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feat(browser): Add mode option for the browser session integration #18997

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38d6a15
feat(browser): Add mode option for the browser session integration
JPeer264 Jan 27, 2026
e32b2e4
feat: BrowserSessionIntegration available in CDN/bundle
JPeer264 Jan 30, 2026
f300ff8
test: Verify if only one session exists
JPeer264 Feb 5, 2026
2484c0f
ref: mode -> lifecycle
JPeer264 Feb 5, 2026
f7824f4
chore: update size-limit
JPeer264 Feb 5, 2026
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4 changes: 2 additions & 2 deletions .size-limit.js
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Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,7 @@ module.exports = [
path: 'packages/vue/build/esm/index.js',
import: createImport('init', 'browserTracingIntegration'),
gzip: true,
limit: '44.1 KB',
limit: '45 KB',
},
// Svelte SDK (ESM)
{
Expand All @@ -178,7 +178,7 @@ module.exports = [
name: 'CDN Bundle',
path: createCDNPath('bundle.min.js'),
gzip: true,
limit: '28 KB',
limit: '29 KB',
},
{
name: 'CDN Bundle (incl. Tracing)',
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9 changes: 9 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/page-lifecycle/init.js
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@@ -0,0 +1,9 @@
import * as Sentry from '@sentry/browser';

window.Sentry = Sentry;

Sentry.init({
dsn: 'https://public@dsn.ingest.sentry.io/1337',
release: '0.1',
integrations: [Sentry.browserSessionIntegration({ lifecycle: 'page' })],
});
12 changes: 12 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/page-lifecycle/subject.js
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@@ -0,0 +1,12 @@
let clickCount = 0;

document.getElementById('navigate').addEventListener('click', () => {
clickCount++;
// Each click navigates to a different page
history.pushState({}, '', `/page-${clickCount}`);
});

document.getElementById('manual-session').addEventListener('click', () => {
Sentry.startSession();
Sentry.captureException('Test error from manual session');
});
10 changes: 10 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/page-lifecycle/template.html
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@@ -0,0 +1,10 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<button id="navigate">Navigate via pushState</button>
<button id="manual-session">Manual session</button>
</body>
</html>
72 changes: 72 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/page-lifecycle/test.ts
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@@ -0,0 +1,72 @@
import { expect } from '@playwright/test';
import type { SessionContext } from '@sentry/core';
import { sentryTest } from '../../../utils/fixtures';
import { getMultipleSentryEnvelopeRequests } from '../../../utils/helpers';

sentryTest('should start a session on pageload with page lifecycle.', async ({ getLocalTestUrl, page }) => {
const url = await getLocalTestUrl({ testDir: __dirname });

const sessions = await getMultipleSentryEnvelopeRequests<SessionContext>(page, 1, {
url,
envelopeType: 'session',
timeout: 2000,
});

expect(sessions.length).toBeGreaterThanOrEqual(1);
const session = sessions[0];
expect(session).toBeDefined();
expect(session.init).toBe(true);
expect(session.errors).toBe(0);
expect(session.status).toBe('ok');
});

sentryTest(
'should NOT start a new session on pushState navigation with page lifecycle.',
async ({ getLocalTestUrl, page }) => {
const url = await getLocalTestUrl({ testDir: __dirname });

const sessionsPromise = getMultipleSentryEnvelopeRequests<SessionContext>(page, 10, {
url,
envelopeType: 'session',
timeout: 4000,
});

const manualSessionsPromise = getMultipleSentryEnvelopeRequests<SessionContext>(page, 10, {
envelopeType: 'session',
timeout: 4000,
});

const eventsPromise = getMultipleSentryEnvelopeRequests<SessionContext>(page, 10, {
envelopeType: 'event',
timeout: 4000,
});

await page.waitForSelector('#navigate');

await page.locator('#navigate').click();
await page.locator('#navigate').click();
await page.locator('#navigate').click();

const sessions = (await sessionsPromise).filter(session => session.init);

expect(sessions.length).toBe(1);
Comment on lines +48 to +52
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@Lms24 Lms24 Jan 28, 2026 •
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l: What I like to do when I test that something is not sent, is to await an event after navigating so that we have some time before ending the tests. I guess in this case, we could wait for an error or a transaction event. There's still an assumption here that the session would have been sent before that event but I think that's reasonable and better than not waiting at all or waiting for a a specific time.

