fix(catchers): validate beforeSend return value to avoid sending invalid payload

packages/javascript/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hawk.so/javascript",
-  "version": "3.2.13",
+  "version": "3.2.14",
   "description": "JavaScript errors tracking for Hawk.so",
   "files": [
     "dist"

packages/javascript/src/catcher.ts

@@ -10,7 +10,7 @@
   EventContext,
   JavaScriptAddons,
   VueIntegrationAddons,
   Json, EncodedIntegrationToken, DecodedIntegrationToken,
 } from '@hawk.so/types';
 import type { JavaScriptCatcherIntegrations } from './types/integrations';
 import { EventRejectedError } from './errors';
@@ -440,8 +440,10 @@
 
       if (beforeSendResult === false) {
         throw new EventRejectedError('Event rejected by beforeSend method.');
-      } else {
+      } else if (typeof beforeSendResult === 'object' && beforeSendResult !== null) {
         payload = beforeSendResult;
+      } else if (beforeSendResult !== undefined) {
+        log('beforeSend must return event object or false. Received: ' + typeof beforeSendResult, 'warn');
       }
     }