feat(core): Expose isInitialized() to replace checking via getClient (#10296)

Currently, you can use `Sentry.getClient() !== undefined` to check if
Sentry was initialized. In v8, we want to change this so that this
_always_ returns a client (possibly a Noop client), so this check will
not work anymore there. Instead, we can provide a new util that does
this explicitly, where we can control what it checks under the hood.

Author: mydea

MIGRATION.md

@@ -10,6 +10,12 @@ npx @sentry/migr8@latest
 This will let you select which updates to run, and automatically update your code. Make sure to still review all code
 changes!
 
+## Deprecate using `getClient()` to check if the SDK was initialized
+
+In v8, `getClient()` will stop returning `undefined` if `Sentry.init()` was not called. For cases where this may be used
+to check if Sentry was actually initialized, using `getClient()` will thus not work anymore. Instead, you should use the
+new `Sentry.isInitialized()` utility to check this.
+
 ## Deprecate `getCurrentHub()`
 
 In v8, you will no longer have a Hub, only Scopes as a concept. This also means that `getCurrentHub()` will eventually

packages/astro/src/index.server.ts

@@ -28,6 +28,7 @@ export {
   // eslint-disable-next-line deprecation/deprecation
   getCurrentHub,
   getClient,
+  isInitialized,
   getCurrentScope,
   getGlobalScope,
   getIsolationScope,

packages/browser/src/exports.ts

@@ -40,6 +40,7 @@ export {
   // eslint-disable-next-line deprecation/deprecation
   getCurrentHub,
   getClient,
+  isInitialized,
   getCurrentScope,
   Hub,
   // eslint-disable-next-line deprecation/deprecation

packages/bun/src/index.ts

@@ -45,6 +45,7 @@ export {
   // eslint-disable-next-line deprecation/deprecation
   getCurrentHub,
   getClient,
+  isInitialized,
   getCurrentScope,
   getGlobalScope,
   getIsolationScope,

packages/core/src/exports.ts

@@ -394,6 +394,13 @@ export function getClient<C extends Client>(): C | undefined {
   return getCurrentHub().getClient<C>();
 }
 
+/**
+ * Returns true if Sentry has been properly initialized.
+ */
+export function isInitialized(): boolean {
+  return !!getClient();
+}
+
 /**
  * Get the currently active scope.
  */

packages/core/src/index.ts

@@ -31,6 +31,7 @@ export {
   withScope,
   withIsolationScope,
   getClient,
+  isInitialized,
   getCurrentScope,
   startSession,
   endSession,

packages/core/test/lib/exports.test.ts

@@ -1,3 +1,4 @@
+import { GLOBAL_OBJ } from '@sentry/utils';
 import {
   Hub,
   Scope,
@@ -16,6 +17,7 @@ import {
   withIsolationScope,
   withScope,
 } from '../../src';
+import { isInitialized } from '../../src/exports';
 import { TestClient, getDefaultTestClientOptions } from '../mocks/client';
 
 function getTestClient(): TestClient {
@@ -315,3 +317,19 @@ describe('session APIs', () => {
     });
   });
 });
+
+describe('isInitialized', () => {
+  it('returns false if no client is setup', () => {
+    GLOBAL_OBJ.__SENTRY__.hub = undefined;
+    expect(isInitialized()).toBe(false);
+  });
+
+  it('returns true if client is setup', () => {
+    const client = getTestClient();
+    const hub = new Hub(client);
+    // eslint-disable-next-line deprecation/deprecation
+    makeMain(hub);
+
+    expect(isInitialized()).toBe(true);
+  });
+});

packages/deno/src/index.ts

@@ -44,6 +44,7 @@ export {
   // eslint-disable-next-line deprecation/deprecation
   getCurrentHub,
   getClient,
+  isInitialized,
   getCurrentScope,
   getGlobalScope,
   getIsolationScope,

packages/node-experimental/src/index.ts

@@ -17,6 +17,7 @@ export type { Span } from './types';
 export { startSpan, startSpanManual, startInactiveSpan, getActiveSpan } from '@sentry/opentelemetry';
 export {
   getClient,
+  isInitialized,
   addBreadcrumb,
   captureException,
   captureEvent,

packages/node-experimental/src/sdk/api.ts

@@ -22,9 +22,9 @@ import { getContextFromScope, getScopesFromContext, setScopesOnContext } from '.
 import type { ExclusiveEventHintOrCaptureContext } from '../utils/prepareEvent';
 import { parseEventHintOrCaptureContext } from '../utils/prepareEvent';
 import type { Scope } from './scope';
-import { getClient, getCurrentScope, getGlobalScope, getIsolationScope } from './scope';
+import { getClient, getCurrentScope, getGlobalScope, getIsolationScope, isInitialized } from './scope';
 
-export { getCurrentScope, getGlobalScope, getIsolationScope, getClient };
+export { getCurrentScope, getGlobalScope, getIsolationScope, getClient, isInitialized };
 export { setCurrentScope, setIsolationScope } from './scope';
 
 /**