We could even make it more deterministic by:

  1. going to the page
  2. awaiting for the init session
  3. registering the request listener for additional sessions
  4. navigating
  5. waiting for the unrelated event
  6. asserting that no more session envelopes have been sent

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@JPeer264 JPeer264 Jan 30, 2026

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Those are very valid points. I'll try to implement these

expect(sessions[0].init).toBe(true);

// teardown and verify if nothing else got sent
await page.locator('#manual-session').click();

const newSessions = (await manualSessionsPromise).filter(session => session.init);
const events = await eventsPromise;

expect(newSessions.length).toBe(2);
expect(newSessions[0].init).toBe(true);
expect(newSessions[1].init).toBe(true);
expect(newSessions[1].sid).not.toBe(newSessions[0].sid);
expect(events).toEqual([
expect.objectContaining({
level: 'error',
message: 'Test error from manual session',
}),
]);
},
);
8 changes: 8 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/route-lifecycle/init.js
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@@ -0,0 +1,8 @@
import * as Sentry from '@sentry/browser';

window.Sentry = Sentry;

Sentry.init({
dsn: 'https://public@dsn.ingest.sentry.io/1337',
release: '0.1',
});
6 changes: 6 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/route-lifecycle/subject.js
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@@ -0,0 +1,6 @@
let clickCount = 0;

document.getElementById('navigate').addEventListener('click', () => {
clickCount++;
history.pushState({}, '', `/page-${clickCount}`);
});
9 changes: 9 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/route-lifecycle/template.html
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@@ -0,0 +1,9 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<button id="navigate">Navigate via pushState</button>
</body>
</html>
27 changes: 27 additions & 0 deletions dev-packages/browser-integration-tests/suites/sessions/route-lifecycle/test.ts
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@@ -0,0 +1,27 @@
import { expect } from '@playwright/test';
import type { SessionContext } from '@sentry/core';
import { sentryTest } from '../../../utils/fixtures';
import { getMultipleSentryEnvelopeRequests } from '../../../utils/helpers';

sentryTest(
'should start new sessions on pushState navigation with route lifecycle (default).',
async ({ getLocalTestUrl, page }) => {
const url = await getLocalTestUrl({ testDir: __dirname });

const sessionsPromise = getMultipleSentryEnvelopeRequests<SessionContext>(page, 10, {
url,
envelopeType: 'session',
timeout: 4000,
});

await page.waitForSelector('#navigate');

await page.locator('#navigate').click();
await page.locator('#navigate').click();
await page.locator('#navigate').click();

const sessions = (await sessionsPromise).filter(session => session.init);

expect(sessions.length).toBe(3);
},
);
1 change: 1 addition & 0 deletions packages/browser/src/exports.ts
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Expand Up @@ -102,5 +102,6 @@ export { globalHandlersIntegration } from './integrations/globalhandlers';
export { httpContextIntegration } from './integrations/httpcontext';
export { linkedErrorsIntegration } from './integrations/linkederrors';
export { browserApiErrorsIntegration } from './integrations/browserapierrors';
export { browserSessionIntegration } from './integrations/browsersession';

export { lazyLoadIntegration } from './utils/lazyLoadIntegration';
1 change: 0 additions & 1 deletion packages/browser/src/index.ts
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Expand Up @@ -75,7 +75,6 @@ export type { Span, FeatureFlagsIntegration } from '@sentry/core';
export { makeBrowserOfflineTransport } from './transports/offline';
export { browserProfilingIntegration } from './profiling/integration';
export { spotlightBrowserIntegration } from './integrations/spotlight';
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';
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37 changes: 28 additions & 9 deletions packages/browser/src/integrations/browsersession.ts
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Expand Up @@ -3,13 +3,30 @@ import { addHistoryInstrumentationHandler } from '@sentry-internal/browser-utils
import { DEBUG_BUILD } from '../debug-build';
import { WINDOW } from '../helpers';

interface BrowserSessionOptions {
/**
* Controls the session lifecycle - when new sessions are created.
*
* - `'route'`: A session is created on page load and on every navigation.
* This is the default behavior.
* - `'page'`: A session is created once when the page is loaded. Session is not
* updated on navigation. This is useful for webviews or single-page apps where
* URL changes should not trigger new sessions.
*
* @default 'route'
*/
lifecycle?: 'route' | 'page';
}

/**
* When added, automatically creates sessions which allow you to track adoption and crashes (crash free rate) in your Releases in Sentry.
* More information: https://docs.sentry.io/product/releases/health/
*
* Note: In order for session tracking to work, you need to set up Releases: https://docs.sentry.io/product/releases/
*/
export const browserSessionIntegration = defineIntegration(() => {
export const browserSessionIntegration = defineIntegration((options: BrowserSessionOptions = {}) => {
const lifecycle = options.lifecycle ?? 'route';

return {
name: 'BrowserSession',
setupOnce() {
Expand All @@ -26,14 +43,16 @@ export const browserSessionIntegration = defineIntegration(() => {
startSession({ ignoreDuration: true });
captureSession();

// We want to create a session for every navigation as well
addHistoryInstrumentationHandler(({ from, to }) => {
// Don't create an additional session for the initial route or if the location did not change
if (from !== undefined && from !== to) {
startSession({ ignoreDuration: true });
captureSession();
}
});
if (lifecycle === 'route') {
// We want to create a session for every navigation as well
addHistoryInstrumentationHandler(({ from, to }) => {
// Don't create an additional session for the initial route or if the location did not change
if (from !== undefined && from !== to) {
startSession({ ignoreDuration: true });
captureSession();
}
});
}
},
};
});
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