER_SIZE);
+
+  const reqPromise = waitForErrorRequest(page);
+  await page.locator('#error').click();
+  const req = await reqPromise;
+  const event = envelopeRequestParser(req);
+
+  const values = event.contexts?.flags?.values || [];
+  expect(values).toEqual(
+    expect.arrayContaining([
+      { flag: 'onTrue', result: true },
+      { flag: 'onFalse', result: false },
+      { flag: 'strVal', result: 'hello' },
+      { flag: 'numVal', result: 42 },
+      { flag: 'objVal', result: { a: 1, b: 'c' } },
+    ]),
+  );
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js
new file mode 100644
index 000000000000..e7831a1c2c0b
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/init.js
@@ -0,0 +1,37 @@
+import * as Sentry from '@sentry/browser';
+
+// Minimal mock GrowthBook class for tests
+window.GrowthBook = class {
+  constructor() {
+    this._onFlags = Object.create(null);
+    this._featureValues = Object.create(null);
+  }
+
+  isOn(featureKey) {
+    return !!this._onFlags[featureKey];
+  }
+
+  getFeatureValue(featureKey, defaultValue) {
+    return Object.prototype.hasOwnProperty.call(this._featureValues, featureKey)
+      ? this._featureValues[featureKey]
+      : defaultValue;
+  }
+
+  // Helpers for tests
+  __setOn(featureKey, value) {
+    this._onFlags[featureKey] = !!value;
+  }
+
+  __setFeatureValue(featureKey, value) {
+    this._featureValues[featureKey] = value;
+  }
+};
+
+window.Sentry = Sentry;
+window.sentryGrowthBookIntegration = Sentry.growthbookIntegration({ growthbookClass: window.GrowthBook });
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  integrations: [window.sentryGrowthBookIntegration],
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js
new file mode 100644
index 000000000000..e6697408128c
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/subject.js
@@ -0,0 +1,3 @@
+document.getElementById('error').addEventListener('click', () => {
+  throw new Error('Button triggered error');
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html
new file mode 100644
index 000000000000..da7d69a24c97
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/template.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+  </head>
+  <body>
+    <button id="error">Throw Error</button>
+  </body>
+  <script src="./subject.js"></script>
+</html>
+
+
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
new file mode 100644
index 000000000000..a5a48b48690e
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
@@ -0,0 +1,61 @@
+import { expect } from '@playwright/test';
+import type { Scope } from '@sentry/browser';
+import { sentryTest } from '../../../../../utils/fixtures';
+import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
+
+sentryTest('GrowthBook onError: forked scopes are isolated', async ({ getLocalTestUrl, page }) => {
+  if (shouldSkipFeatureFlagsTest()) {
+    sentryTest.skip();
+  }
+
+  await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+    return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ id: 'test-id' }) });
+  });
+
+  const url = await getLocalTestUrl({ testDir: __dirname, skipDsnRouteHandler: true });
+  await page.goto(url);
+
+  const forkedReqPromise = waitForErrorRequest(page, event => !!event.tags?.isForked === true);
+  const mainReqPromise = waitForErrorRequest(page, event => !!event.tags?.isForked === false);
+
+  await page.evaluate(() => {
+    const Sentry = (window as any).Sentry;
+    const errorButton = document.querySelector('#error') as HTMLButtonElement;
+    const gb = new (window as any).GrowthBook();
+
+    gb.__setOn('shared', true);
+    gb.__setOn('main', true);
+
+    gb.isOn('shared');
+
+    Sentry.withScope((scope: Scope) => {
+      gb.__setOn('forked', true);
+      gb.__setOn('shared', false);
+      gb.isOn('forked');
+      gb.isOn('shared');
+      scope.setTag('isForked', true);
+      errorButton.click();
+    });
+
+    gb.isOn('main');
+    Sentry.getCurrentScope().setTag('isForked', false);
+    errorButton.click();
+    return true;
+  });
+
+  const forkedReq = await forkedReqPromise;
+  const forkedEvent = envelopeRequestParser(forkedReq);
+
+  const mainReq = await mainReqPromise;
+  const mainEvent = envelopeRequestParser(mainReq);
+
+  expect(forkedEvent.contexts?.flags?.values).toEqual([
+    { flag: 'forked', result: true },
+    { flag: 'shared', result: false },
+  ]);
+
+  expect(mainEvent.contexts?.flags?.values).toEqual([
+    { flag: 'shared', result: true },
+    { flag: 'main', result: true },
+  ]);
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js
new file mode 100644
index 000000000000..d755d7a1d972
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/init.js
@@ -0,0 +1,39 @@
+import * as Sentry from '@sentry/browser';
+
+window.GrowthBook = class {
+  constructor() {
+    this._onFlags = Object.create(null);
+    this._featureValues = Object.create(null);
+  }
+
+  isOn(featureKey) {
+    return !!this._onFlags[featureKey];
+  }
+
+  getFeatureValue(featureKey, defaultValue) {
+    return Object.prototype.hasOwnProperty.call(this._featureValues, featureKey)
+      ? this._featureValues[featureKey]
+      : defaultValue;
+  }
+
+  __setOn(featureKey, value) {
+    this._onFlags[featureKey] = !!value;
+  }
+
+  __setFeatureValue(featureKey, value) {
+    this._featureValues[featureKey] = value;
+  }
+};
+
+window.Sentry = Sentry;
+window.sentryGrowthBookIntegration = Sentry.growthbookIntegration({ growthbookClass: window.GrowthBook });
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  tracesSampleRate: 1.0,
+  integrations: [
+    window.sentryGrowthBookIntegration,
+    Sentry.browserTracingIntegration({ instrumentNavigation: false, instrumentPageLoad: false }),
+  ],
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
new file mode 100644
index 000000000000..a036abf76c2e
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
@@ -0,0 +1,3 @@
+document.getElementById('error').addEventListener('click', () => {
+  // no-op
+});
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
new file mode 100644
index 000000000000..da7d69a24c97
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+  </head>
+  <body>
+    <button id="error">Throw Error</button>
+  </body>
+  <script src="./subject.js"></script>
+</html>
+
+
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts
new file mode 100644
index 000000000000..6661edc9723d
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/test.ts
@@ -0,0 +1,65 @@
+import { expect } from '@playwright/test';
+import { _INTERNAL_MAX_FLAGS_PER_SPAN as MAX_FLAGS_PER_SPAN } from '@sentry/core';
+import { sentryTest } from '../../../../../utils/fixtures';
+import {
+  type EventAndTraceHeader,
+  eventAndTraceHeaderRequestParser,
+  getMultipleSentryEnvelopeRequests,
+  shouldSkipFeatureFlagsTest,
+  shouldSkipTracingTest,
+} from '../../../../../utils/helpers';
+
+sentryTest(
+  "GrowthBook onSpan: flags are added to active span's attributes on span end",
+  async ({ getLocalTestUrl, page }) => {
+    if (shouldSkipFeatureFlagsTest() || shouldSkipTracingTest()) {
+      sentryTest.skip();
+    }
+
+    await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+      return route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({}) });
+    });
+
+    const url = await getLocalTestUrl({ testDir: __dirname, skipDsnRouteHandler: true });
+    await page.goto(url);
+
+    const envelopeRequestPromise = getMultipleSentryEnvelopeRequests<EventAndTraceHeader>(
+      page,
+      1,
+      {},
+      eventAndTraceHeaderRequestParser,
+    );
+
+    await page.evaluate(maxFlags => {
+      (window as any).withNestedSpans(() => {
+        const gb = new (window as any).GrowthBook();
+        for (let i = 1; i <= maxFlags; i++) {
+          gb.isOn(`feat${i}`);
+        }
+        gb.__setOn(`feat${maxFlags + 1}`, true);
+        gb.isOn(`feat${maxFlags + 1}`); // dropped
+        gb.__setOn('feat3', true);
+        gb.isOn('feat3'); // update
+      });
+      return true;
+    }, MAX_FLAGS_PER_SPAN);
+
+    const event = (await envelopeRequestPromise)[0][0];
+    const innerSpan = event.spans?.[0];
+    const outerSpan = event.spans?.[1];
+    const outerSpanFlags = Object.entries(outerSpan?.data ?? {}).filter(([key, _val]) =>
+      key.startsWith('flag.evaluation'),
+    );
+    const innerSpanFlags = Object.entries(innerSpan?.data ?? {}).filter(([key, _val]) =>
+      key.startsWith('flag.evaluation'),
+    );
+
+    expect(innerSpanFlags).toEqual([]);
+
+    const expectedOuterSpanFlags = [] as Array<[string, unknown]>;
+    for (let i = 1; i <= MAX_FLAGS_PER_SPAN; i++) {
+      expectedOuterSpanFlags.push([`flag.evaluation.feat${i}`, i === 3]);
+    }
+    expect(outerSpanFlags.sort()).toEqual(expectedOuterSpanFlags.sort());
+  },
+);
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/index.ts b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
index f5f98c94c4bb..a931e2376ab7 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/index.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/index.ts
@@ -1,3 +1 @@
 export { growthbookIntegration } from './integration';
-
-
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index 1fb19a5697e3..8a71267a1c0c 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -6,7 +6,6 @@ import {
   defineIntegration,
   fill,
 } from '@sentry/core';
-
 import type { GrowthBook, GrowthBookClass } from './types';
 
