fix: Handles error with string cause (#4163)

Author: antonis

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Fixes
 
+- Handles error with string cause ([#4163](https://github.com/getsentry/sentry-react-native/pull/4163))
 - Use `appLaunchedInForeground` to determine invalid app start data on Android ([#4146](https://github.com/getsentry/sentry-react-native/pull/4146))
 - Upload source maps for all release variants on Android (not only the last found) ([#4125](https://github.com/getsentry/sentry-react-native/pull/4125))
 

src/js/integrations/nativelinkederrors.ts

@@ -13,7 +13,7 @@ import type {
   StackFrame,
   StackParser,
 } from '@sentry/types';
-import { isInstanceOf, isPlainObject } from '@sentry/utils';
+import { isInstanceOf, isPlainObject, isString } from '@sentry/utils';
 
 import type { NativeStackFrames } from '../NativeRNSentry';
 import { NATIVE } from '../wrapper';
@@ -103,7 +103,11 @@ function walkErrorTree(
 
   let exception: Exception;
   let exceptionDebugImages: DebugImage[] | undefined;
-  if ('stackElements' in linkedError) {
+  if (isString(linkedError)) {
+    exception = {
+      value: linkedError,
+    };
+  } else if ('stackElements' in linkedError) {
     // isJavaException
     exception = exceptionFromJavaStackElements(linkedError);
   } else if ('stackReturnAddresses' in linkedError) {

test/integrations/nativelinkederrors.test.ts

@@ -337,6 +337,43 @@ describe('NativeLinkedErrors', () => {
       }),
     );
   });
+
+  it('handles events with a string cause', async () => {
+    const actualEvent = await executeIntegrationFor(
+      {
+        exception: {
+          values: [
+            {
+              type: 'Error',
+              value: 'Captured exception',
+            },
+          ],
+        },
+      },
+      {
+        originalException: createNewError({
+          message: 'Error with string cause',
+          cause: 'string cause',
+        }),
+      },
+    );
+
+    expect(actualEvent).toEqual(
+      expect.objectContaining(<Partial<Event>>{
+        exception: {
+          values: [
+            {
+              type: 'Error',
+              value: 'Captured exception',
+            },
+            {
+              value: 'string cause',
+            },
+          ],
+        },
+      }),
+    );
+  });
 });
 
 function executeIntegrationFor(mockedEvent: Event, mockedHint: EventHint): Event | null {