fix(angular): remove afterSendEvent listener once root injector is destroyed

In this commit, we added cleanup logic to handle the removal of `afterSendEvent`,
which is set up within the Angular error handler. This fixes memory leaks that occur
when the event is still being handled after the root view is removed.

Author: arturovt

packages/angular/src/errorhandler.ts

@@ -1,5 +1,5 @@
 import { HttpErrorResponse } from '@angular/common/http';
-import type { ErrorHandler as AngularErrorHandler } from '@angular/core';
+import type { ErrorHandler as AngularErrorHandler, OnDestroy } from '@angular/core';
 import { Inject, Injectable } from '@angular/core';
 import * as Sentry from '@sentry/browser';
 import type { ReportDialogOptions } from '@sentry/browser';
@@ -80,12 +80,14 @@ function isErrorOrErrorLikeObject(value: unknown): value is Error {
  * Implementation of Angular's ErrorHandler provider that can be used as a drop-in replacement for the stock one.
  */
 @Injectable({ providedIn: 'root' })
-class SentryErrorHandler implements AngularErrorHandler {
+class SentryErrorHandler implements AngularErrorHandler, OnDestroy {
   protected readonly _options: ErrorHandlerOptions;
 
   /* indicates if we already registered our the afterSendEvent handler */
   private _registeredAfterSendEventHandler;
 
+  private _removeAfterSendEventListener: VoidFunction | null = null;
+
   public constructor(@Inject('errorHandlerOptions') options?: ErrorHandlerOptions) {
     this._registeredAfterSendEventHandler = false;
 
@@ -95,6 +97,12 @@ class SentryErrorHandler implements AngularErrorHandler {
     };
   }
 
+  public ngOnDestroy(): void {
+    if (this._removeAfterSendEventListener) {
+      this._removeAfterSendEventListener();
+    }
+  }
+
   /**
    * Method called for every value captured through the ErrorHandler
    */
@@ -119,7 +127,7 @@ class SentryErrorHandler implements AngularErrorHandler {
       const client = Sentry.getClient();
 
       if (client && !this._registeredAfterSendEventHandler) {
-        client.on('afterSendEvent', (event: Event) => {
+        this._removeAfterSendEventListener = client.on('afterSendEvent', (event: Event) => {
           if (!event.type && event.event_id) {
             runOutsideAngular(() => {
               Sentry.showReportDialog({ ...this._options.dialogOptions, eventId: event.event_id! });