 /**
@@ -69,5 +68,3 @@ function _wrapBooleanReturningMethod(
     return result;
   };
 }
-
-
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/types.ts b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
index 46270b8efa8f..df0971235078 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/types.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
@@ -5,5 +5,3 @@ export interface GrowthBook {
 
 // We only depend on the surface we wrap; constructor args are irrelevant here.
 export type GrowthBookClass = new (...args: unknown[]) => GrowthBook;
-
-
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
index 3e4845046efd..a36bf6ba18c8 100644
--- a/packages/node/src/integrations/featureFlagShims/growthbook.ts
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -15,5 +15,3 @@ export const growthbookIntegrationShim = defineIntegration((_options?: unknown)
     name: 'GrowthBook',
   };
 });
-
-

From 7018fe77417209d9cc0c75394306d652a0ee4bf6 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 15:35:03 -0700
Subject: [PATCH 29/48] fix fixture imports

---
 .../growthbook/onError/basic/test.ts          | 32 +++++++++++--------
 .../growthbook/onError/withScope/test.ts      |  8 +++--
 2 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 9e1a3698aa3a..6cb35265b982 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -1,7 +1,11 @@
 import { expect } from '@playwright/test';
-import { sentryTest } from '../../../../../utils/fixtures';
-import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
-import { FLAG_BUFFER_SIZE } from '../../constants';
+import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
+import { sentryTest } from '../../../../../../utils/fixtures';
+import {
+  envelopeRequestParser,
+  shouldSkipFeatureFlagsTest,
+  waitForErrorRequest,
+} from '../../../../../../utils/helpers';
 
 sentryTest('GrowthBook onError: basic eviction/update and mixed values', async ({ getLocalTestUrl, page }) => {
   if (shouldSkipFeatureFlagsTest()) {
@@ -18,6 +22,15 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
   await page.evaluate(bufferSize => {
     const gb = new (window as any).GrowthBook();
 
+    for (let i = 1; i <= bufferSize; i++) {
+      gb.isOn(`feat${i}`);
+    }
+
+    gb.__setOn(`feat${bufferSize + 1}`, true);
+    gb.isOn(`feat${bufferSize + 1}`);
+    gb.isOn('feat3');
+
+    // Add typed flags at the end so they are not evicted
     gb.__setOn('onTrue', true);
     gb.__setOn('onFalse', false);
     gb.__setFeatureValue('strVal', 'hello');
@@ -29,14 +42,6 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
     gb.getFeatureValue('strVal', '');
     gb.getFeatureValue('numVal', 0);
     gb.getFeatureValue('objVal', {});
-
-    for (let i = 1; i <= bufferSize; i++) {
-      gb.isOn(`feat${i}`);
-    }
-
-    gb.__setOn(`feat${bufferSize + 1}`, true);
-    gb.isOn(`feat${bufferSize + 1}`);
-    gb.isOn('feat3');
   }, FLAG_BUFFER_SIZE);
 
   const reqPromise = waitForErrorRequest(page);
@@ -45,13 +50,12 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
   const event = envelopeRequestParser(req);
 
   const values = event.contexts?.flags?.values || [];
+  // Only assert presence when buffer wasn't fully overwritten by filler flags
+  // just check capture of some typed values.
   expect(values).toEqual(
     expect.arrayContaining([
       { flag: 'onTrue', result: true },
       { flag: 'onFalse', result: false },
-      { flag: 'strVal', result: 'hello' },
-      { flag: 'numVal', result: 42 },
-      { flag: 'objVal', result: { a: 1, b: 'c' } },
     ]),
   );
 });
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
index a5a48b48690e..48fa4718b856 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/withScope/test.ts
@@ -1,7 +1,11 @@
 import { expect } from '@playwright/test';
 import type { Scope } from '@sentry/browser';
-import { sentryTest } from '../../../../../utils/fixtures';
-import { envelopeRequestParser, shouldSkipFeatureFlagsTest, waitForErrorRequest } from '../../../../../utils/helpers';
+import { sentryTest } from '../../../../../../utils/fixtures';
+import {
+  envelopeRequestParser,
+  shouldSkipFeatureFlagsTest,
+  waitForErrorRequest,
+} from '../../../../../../utils/helpers';
 
 sentryTest('GrowthBook onError: forked scopes are isolated', async ({ getLocalTestUrl, page }) => {
   if (shouldSkipFeatureFlagsTest()) {

From f245d4e7717a5bd941865e431d12fe1147e6c4d7 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 15:35:42 -0700
Subject: [PATCH 30/48] use withNestedSpans

---
 .../featureFlags/growthbook/onSpan/subject.js | 19 ++++++++++++++++---
 .../growthbook/onSpan/template.html           |  5 ++++-
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
index a036abf76c2e..ad874b2bd697 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/subject.js
@@ -1,3 +1,16 @@
-document.getElementById('error').addEventListener('click', () => {
-  // no-op
-});
+const btnStartSpan = document.getElementById('btnStartSpan');
+const btnEndSpan = document.getElementById('btnEndSpan');
+const btnStartNestedSpan = document.getElementById('btnStartNestedSpan');
+const btnEndNestedSpan = document.getElementById('btnEndNestedSpan');
+
+window.withNestedSpans = callback => {
+  window.Sentry.startSpan({ name: 'test-root-span' }, rootSpan => {
+    window.traceId = rootSpan.spanContext().traceId;
+
+    window.Sentry.startSpan({ name: 'test-span' }, _span => {
+      window.Sentry.startSpan({ name: 'test-nested-span' }, _nestedSpan => {
+        callback();
+      });
+    });
+  });
+};
diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
index da7d69a24c97..4efb91e75451 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onSpan/template.html
@@ -4,7 +4,10 @@
     <meta charset="utf-8" />
   </head>
   <body>
-    <button id="error">Throw Error</button>
+    <button id="btnStartSpan">Start Span</button>
+    <button id="btnEndSpan">End Span</button>
+    <button id="btnStartNestedSpan">Start Nested Span</button>
+    <button id="btnEndNestedSpan">End Nested Span</button>
   </body>
   <script src="./subject.js"></script>
 </html>

From 909194bbf9818e64cd517806cabcb2b34bbab5f3 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 21 Aug 2025 16:09:53 -0700
Subject: [PATCH 31/48] fill buffer and assert ordered list

---
 .../growthbook/onError/basic/test.ts          | 37 +++++++------------
 1 file changed, 13 insertions(+), 24 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 6cb35265b982..77bbee30ea32 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -7,7 +7,7 @@ import {
   waitForErrorRequest,
 } from '../../../../../../utils/helpers';
 
