Feat: Add some more information for exceptions collected via FlutterError.onError

CHANGELOG.md

@@ -3,6 +3,7 @@
 * Enhancement: Call `toString()` on all non-serializable fields (#528)
 * Fix: Always call `Flutter.onError` in order to not swallow messages (#533)
 * Bump: Android SDK to 5.1.0-beta.6 (#535)
+* Feat: Collect more information for exceptions collected via `FlutterError.onError` (#538)
 
 # 6.0.0-beta.2
 

flutter/lib/src/default_integrations.dart

@@ -44,16 +44,31 @@ class FlutterErrorIntegration extends Integration<SentryFlutterOptions> {
   void call(Hub hub, SentryFlutterOptions options) {
     _defaultOnError = FlutterError.onError;
     _integrationOnError = (FlutterErrorDetails errorDetails) async {
-      dynamic exception = errorDetails.exception;
+      final exception = errorDetails.exception;
 
       options.logger(
         SentryLevel.debug,
         'Capture from onError $exception',
       );
 
       if (errorDetails.silent != true || options.reportSilentFlutterErrors) {
+        final context = errorDetails.context?.toDescription();
+
+        final collector = errorDetails.informationCollector?.call() ?? [];
+        final information =
+            (StringBuffer()..writeAll(collector, '\n')).toString();
+        final library = errorDetails.library;
+
         // FlutterError doesn't crash the App.
-        final mechanism = Mechanism(type: 'FlutterError', handled: true);
+        final mechanism = Mechanism(
+          type: 'FlutterError',
+          handled: true,
+          data: {
+            if (context != null) 'context': context,
+            if (collector.isNotEmpty) 'information': information,
+            if (library != null) 'library': library,
+          },
+        );
         final throwableMechanism = ThrowableMechanism(mechanism, exception);
 
         var event = SentryEvent(

flutter/test/default_integrations_test.dart

@@ -46,6 +46,9 @@ void main() {
     final details = FlutterErrorDetails(
       exception: throwable,
       silent: silent,
+      context: DiagnosticsNode.message('while handling a gesture'),
+      library: 'sentry',
+      informationCollector: () => [DiagnosticsNode.message('foo bar')],
     );
     FlutterError.reportError(details);
   }
@@ -64,6 +67,10 @@ void main() {
     final throwableMechanism = event.throwableMechanism as ThrowableMechanism;
     expect(throwableMechanism.mechanism.type, 'FlutterError');
     expect(throwableMechanism.mechanism.handled, true);
+    expect(throwableMechanism.mechanism.data['library'], 'sentry');
+    expect(throwableMechanism.mechanism.data['context'],
+        'while handling a gesture');
+    expect(throwableMechanism.mechanism.data['information'], 'foo bar');
     expect(throwableMechanism.throwable, exception);
   });