fix(core): Return checkin id from client

packages/browser/test/unit/sdk.test.ts

@@ -1,6 +1,5 @@
 /* eslint-disable @typescript-eslint/unbound-method */
 import { createTransport, Scope } from '@sentry/core';
-import { MockIntegration } from '@sentry/core/test/lib/sdk.test';
 import type { Client, Integration } from '@sentry/types';
 import { resolvedSyncPromise } from '@sentry/utils';
 
@@ -18,6 +17,14 @@ function getDefaultBrowserOptions(options: Partial<BrowserOptions> = {}): Browse
   };
 }
 
+export class MockIntegration implements Integration {
+  public name: string;
+  public setupOnce: () => void = jest.fn();
+  public constructor(name: string) {
+    this.name = name;
+  }
+}
+
 jest.mock('@sentry/core', () => {
   const original = jest.requireActual('@sentry/core');
   return {

packages/core/src/exports.ts

@@ -196,17 +196,14 @@ export function startTransaction(
  * to create a monitor automatically when sending a check in.
  */
 export function captureCheckIn(checkIn: CheckIn, upsertMonitorConfig?: MonitorConfig): string {
-  const capturedCheckIn =
-    checkIn.status !== 'in_progress' && checkIn.checkInId ? checkIn : { ...checkIn, checkInId: uuid4() };
-
   const client = getCurrentHub().getClient();
   if (!client) {
     __DEBUG_BUILD__ && logger.warn('Cannot capture check-in. No client defined.');
   } else if (!client.captureCheckIn) {
     __DEBUG_BUILD__ && logger.warn('Cannot capture check-in. Client does not support sending check-ins.');
   } else {
-    client.captureCheckIn(capturedCheckIn, upsertMonitorConfig);
+    return client.captureCheckIn(checkIn, upsertMonitorConfig);
   }
 
-  return capturedCheckIn.checkInId;
+  return uuid4();
 }

packages/core/test/lib/sdk.test.ts

@@ -47,7 +47,7 @@ describe('captureCheckIn', () => {
       } as unknown as Client;
     });
 
-    expect(captureCheckIn({ monitorSlug: 'gogogo', status: 'in_progress' })).toStrictEqual(expect.any(String));
+    expect(captureCheckIn({ monitorSlug: 'gogogo', status: 'in_progress' })).toStrictEqual('some-id-wasd-1234');
   });
 
   it('returns an id when client is undefined', () => {