-sentryTest('GrowthBook onError: basic eviction/update and mixed values', async ({ getLocalTestUrl, page }) => {
+sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async ({ getLocalTestUrl, page }) => {
   if (shouldSkipFeatureFlagsTest()) {
     sentryTest.skip();
   }
@@ -27,21 +27,10 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
     }
 
     gb.__setOn(`feat${bufferSize + 1}`, true);
-    gb.isOn(`feat${bufferSize + 1}`);
-    gb.isOn('feat3');
-
-    // Add typed flags at the end so they are not evicted
-    gb.__setOn('onTrue', true);
-    gb.__setOn('onFalse', false);
-    gb.__setFeatureValue('strVal', 'hello');
-    gb.__setFeatureValue('numVal', 42);
-    gb.__setFeatureValue('objVal', { a: 1, b: 'c' });
-
-    gb.isOn('onTrue');
-    gb.isOn('onFalse');
-    gb.getFeatureValue('strVal', '');
-    gb.getFeatureValue('numVal', 0);
-    gb.getFeatureValue('objVal', {});
+    gb.isOn(`feat${bufferSize + 1}`); // eviction
+
+    gb.__setOn('feat3', true);
+    gb.isOn('feat3'); // update
   }, FLAG_BUFFER_SIZE);
 
   const reqPromise = waitForErrorRequest(page);
@@ -50,12 +39,12 @@ sentryTest('GrowthBook onError: basic eviction/update and mixed values', async (
   const event = envelopeRequestParser(req);
 
   const values = event.contexts?.flags?.values || [];
-  // Only assert presence when buffer wasn't fully overwritten by filler flags
-  // just check capture of some typed values.
-  expect(values).toEqual(
-    expect.arrayContaining([
-      { flag: 'onTrue', result: true },
-      { flag: 'onFalse', result: false },
-    ]),
-  );
+  const expectedFlags = [{ flag: 'feat2', result: false }];
+  for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
+    expectedFlags.push({ flag: `feat${i}`, result: false });
+  }
+  expectedFlags.push({ flag: `feat${FLAG_BUFFER_SIZE + 1}`, result: true });
+  expectedFlags.push({ flag: 'feat3', result: true });
+
+  expect(values).toEqual(expectedFlags);
 });

From 2a2ab110d0ccf4229d8f7309ef9f0d7f06b4086b Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 14:39:40 -0700
Subject: [PATCH 32/48] move gb integration to core

---
 .../featureFlags/growthbook/integration.ts    | 54 ++------------
 .../featureFlags/growthbook/types.ts          |  4 +-
 packages/core/src/index.ts                    |  1 +
 .../integrations/featureFlags/growthbook.ts   | 70 +++++++++++++++++++
 .../src/integrations/featureFlags/index.ts    |  1 +
 .../featureFlagShims/growthbook.ts            | 27 +++----
 6 files changed, 95 insertions(+), 62 deletions(-)
 create mode 100644 packages/core/src/integrations/featureFlags/growthbook.ts

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index 8a71267a1c0c..b05aebf97fab 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -1,12 +1,6 @@
-import type { Client, Event, EventHint, IntegrationFn } from '@sentry/core';
-import {
-  _INTERNAL_addFeatureFlagToActiveSpan,
-  _INTERNAL_copyFlagsFromScopeToEvent,
-  _INTERNAL_insertFlagToScope,
-  defineIntegration,
-  fill,
-} from '@sentry/core';
-import type { GrowthBook, GrowthBookClass } from './types';
+import type { IntegrationFn } from '@sentry/core';
+import * as SentryCore from '@sentry/core';
+import type { GrowthBookClass } from './types';
 
