diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/init.js b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/init.js
new file mode 100644
index 000000000000..ae9f3bca884b
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/init.js
@@ -0,0 +1,5 @@
+window.sentryOnLoad = function () {
+ Sentry.init({});
+
+ window.__sentryLoaded = true;
+}
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/subject.js b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/subject.js
new file mode 100644
index 000000000000..4f05dfef870b
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/subject.js
@@ -0,0 +1,3 @@
+Sentry.forceLoad();
+
+Sentry.captureException('Test exception');
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/template.html b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/template.html
new file mode 100644
index 000000000000..0d9a99ec4f94
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/template.html
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/test.ts b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/test.ts
new file mode 100644
index 000000000000..e4a2bf12e829
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/keepSentryGlobal/test.ts
@@ -0,0 +1,24 @@
+import { expect } from '@playwright/test';
+
+import { sentryTest } from '../../../../utils/fixtures';
+import { envelopeRequestParser, waitForErrorRequestOnUrl } from '../../../../utils/helpers';
+
+sentryTest('keeps data on window.Sentry intact', async ({ getLocalTestUrl, page }) => {
+ 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 });
+ const req = await waitForErrorRequestOnUrl(page, url);
+
+ const eventData = envelopeRequestParser(req);
+
+ expect(eventData.message).toBe('Test exception');
+
+ const customThingy = await page.evaluate('window.Sentry._customThingOnSentry');
+ expect(customThingy).toBe('customThingOnSentry');
+});
diff --git a/dev-packages/rollup-utils/bundleHelpers.mjs b/dev-packages/rollup-utils/bundleHelpers.mjs
index 66bded3b62de..9a07db039559 100644
--- a/dev-packages/rollup-utils/bundleHelpers.mjs
+++ b/dev-packages/rollup-utils/bundleHelpers.mjs
@@ -54,6 +54,9 @@ export function makeBaseBundleConfig(options) {
// Add polyfills for ES6 array/string methods at the end of the bundle
return isEs5 ? getEs5Polyfills() : '';
},
+ intro: () => {
+ return 'exports = window.Sentry || {};';
+ },
},
context: 'window',
plugins: [rrwebBuildPlugin, markAsBrowserBuildPlugin],