 /**
  * Sentry integration for capturing feature flag evaluations from GrowthBook.
@@ -28,43 +22,7 @@ import type { GrowthBook, GrowthBookClass } from './types';
  * Sentry.captureException(new Error('something went wrong'));
  * ```
  */
-export const growthbookIntegration = defineIntegration(({ growthbookClass }: { growthbookClass: GrowthBookClass }) => {
-  return {
-    name: 'GrowthBook',
+const _coreAny = SentryCore as unknown as Record<string, any>;
 
-    setupOnce() {
-      const proto = growthbookClass.prototype as GrowthBook;
-      fill(proto, 'isOn', _wrapBooleanReturningMethod);
-      fill(proto, 'getFeatureValue', _wrapBooleanReturningMethod);
-      // Also capture evalFeature when present. Not all versions have it, so guard.
-      if (typeof (proto as unknown as Record<string, unknown>).evalFeature === 'function') {
-        fill(proto as any, 'evalFeature', _wrapBooleanReturningMethod as any);
-      }
-    },
-
-    processEvent(event: Event, _hint: EventHint, _client: Client): Event {
-      return _INTERNAL_copyFlagsFromScopeToEvent(event);
-    },
-  };
-}) satisfies IntegrationFn;
-
-function _wrapBooleanReturningMethod(
-  original: (this: GrowthBook, ...args: unknown[]) => unknown,
-): (this: GrowthBook, ...args: unknown[]) => unknown {
-  return function (this: GrowthBook, ...args: unknown[]): unknown {
-    const flagName = args[0];
-    const result = original.apply(this, args);
-    // Capture any JSON-serializable result (booleans, strings, numbers, null, plain objects/arrays).
-    // Skip functions/symbols/undefined.
-    if (
-      typeof flagName === 'string' &&
-      typeof result !== 'undefined' &&
-      typeof result !== 'function' &&
-      typeof result !== 'symbol'
-    ) {
-      _INTERNAL_insertFlagToScope(flagName, result);
-      _INTERNAL_addFeatureFlagToActiveSpan(flagName, result);
-    }
-    return result;
-  };
-}
+export const growthbookIntegration = (({ growthbookClass }: { growthbookClass: GrowthBookClass }) =>
+  _coreAny.growthbookIntegration({ growthbookClass })) satisfies IntegrationFn;
diff --git a/packages/browser/src/integrations/featureFlags/growthbook/types.ts b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
index df0971235078..5a852d633da9 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/types.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/types.ts
@@ -1,6 +1,6 @@
 export interface GrowthBook {
-  isOn(this: GrowthBook, featureKey: string): boolean;
-  getFeatureValue(this: GrowthBook, featureKey: string, defaultValue: unknown): unknown;
+  isOn(this: GrowthBook, featureKey: string, ...rest: unknown[]): boolean;
+  getFeatureValue(this: GrowthBook, featureKey: string, defaultValue: unknown, ...rest: unknown[]): unknown;
 }
 
 // We only depend on the surface we wrap; constructor args are irrelevant here.
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index e0daefd54d76..d212fbc9127a 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -113,6 +113,7 @@ export { zodErrorsIntegration } from './integrations/zoderrors';
 export { thirdPartyErrorFilterIntegration } from './integrations/third-party-errors-filter';
 export { consoleIntegration } from './integrations/console';
 export { featureFlagsIntegration, type FeatureFlagsIntegration } from './integrations/featureFlags';
+export { growthbookIntegration } from './integrations/featureFlags';
 
 export { profiler } from './profiling';
 // eslint thinks the entire function is deprecated (while only one overload is actually deprecated)
diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
new file mode 100644
index 000000000000..24162d279c52
--- /dev/null
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -0,0 +1,70 @@
+import type { Client } from '../../client';
+import { defineIntegration } from '../../integration';
+import type { Event, EventHint } from '../../types-hoist/event';
+import type { IntegrationFn } from '../../types-hoist/integration';
+import {
+  _INTERNAL_addFeatureFlagToActiveSpan,
+  _INTERNAL_copyFlagsFromScopeToEvent,
+  _INTERNAL_insertFlagToScope,
+} from '../../utils/featureFlags';
+import { fill } from '../../utils/object';
+
+interface GrowthBookLike {
+  isOn(this: GrowthBookLike, featureKey: string, ...rest: unknown[]): boolean;
+  getFeatureValue(this: GrowthBookLike, featureKey: string, defaultValue: unknown, ...rest: unknown[]): unknown;
+}
+
+export type GrowthBookClassLike = new (...args: unknown[]) => GrowthBookLike;
+
+/**
+ * Sentry integration for capturing feature flag evaluations from GrowthBook.
+ *
+ * Only boolean results are captured at this time.
+ */
+export const growthbookIntegration = defineIntegration(
+  ({ growthbookClass }: { growthbookClass: GrowthBookClassLike }) => {
+    return {
+      name: 'GrowthBook',
+
+      setupOnce() {
+        const proto = growthbookClass.prototype as GrowthBookLike;
+
+        // Type guard and wrap isOn
+        if (typeof proto.isOn === 'function') {
+          fill(proto, 'isOn', _wrapAndCaptureBooleanResult);
+        }
+
+        // Type guard and wrap getFeatureValue
+        if (typeof proto.getFeatureValue === 'function') {
+          fill(proto, 'getFeatureValue', _wrapAndCaptureBooleanResult);
+        }
+
+        // Type guard and wrap evalFeature if present
+        const maybeEval = (proto as unknown as Record<string, unknown>).evalFeature;
+        if (typeof maybeEval === 'function') {
+          fill(proto as unknown as Record<string, unknown>, 'evalFeature', _wrapAndCaptureBooleanResult as any);
+        }
+      },
+
+      processEvent(event: Event, _hint: EventHint, _client: Client): Event {
+        return _INTERNAL_copyFlagsFromScopeToEvent(event);
+      },
+    };
+  },
+) satisfies IntegrationFn;
+
+function _wrapAndCaptureBooleanResult(
+  original: (this: GrowthBookLike, ...args: unknown[]) => unknown,
+): (this: GrowthBookLike, ...args: unknown[]) => unknown {
+  return function (this: GrowthBookLike, ...args: unknown[]): unknown {
+    const flagName = args[0];
+    const result = original.apply(this, args);
+
+    if (typeof flagName === 'string' && typeof result === 'boolean') {
+      _INTERNAL_insertFlagToScope(flagName, result);
+      _INTERNAL_addFeatureFlagToActiveSpan(flagName, result);
+    }
+
+    return result;
+  };
+}
diff --git a/packages/core/src/integrations/featureFlags/index.ts b/packages/core/src/integrations/featureFlags/index.ts
index 2106ee7accf0..f0ee5ece65b2 100644
--- a/packages/core/src/integrations/featureFlags/index.ts
+++ b/packages/core/src/integrations/featureFlags/index.ts
@@ -1 +1,2 @@
 export { featureFlagsIntegration, type FeatureFlagsIntegration } from './featureFlagsIntegration';
+export { growthbookIntegration } from './growthbook';
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
index a36bf6ba18c8..bc7aa49f77f2 100644
--- a/packages/node/src/integrations/featureFlagShims/growthbook.ts
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -1,17 +1,20 @@
-import { consoleSandbox, defineIntegration, isBrowser } from '@sentry/core';
+import {
+  defineIntegration,
+  growthbookIntegration as coreGrowthbookIntegration,
+  isBrowser,
+} from '@sentry/core';
 
 /**
  * Shim for the GrowthBook integration to avoid runtime errors when imported on the server.
  */
-export const growthbookIntegrationShim = defineIntegration((_options?: unknown) => {
-  if (!isBrowser()) {
-    consoleSandbox(() => {
-      // eslint-disable-next-line no-console
-      console.warn('The growthbookIntegration() can only be used in the browser.');
-    });
-  }
+export const growthbookIntegrationShim = defineIntegration(
+  (options: Parameters<typeof coreGrowthbookIntegration>[0]) => {
+    if (!isBrowser()) {
+      // On Node, just return the core integration so Node SDKs can also use it.
+      return coreGrowthbookIntegration(options);
+    }
 
-  return {
-    name: 'GrowthBook',
-  };
-});
+    // In browser, still return the integration to preserve behavior.
+    return coreGrowthbookIntegration(options);
+  },
+);

From f96d2046418724c7b7a315000b355c24fc22d31c Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 14:39:51 -0700
Subject: [PATCH 33/48] update tests

---
 .../featureFlags/growthbook/onError/basic/test.ts     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 77bbee30ea32..5b3cd7ac35b7 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -31,6 +31,16 @@ sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async
 
     gb.__setOn('feat3', true);
     gb.isOn('feat3'); // update
+
+    // Test getFeatureValue with boolean values (should be captured)
+    gb.__setFeatureValue('bool-feat', true);
+    gb.getFeatureValue('bool-feat', false);
+
+    // Test getFeatureValue with non-boolean values (should be ignored)
+    gb.__setFeatureValue('string-feat', 'hello');
+    gb.getFeatureValue('string-feat', 'default');
+    gb.__setFeatureValue('number-feat', 42);
+    gb.getFeatureValue('number-feat', 0);
   }, FLAG_BUFFER_SIZE);
 
   const reqPromise = waitForErrorRequest(page);
@@ -45,6 +55,7 @@ sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async
   }
   expectedFlags.push({ flag: `feat${FLAG_BUFFER_SIZE + 1}`, result: true });
   expectedFlags.push({ flag: 'feat3', result: true });
+  expectedFlags.push({ flag: 'bool-feat', result: true }); // Only boolean getFeatureValue should be captured
 
   expect(values).toEqual(expectedFlags);
 });

From d9c81686b5a1531bd1def59803b5215e62d0c8e2 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 18:49:15 -0700
Subject: [PATCH 34/48] remove evalFunction

---
 .../integrations/featureFlags/growthbook.ts    | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
index 24162d279c52..8fb5cc49cc0a 100644
--- a/packages/core/src/integrations/featureFlags/growthbook.ts
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -20,6 +20,19 @@ export type GrowthBookClassLike = new (...args: unknown[]) => GrowthBookLike;
  * Sentry integration for capturing feature flag evaluations from GrowthBook.
  *
  * Only boolean results are captured at this time.
+ *
+ * @example
+ * ```typescript
+ * import { GrowthBook } from '@growthbook/growthbook';
+ * import * as Sentry from '@sentry/browser'; // or '@sentry/node'
+ *
+ * Sentry.init({
+ *   dsn: 'your-dsn',
+ *   integrations: [
+ *     Sentry.growthbookIntegration({ growthbookClass: GrowthBook })
+ *   ]
+ * });
+ * ```
  */
 export const growthbookIntegration = defineIntegration(
   ({ growthbookClass }: { growthbookClass: GrowthBookClassLike }) => {
@@ -39,11 +52,6 @@ export const growthbookIntegration = defineIntegration(
           fill(proto, 'getFeatureValue', _wrapAndCaptureBooleanResult);
         }
 
-        // Type guard and wrap evalFeature if present
-        const maybeEval = (proto as unknown as Record<string, unknown>).evalFeature;
-        if (typeof maybeEval === 'function') {
-          fill(proto as unknown as Record<string, unknown>, 'evalFeature', _wrapAndCaptureBooleanResult as any);
-        }
       },
 
       processEvent(event: Event, _hint: EventHint, _client: Client): Event {

From 51e4716a0b8bab3d560a0993057b7a4d9fe8e7bd Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Tue, 23 Sep 2025 19:00:32 -0700
Subject: [PATCH 35/48] fix shim

---
 .../integrations/featureFlags/growthbook.ts   |  1 -
 .../featureFlagShims/growthbook.ts            | 21 ++++---------------
 2 files changed, 4 insertions(+), 18 deletions(-)

diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
index 8fb5cc49cc0a..a72e48e0f596 100644
--- a/packages/core/src/integrations/featureFlags/growthbook.ts
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -51,7 +51,6 @@ export const growthbookIntegration = defineIntegration(
         if (typeof proto.getFeatureValue === 'function') {
           fill(proto, 'getFeatureValue', _wrapAndCaptureBooleanResult);
         }
-
       },
 
       processEvent(event: Event, _hint: EventHint, _client: Client): Event {
diff --git a/packages/node/src/integrations/featureFlagShims/growthbook.ts b/packages/node/src/integrations/featureFlagShims/growthbook.ts
index bc7aa49f77f2..d86f3a0349bc 100644
--- a/packages/node/src/integrations/featureFlagShims/growthbook.ts
+++ b/packages/node/src/integrations/featureFlagShims/growthbook.ts
@@ -1,20 +1,7 @@
-import {
-  defineIntegration,
-  growthbookIntegration as coreGrowthbookIntegration,
-  isBrowser,
-} from '@sentry/core';
+import { growthbookIntegration as coreGrowthbookIntegration } from '@sentry/core';
 
 /**
- * Shim for the GrowthBook integration to avoid runtime errors when imported on the server.
+ * Re-export the core GrowthBook integration for Node.js usage.
+ * The core integration is runtime-agnostic and works in both browser and Node environments.
  */
-export const growthbookIntegrationShim = defineIntegration(
-  (options: Parameters<typeof coreGrowthbookIntegration>[0]) => {
-    if (!isBrowser()) {
-      // On Node, just return the core integration so Node SDKs can also use it.
-      return coreGrowthbookIntegration(options);
-    }
-
-    // In browser, still return the integration to preserve behavior.
-    return coreGrowthbookIntegration(options);
-  },
-);
+export const growthbookIntegrationShim = coreGrowthbookIntegration;

From 6e732506a324c5d8845aad3b2a31b6a3dcdd8a99 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:08:45 -0700
Subject: [PATCH 36/48] add node integration tests

---
 .../growthbook/onError/basic/scenario.ts      | 59 +++++++++++++++++++
 .../growthbook/onError/basic/test.ts          | 32 ++++++++++
 .../growthbook/onSpan/scenario.ts             | 50 ++++++++++++++++
 .../featureFlags/growthbook/onSpan/test.ts    | 34 +++++++++++
 packages/node/src/index.ts                    |  1 +
 5 files changed, 176 insertions(+)
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
 create mode 100644 dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts

diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
new file mode 100644
index 000000000000..2f37507f61d5
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
@@ -0,0 +1,59 @@
+import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
+import * as Sentry from '@sentry/node';
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+
+// Minimal GrowthBook-like class that matches the real API for testing
+// This is necessary since we don't want to add @growthbook/growthbook as a dependency
+// just for integration tests, but we want to test the actual integration behavior
+class GrowthBookLike {
+  private _features: Record<string, { value: unknown }> = {};
+
+  public isOn(featureKey: string): boolean {
+    const feature = this._features[featureKey];
+    return feature ? !!feature.value : false;
+  }
+
+  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
+    const feature = this._features[featureKey];
+    return feature ? feature.value : defaultValue;
+  }
+
+  // Helper method to set feature values for testing
+  public setFeature(featureKey: string, value: unknown): void {
+    this._features[featureKey] = { value };
+  }
+}
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  transport: loggingTransport,
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+});
+
+const gb = new GrowthBookLike();
+
+// Fill buffer with flags 1-100 (all false by default)
+for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
+  gb.isOn(`feat${i}`);
+}
+
+// Add feat101 (true), which should evict feat1
+gb.setFeature(`feat${FLAG_BUFFER_SIZE + 1}`, true);
+gb.isOn(`feat${FLAG_BUFFER_SIZE + 1}`);
+
+// Update feat3 to true, which should move it to the end
+gb.setFeature('feat3', true);
+gb.isOn('feat3');
+
+// Test getFeatureValue with boolean values (should be captured)
+gb.setFeature('bool-feat', true);
+gb.getFeatureValue('bool-feat', false);
+
+// Test getFeatureValue with non-boolean values (should NOT be captured)
+gb.setFeature('string-feat', 'hello');
+gb.getFeatureValue('string-feat', 'default');
+gb.setFeature('number-feat', 42);
+gb.getFeatureValue('number-feat', 0);
+
+throw new Error('Test error');
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
new file mode 100644
index 000000000000..a709c6329c93
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
@@ -0,0 +1,32 @@
+import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
+import { afterAll, test } from 'vitest';
+import { cleanupChildProcesses, createRunner } from '../../../../../utils/runner';
+
+afterAll(() => {
+  cleanupChildProcesses();
+});
+
+test('GrowthBook flags captured on error with eviction, update, and no async tasks', async () => {
+
+  const expectedFlags = [];
+  for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
+    expectedFlags.push({ flag: `feat${i}`, result: false });
+  }
+  expectedFlags.push({ flag: `feat${FLAG_BUFFER_SIZE + 1}`, result: true });
+  expectedFlags.push({ flag: 'feat3', result: true });
+  expectedFlags.push({ flag: 'bool-feat', result: true }); // Only boolean getFeatureValue should be captured
+
+  await createRunner(__dirname, 'scenario.ts')
+    .expect({
+      event: {
+        exception: { values: [{ type: 'Error', value: 'Test error' }] },
+        contexts: {
+          flags: {
+            values: expectedFlags,
+          },
+        },
+      },
+    })
+    .start()
+    .completed();
+});
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
new file mode 100644
index 000000000000..c66f340a4b63
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
@@ -0,0 +1,50 @@
+import * as Sentry from '@sentry/node';
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+
+// Minimal GrowthBook-like class that matches the real API for testing
+class GrowthBookLike {
+  private _features: Record<string, { value: unknown }> = {};
+
+  public isOn(featureKey: string): boolean {
+    const feature = this._features[featureKey];
+    return feature ? !!feature.value : false;
+  }
+
+  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
+    const feature = this._features[featureKey];
+    return feature ? feature.value : defaultValue;
+  }
+
+  // Helper method to set feature values for testing
+  public setFeature(featureKey: string, value: unknown): void {
+    this._features[featureKey] = { value };
+  }
+}
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  sampleRate: 1.0,
+  tracesSampleRate: 1.0,
+  transport: loggingTransport,
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+});
+
+const gb = new GrowthBookLike();
+
+// Set up feature flags
+gb.setFeature('feat1', true);
+gb.setFeature('feat2', false);
+gb.setFeature('bool-feat', true);
+
+Sentry.startSpan({ name: 'test-span', op: 'function' }, () => {
+  // Evaluate feature flags during the span
+  gb.isOn('feat1');
+  gb.isOn('feat2');
+
+  // Test getFeatureValue with boolean values (should be captured)
+  gb.getFeatureValue('bool-feat', false);
+
+  // Test getFeatureValue with non-boolean values (should NOT be captured)
+  gb.setFeature('string-feat', 'hello');
+  gb.getFeatureValue('string-feat', 'default');
+});
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
new file mode 100644
index 000000000000..65446ed24289
--- /dev/null
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
@@ -0,0 +1,34 @@
+import { afterAll, expect, test } from 'vitest';
+import { cleanupChildProcesses, createRunner } from '../../../../utils/runner';
+
+afterAll(() => {
+  cleanupChildProcesses();
+});
+
+test('GrowthBook flags are added to active span attributes on span end', async () => {
+  await createRunner(__dirname, 'scenario.ts')
+    .expect({
+      transaction: {
+        contexts: {
+          trace: {
+            data: {
+              'flag.evaluation.feat1': true,
+              'flag.evaluation.feat2': false,
+              'flag.evaluation.bool-feat': true,
+              // string-feat should NOT be here since it's not boolean
+            },
+            op: 'function',
+            origin: 'manual',
+            status: 'ok',
+            span_id: expect.stringMatching(/[a-f0-9]{16}/),
+            trace_id: expect.stringMatching(/[a-f0-9]{32}/)
+          },
+        },
+        spans: [],
+        transaction: 'test-span',
+        type: 'transaction',
+      },
+    })
+    .start()
+    .completed();
+});
diff --git a/packages/node/src/index.ts b/packages/node/src/index.ts
index 4808f22b472b..b582e04e79e1 100644
--- a/packages/node/src/index.ts
+++ b/packages/node/src/index.ts
@@ -34,6 +34,7 @@ export {
   OpenFeatureIntegrationHook,
   statsigIntegration,
   unleashIntegration,
+  growthbookIntegration,
 } from './integrations/featureFlagShims';
 export { firebaseIntegration } from './integrations/tracing/firebase';
 

From 3e2d47baa93b3180515b4b8a51696aef9b102665 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:10:40 -0700
Subject: [PATCH 37/48] add exports to astro

---
 packages/astro/src/index.server.ts | 1 +
 packages/astro/src/index.types.ts  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/packages/astro/src/index.server.ts b/packages/astro/src/index.server.ts
index 790810e93797..da213171070d 100644
--- a/packages/astro/src/index.server.ts
+++ b/packages/astro/src/index.server.ts
@@ -158,6 +158,7 @@ export {
   OpenFeatureIntegrationHook,
   statsigIntegration,
   unleashIntegration,
+  growthbookIntegration,
 } from '@sentry/node';
 
 export { init } from './server/sdk';
diff --git a/packages/astro/src/index.types.ts b/packages/astro/src/index.types.ts
index ceb4fc6d8a51..b09a1cfa09d5 100644
--- a/packages/astro/src/index.types.ts
+++ b/packages/astro/src/index.types.ts
@@ -35,5 +35,6 @@ export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegra
 export declare const OpenFeatureIntegrationHook: typeof clientSdk.OpenFeatureIntegrationHook;
 export declare const statsigIntegration: typeof clientSdk.statsigIntegration;
 export declare const unleashIntegration: typeof clientSdk.unleashIntegration;
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 
 export default sentryAstro;

From 6b9d6a9df7fcdc68151efc6ab622c41cff18aa4d Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:11:06 -0700
Subject: [PATCH 38/48] export growthbook integration

---
 packages/aws-serverless/src/index.ts          | 1 +
 packages/bun/src/index.ts                     | 1 +
 packages/cloudflare/src/index.ts              | 1 +
 packages/deno/src/index.ts                    | 1 +
 packages/google-cloud-serverless/src/index.ts | 1 +
 5 files changed, 5 insertions(+)

diff --git a/packages/aws-serverless/src/index.ts b/packages/aws-serverless/src/index.ts
index f7e72ec908ae..93cf639c87f0 100644
--- a/packages/aws-serverless/src/index.ts
+++ b/packages/aws-serverless/src/index.ts
@@ -144,6 +144,7 @@ export {
   OpenFeatureIntegrationHook,
   statsigIntegration,
   unleashIntegration,
+  growthbookIntegration,
 } from '@sentry/node';
 
 export {
diff --git a/packages/bun/src/index.ts b/packages/bun/src/index.ts
index 2775cbc0624e..5ec1568229e4 100644
--- a/packages/bun/src/index.ts
+++ b/packages/bun/src/index.ts
@@ -156,6 +156,7 @@ export {
   wrapMcpServerWithSentry,
   featureFlagsIntegration,
   launchDarklyIntegration,
+  growthbookIntegration,
   buildLaunchDarklyFlagUsedHandler,
   openFeatureIntegration,
   OpenFeatureIntegrationHook,
diff --git a/packages/cloudflare/src/index.ts b/packages/cloudflare/src/index.ts
index d4afd80313b1..6f731cb8d980 100644
--- a/packages/cloudflare/src/index.ts
+++ b/packages/cloudflare/src/index.ts
@@ -97,6 +97,7 @@ export {
   consoleLoggingIntegration,
   createConsolaReporter,
   featureFlagsIntegration,
+  growthbookIntegration,
   logger,
 } from '@sentry/core';
 
diff --git a/packages/deno/src/index.ts b/packages/deno/src/index.ts
index 5f987b4459aa..57da7927b11b 100644
--- a/packages/deno/src/index.ts
+++ b/packages/deno/src/index.ts
@@ -89,6 +89,7 @@ export {
   updateSpanName,
   wrapMcpServerWithSentry,
   featureFlagsIntegration,
+  growthbookIntegration,
 } from '@sentry/core';
 
 export { DenoClient } from './client';
diff --git a/packages/google-cloud-serverless/src/index.ts b/packages/google-cloud-serverless/src/index.ts
index bab9dc3a1cbb..254f3de5e57f 100644
--- a/packages/google-cloud-serverless/src/index.ts
+++ b/packages/google-cloud-serverless/src/index.ts
@@ -139,6 +139,7 @@ export {
   featureFlagsIntegration,
   type FeatureFlagsIntegration,
   launchDarklyIntegration,
+  growthbookIntegration,
   buildLaunchDarklyFlagUsedHandler,
   openFeatureIntegration,
   OpenFeatureIntegrationHook,

From 59fe2fdd0eea8db75b9859a59f3d8c33e451376b Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 16:11:23 -0700
Subject: [PATCH 39/48] fix race condition

---
 .../featureFlags/growthbook/onError/basic/test.ts        | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
index 5b3cd7ac35b7..fc23f80927ff 100644
--- a/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/browser-integration-tests/suites/integrations/featureFlags/growthbook/onError/basic/test.ts
@@ -49,7 +49,14 @@ sentryTest('GrowthBook onError: basic eviction/update and no async tasks', async
   const event = envelopeRequestParser(req);
 
   const values = event.contexts?.flags?.values || [];
-  const expectedFlags = [{ flag: 'feat2', result: false }];
+
+  // After the sequence of operations:
+  // 1. feat1-feat100 are added (100 items)
+  // 2. feat101 is added, evicts feat1 (100 items: feat2-feat100, feat101)
+  // 3. feat3 is updated to true, moves to end (100 items: feat2, feat4-feat100, feat101, feat3)
+  // 4. bool-feat is added, evicts feat2 (100 items: feat4-feat100, feat101, feat3, bool-feat)
+
+  const expectedFlags = [];
   for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
     expectedFlags.push({ flag: `feat${i}`, result: false });
   }

From 3a9664d9c9784f0fa6ea013c300d00dd0f3b4f98 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 18:44:42 -0700
Subject: [PATCH 40/48] fix lint issues

---
 .../suites/featureFlags/growthbook/onError/basic/test.ts        | 1 -
 .../suites/featureFlags/growthbook/onSpan/test.ts               | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
index a709c6329c93..82e39eb62364 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/test.ts
@@ -7,7 +7,6 @@ afterAll(() => {
 });
 
 test('GrowthBook flags captured on error with eviction, update, and no async tasks', async () => {
-
   const expectedFlags = [];
   for (let i = 4; i <= FLAG_BUFFER_SIZE; i++) {
     expectedFlags.push({ flag: `feat${i}`, result: false });
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
index 65446ed24289..fbb084b98928 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/test.ts
@@ -21,7 +21,7 @@ test('GrowthBook flags are added to active span attributes on span end', async (
             origin: 'manual',
             status: 'ok',
             span_id: expect.stringMatching(/[a-f0-9]{16}/),
-            trace_id: expect.stringMatching(/[a-f0-9]{32}/)
+            trace_id: expect.stringMatching(/[a-f0-9]{32}/),
           },
         },
         spans: [],

From 18864b3d2f77d032434d45317df99d8a59d2fdf9 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 18:45:01 -0700
Subject: [PATCH 41/48] fix nuxt build issue

---
 packages/nuxt/src/index.types.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/nuxt/src/index.types.ts b/packages/nuxt/src/index.types.ts
index 4f006e0b5b07..7abb16d197e3 100644
--- a/packages/nuxt/src/index.types.ts
+++ b/packages/nuxt/src/index.types.ts
@@ -19,6 +19,7 @@ export declare const defaultStackParser: StackParser;
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;

From 958bd6d21a199f52f29ab92d5d6b4909e6dc1a4a Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 19:23:22 -0700
Subject: [PATCH 42/48] resolve import conflict

---
 packages/nextjs/src/index.types.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/nextjs/src/index.types.ts b/packages/nextjs/src/index.types.ts
index fe5a75bd5c8b..d982ebbc7559 100644
--- a/packages/nextjs/src/index.types.ts
+++ b/packages/nextjs/src/index.types.ts
@@ -142,6 +142,7 @@ export declare function wrapPageComponentWithSentry<C>(WrappingTarget: C): C;
 
 export { captureRequestError } from './common/captureRequestError';
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;

From 709fc90b49bf93b28bcb9f960052bf545f547eab Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Thu, 25 Sep 2025 22:27:38 -0700
Subject: [PATCH 43/48] fix type cast warning

---
 .../src/integrations/featureFlags/growthbook/integration.ts | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
index b05aebf97fab..560918535cce 100644
--- a/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
+++ b/packages/browser/src/integrations/featureFlags/growthbook/integration.ts
@@ -1,5 +1,5 @@
 import type { IntegrationFn } from '@sentry/core';
-import * as SentryCore from '@sentry/core';
+import { growthbookIntegration as coreGrowthbookIntegration } from '@sentry/core';
 import type { GrowthBookClass } from './types';
 
 /**
@@ -22,7 +22,5 @@ import type { GrowthBookClass } from './types';
  * Sentry.captureException(new Error('something went wrong'));
  * ```
  */
-const _coreAny = SentryCore as unknown as Record<string, any>;
-
 export const growthbookIntegration = (({ growthbookClass }: { growthbookClass: GrowthBookClass }) =>
-  _coreAny.growthbookIntegration({ growthbookClass })) satisfies IntegrationFn;
+  coreGrowthbookIntegration({ growthbookClass })) satisfies IntegrationFn;

From fcc38b880b50a7e739f8b6a14713f281ccd65a67 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 29 Sep 2025 14:06:09 -0700
Subject: [PATCH 44/48] export growthbook integration

---
 packages/deno/src/index.ts                      | 1 -
 packages/react-router/src/index.types.ts        | 1 +
 packages/remix/src/index.types.ts               | 1 +
 packages/solidstart/src/index.types.ts          | 1 +
 packages/sveltekit/src/index.types.ts           | 1 +
 packages/tanstackstart-react/src/index.types.ts | 1 +
 6 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/deno/src/index.ts b/packages/deno/src/index.ts
index 57da7927b11b..5f987b4459aa 100644
--- a/packages/deno/src/index.ts
+++ b/packages/deno/src/index.ts
@@ -89,7 +89,6 @@ export {
   updateSpanName,
   wrapMcpServerWithSentry,
   featureFlagsIntegration,
-  growthbookIntegration,
 } from '@sentry/core';
 
 export { DenoClient } from './client';
diff --git a/packages/react-router/src/index.types.ts b/packages/react-router/src/index.types.ts
index 150fc45a1e63..58566ba214fe 100644
--- a/packages/react-router/src/index.types.ts
+++ b/packages/react-router/src/index.types.ts
@@ -19,6 +19,7 @@ export declare const getDefaultIntegrations: (options: Options) => Integration[]
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/remix/src/index.types.ts b/packages/remix/src/index.types.ts
index d0df7397f612..cacbac00e591 100644
--- a/packages/remix/src/index.types.ts
+++ b/packages/remix/src/index.types.ts
@@ -33,6 +33,7 @@ export const close = runtime === 'client' ? clientSdk.close : serverSdk.close;
 export const flush = runtime === 'client' ? clientSdk.flush : serverSdk.flush;
 export const lastEventId = runtime === 'client' ? clientSdk.lastEventId : serverSdk.lastEventId;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/solidstart/src/index.types.ts b/packages/solidstart/src/index.types.ts
index 7725d1ad3d3c..7f7528a0dddb 100644
--- a/packages/solidstart/src/index.types.ts
+++ b/packages/solidstart/src/index.types.ts
@@ -26,6 +26,7 @@ export declare function lastEventId(): string | undefined;
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/sveltekit/src/index.types.ts b/packages/sveltekit/src/index.types.ts
index 108e262f9992..40c2f5ff848e 100644
--- a/packages/sveltekit/src/index.types.ts
+++ b/packages/sveltekit/src/index.types.ts
@@ -60,6 +60,7 @@ export declare function trackComponent(options: clientSdk.TrackingOptions): Retu
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;
diff --git a/packages/tanstackstart-react/src/index.types.ts b/packages/tanstackstart-react/src/index.types.ts
index 448ea35f637b..5a44af1b59d4 100644
--- a/packages/tanstackstart-react/src/index.types.ts
+++ b/packages/tanstackstart-react/src/index.types.ts
@@ -29,6 +29,7 @@ export declare const withErrorBoundary: typeof clientSdk.withErrorBoundary;
 
 export declare const logger: typeof clientSdk.logger | typeof serverSdk.logger;
 
+export declare const growthbookIntegration: typeof clientSdk.growthbookIntegration;
 export declare const launchDarklyIntegration: typeof clientSdk.launchDarklyIntegration;
 export declare const buildLaunchDarklyFlagUsedHandler: typeof clientSdk.buildLaunchDarklyFlagUsedHandler;
 export declare const openFeatureIntegration: typeof clientSdk.openFeatureIntegration;

From a8aeeb2c12d4cd9de749b574c8b8c99a702478c9 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 29 Sep 2025 14:22:51 -0700
Subject: [PATCH 45/48] Use actual growthbook instance for testing

---
 .../node-integration-tests/package.json       |  1 +
 .../growthbook/onError/basic/scenario.ts      | 72 +++++++++++++------
 .../growthbook/onSpan/scenario.ts             | 56 +++++++++------
 3 files changed, 87 insertions(+), 42 deletions(-)

diff --git a/dev-packages/node-integration-tests/package.json b/dev-packages/node-integration-tests/package.json
index 48073f2ac817..ccc545f625c8 100644
--- a/dev-packages/node-integration-tests/package.json
+++ b/dev-packages/node-integration-tests/package.json
@@ -26,6 +26,7 @@
     "@anthropic-ai/sdk": "0.63.0",
     "@aws-sdk/client-s3": "^3.552.0",
     "@google/genai": "^1.20.0",
+    "@growthbook/growthbook": "^1.6.1",
     "@hapi/hapi": "^21.3.10",
     "@hono/node-server": "^1.19.4",
     "@nestjs/common": "^11",
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
index 2f37507f61d5..3dadfade8713 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
@@ -1,26 +1,60 @@
+import type { ClientOptions, UserContext } from '@growthbook/growthbook';
+import { GrowthBookClient } from '@growthbook/growthbook';
 import { _INTERNAL_FLAG_BUFFER_SIZE as FLAG_BUFFER_SIZE } from '@sentry/core';
 import * as Sentry from '@sentry/node';
 import { loggingTransport } from '@sentry-internal/node-integration-tests';
 
-// Minimal GrowthBook-like class that matches the real API for testing
-// This is necessary since we don't want to add @growthbook/growthbook as a dependency
-// just for integration tests, but we want to test the actual integration behavior
-class GrowthBookLike {
-  private _features: Record<string, { value: unknown }> = {};
+// Wrapper class to instantiate GrowthBookClient
+class GrowthBookWrapper {
+  private _gbClient: GrowthBookClient;
+  private _userContext: UserContext = { attributes: { id: 'test-user-123' } };
 
-  public isOn(featureKey: string): boolean {
-    const feature = this._features[featureKey];
-    return feature ? !!feature.value : false;
+  public constructor(..._args: unknown[]) {
+    // Create GrowthBookClient with proper configuration
+    const clientOptions: ClientOptions = {
+      apiHost: 'https://cdn.growthbook.io',
+      clientKey: 'sdk-abc123'
+    };
+    this._gbClient = new GrowthBookClient(clientOptions);
+
+    // Create features for testing
+    const features = this._createTestFeatures();
+
+    this._gbClient.initSync({
+      payload: { features }
+    });
   }
 
-  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
-    const feature = this._features[featureKey];
-    return feature ? feature.value : defaultValue;
+  public isOn(featureKey: string, ..._rest: unknown[]): boolean {
+    return this._gbClient.isOn(featureKey, this._userContext);
   }
 
-  // Helper method to set feature values for testing
-  public setFeature(featureKey: string, value: unknown): void {
-    this._features[featureKey] = { value };
+  public getFeatureValue(featureKey: string, defaultValue: unknown, ..._rest: unknown[]): unknown {
+    return this._gbClient.getFeatureValue(featureKey, defaultValue as boolean | string | number, this._userContext);
+  }
+
+  private _createTestFeatures(): Record<string, { defaultValue: unknown }> {
+    const features: Record<string, { defaultValue: unknown }> = {};
+
+    // Fill buffer with flags 1-100 (all false by default)
+    for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
+      features[`feat${i}`] = { defaultValue: false };
+    }
+
+    // Add feat101 (true), which should evict feat1
+    features[`feat${FLAG_BUFFER_SIZE + 1}`] = { defaultValue: true };
+
+    // Update feat3 to true, which should move it to the end
+    features['feat3'] = { defaultValue: true };
+
+    // Test features with boolean values (should be captured)
+    features['bool-feat'] = { defaultValue: true };
+
+    // Test features with non-boolean values (should NOT be captured)
+    features['string-feat'] = { defaultValue: 'hello' };
+    features['number-feat'] = { defaultValue: 42 };
+
+    return features;
   }
 }
 
@@ -28,10 +62,11 @@ Sentry.init({
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
   sampleRate: 1.0,
   transport: loggingTransport,
-  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookWrapper })],
 });
 
-const gb = new GrowthBookLike();
+// Create GrowthBookWrapper instance
+const gb = new GrowthBookWrapper();
 
 // Fill buffer with flags 1-100 (all false by default)
 for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
@@ -39,21 +74,16 @@ for (let i = 1; i <= FLAG_BUFFER_SIZE; i++) {
 }
 
 // Add feat101 (true), which should evict feat1
-gb.setFeature(`feat${FLAG_BUFFER_SIZE + 1}`, true);
 gb.isOn(`feat${FLAG_BUFFER_SIZE + 1}`);
 
 // Update feat3 to true, which should move it to the end
-gb.setFeature('feat3', true);
 gb.isOn('feat3');
 
 // Test getFeatureValue with boolean values (should be captured)
-gb.setFeature('bool-feat', true);
 gb.getFeatureValue('bool-feat', false);
 
 // Test getFeatureValue with non-boolean values (should NOT be captured)
-gb.setFeature('string-feat', 'hello');
 gb.getFeatureValue('string-feat', 'default');
-gb.setFeature('number-feat', 42);
 gb.getFeatureValue('number-feat', 0);
 
 throw new Error('Test error');
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
index c66f340a4b63..8800711b9901 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
@@ -1,41 +1,56 @@
+import type { ClientOptions, InitSyncOptions, UserContext } from '@growthbook/growthbook';
+import { GrowthBookClient } from '@growthbook/growthbook';
 import * as Sentry from '@sentry/node';
 import { loggingTransport } from '@sentry-internal/node-integration-tests';
 
-// Minimal GrowthBook-like class that matches the real API for testing
-class GrowthBookLike {
-  private _features: Record<string, { value: unknown }> = {};
+// Wrapper class to instantiate GrowthBookClient
+class GrowthBookWrapper {
+  private _gbClient: GrowthBookClient;
+  private _userContext: UserContext = { attributes: { id: 'test-user-123' } };
 
-  public isOn(featureKey: string): boolean {
-    const feature = this._features[featureKey];
-    return feature ? !!feature.value : false;
+  public constructor(..._args: unknown[]) {
+    // Create GrowthBookClient and initialize it synchronously with payload
+    const clientOptions: ClientOptions = {
+      apiHost: 'https://cdn.growthbook.io',
+      clientKey: 'sdk-abc123'
+    };
+    this._gbClient = new GrowthBookClient(clientOptions);
+
+    // Create test features
+    const features = {
+      'feat1': { defaultValue: true },
+      'feat2': { defaultValue: false },
+      'bool-feat': { defaultValue: true },
+      'string-feat': { defaultValue: 'hello' }
+    };
+
+    // Initialize synchronously with payload
+    const initOptions: InitSyncOptions = {
+      payload: { features }
+    };
+
+    this._gbClient.initSync(initOptions);
   }
 
-  public getFeatureValue(featureKey: string, defaultValue: unknown): unknown {
-    const feature = this._features[featureKey];
-    return feature ? feature.value : defaultValue;
+  public isOn(featureKey: string, ..._rest: unknown[]): boolean {
+    return this._gbClient.isOn(featureKey, this._userContext);
   }
 
-  // Helper method to set feature values for testing
-  public setFeature(featureKey: string, value: unknown): void {
-    this._features[featureKey] = { value };
+  public getFeatureValue(featureKey: string, defaultValue: unknown, ..._rest: unknown[]): unknown {
+    return this._gbClient.getFeatureValue(featureKey, defaultValue as boolean | string | number, this._userContext);
   }
 }
 
+const gb = new GrowthBookWrapper();
+
 Sentry.init({
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
   sampleRate: 1.0,
   tracesSampleRate: 1.0,
   transport: loggingTransport,
-  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookLike })],
+  integrations: [Sentry.growthbookIntegration({ growthbookClass: GrowthBookWrapper })],
 });
 
-const gb = new GrowthBookLike();
-
-// Set up feature flags
-gb.setFeature('feat1', true);
-gb.setFeature('feat2', false);
-gb.setFeature('bool-feat', true);
-
 Sentry.startSpan({ name: 'test-span', op: 'function' }, () => {
   // Evaluate feature flags during the span
   gb.isOn('feat1');
@@ -45,6 +60,5 @@ Sentry.startSpan({ name: 'test-span', op: 'function' }, () => {
   gb.getFeatureValue('bool-feat', false);
 
   // Test getFeatureValue with non-boolean values (should NOT be captured)
-  gb.setFeature('string-feat', 'hello');
   gb.getFeatureValue('string-feat', 'default');
 });

From e1379cab18fb0a496a368dc20773a196d5e7597d Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 29 Sep 2025 22:12:10 -0700
Subject: [PATCH 46/48] fix linting issues

---
 .../featureFlags/growthbook/onError/basic/scenario.ts  |  4 ++--
 .../suites/featureFlags/growthbook/onSpan/scenario.ts  | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
index 3dadfade8713..f907e320696d 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onError/basic/scenario.ts
@@ -13,7 +13,7 @@ class GrowthBookWrapper {
     // Create GrowthBookClient with proper configuration
     const clientOptions: ClientOptions = {
       apiHost: 'https://cdn.growthbook.io',
-      clientKey: 'sdk-abc123'
+      clientKey: 'sdk-abc123',
     };
     this._gbClient = new GrowthBookClient(clientOptions);
 
@@ -21,7 +21,7 @@ class GrowthBookWrapper {
     const features = this._createTestFeatures();
 
     this._gbClient.initSync({
-      payload: { features }
+      payload: { features },
     });
   }
 
diff --git a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
index 8800711b9901..b25f36f00951 100644
--- a/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
+++ b/dev-packages/node-integration-tests/suites/featureFlags/growthbook/onSpan/scenario.ts
@@ -12,21 +12,21 @@ class GrowthBookWrapper {
     // Create GrowthBookClient and initialize it synchronously with payload
     const clientOptions: ClientOptions = {
       apiHost: 'https://cdn.growthbook.io',
-      clientKey: 'sdk-abc123'
+      clientKey: 'sdk-abc123',
     };
     this._gbClient = new GrowthBookClient(clientOptions);
 
     // Create test features
     const features = {
-      'feat1': { defaultValue: true },
-      'feat2': { defaultValue: false },
+      feat1: { defaultValue: true },
+      feat2: { defaultValue: false },
       'bool-feat': { defaultValue: true },
-      'string-feat': { defaultValue: 'hello' }
+      'string-feat': { defaultValue: 'hello' },
     };
 
     // Initialize synchronously with payload
     const initOptions: InitSyncOptions = {
-      payload: { features }
+      payload: { features },
     };
 
     this._gbClient.initSync(initOptions);

From 99aea897dba88dd69a10b565836fb040b7936c69 Mon Sep 17 00:00:00 2001
From: Madhu Chavva <madhu.chavva@gmail.com>
Date: Mon, 6 Oct 2025 15:08:53 -0700
Subject: [PATCH 47/48] add growthbook dep for integration tests

---
 yarn.lock | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/yarn.lock b/yarn.lock
index 3a6b6375c015..0a98bb01a623 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4336,6 +4336,13 @@
   dependencies:
     tslib "^2.4.0"
 
+"@growthbook/growthbook@^1.6.1":
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/@growthbook/growthbook/-/growthbook-1.6.1.tgz#4135c680397af3e5de8d2ab92defe2c6ed697fc5"
+  integrity sha512-GSvb7bNaBTfH54AZ0oQdnoyV/ZxN9NhDEIHOsRUiM+CSOPiodz0i8/+1O6Wg0wFEVgBxS5CGWffyd74fym43Xw==
+  dependencies:
+    dom-mutator "^0.6.0"
+
 "@handlebars/parser@~2.0.0":
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/@handlebars/parser/-/parser-2.0.0.tgz#5e8b7298f31ff8f7b260e6b7363c7e9ceed7d9c5"
@@ -14362,6 +14369,11 @@ dom-element-descriptors@^0.5.0, dom-element-descriptors@^0.5.1:
   resolved "https://registry.yarnpkg.com/dom-element-descriptors/-/dom-element-descriptors-0.5.1.tgz#3ebfcf64198f922dba928f84f7970bb571891317"
   integrity sha512-DLayMRQ+yJaziF4JJX1FMjwjdr7wdTr1y9XvZ+NfHELfOMcYDnCHneAYXAS4FT1gLILh4V0juMZohhH1N5FsoQ==
 
+dom-mutator@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/dom-mutator/-/dom-mutator-0.6.0.tgz#079d7a4b3e8981a562cd777548b99baab51d65c5"
+  integrity sha512-iCt9o0aYfXMUkz/43ZOAUFQYotjGB+GNbYJiJdz4TgXkyToXbbRy5S6FbTp72lRBtfpUMwEc1KmpFEU4CZeoNg==
+
 dom-serializer@^1.0.1:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/dom-serializer/-/dom-serializer-1.3.2.tgz#6206437d32ceefaec7161803230c7a20bc1b4d91"

From 6ade432a0c57304770b04aa2efce5cde2f2a34d7 Mon Sep 17 00:00:00 2001
From: Charly Gomez <charly.gomez@sentry.io>
Date: Tue, 14 Oct 2025 14:15:49 +0200
Subject: [PATCH 48/48] rm satisfies keyword

---
 packages/core/src/integrations/featureFlags/growthbook.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/integrations/featureFlags/growthbook.ts b/packages/core/src/integrations/featureFlags/growthbook.ts
index a72e48e0f596..eeb2b25341e9 100644
--- a/packages/core/src/integrations/featureFlags/growthbook.ts
+++ b/packages/core/src/integrations/featureFlags/growthbook.ts
@@ -34,7 +34,7 @@ export type GrowthBookClassLike = new (...args: unknown[]) => GrowthBookLike;
  * });
  * ```
  */
-export const growthbookIntegration = defineIntegration(
+export const growthbookIntegration: IntegrationFn = defineIntegration(
   ({ growthbookClass }: { growthbookClass: GrowthBookClassLike }) => {
     return {
       name: 'GrowthBook',
@@ -58,7 +58,7 @@ export const growthbookIntegration = defineIntegration(
       },
     };
   },
-) satisfies IntegrationFn;
+);
 
 function _wrapAndCaptureBooleanResult(
   original: (this: GrowthBookLike, ...args: unknown[]) => unknown,