In the Event.exception constructor, modify a clone of the args argument instead of args itself (#1200)

Author: andrewkolos

pkgs/unified_analytics/CHANGELOG.md

@@ -1,3 +1,6 @@
+## 6.1.6
+- Fixed `UnsupportedError` thrown when Event.exception is called without providing a value for `args`.
+
 ## 6.1.5
 - Remove any `data` entries with a null value in the `Event.exception` constructor.
 

pkgs/unified_analytics/lib/src/constants.dart

@@ -26,7 +26,7 @@ const String kConfigString = '''
 # All other lines are configuration lines. They have
 # the form "name=value". If multiple lines contain
 # the same configuration name with different values,
-# the parser will default to a conservative value. 
+# the parser will default to a conservative value.
 
 # DISABLING TELEMETRY REPORTING
 #
@@ -87,7 +87,7 @@ const int kMaxLogFileSize = 25 * (1 << 20);
 const String kLogFileName = 'dart-flutter-telemetry.log';
 
 /// The current version of the package, should be in line with pubspec version.
-const String kPackageVersion = '6.1.5';
+const String kPackageVersion = '6.1.6';
 
 /// The minimum length for a session.
 const int kSessionDurationMinutes = 30;

pkgs/unified_analytics/lib/src/event.dart

@@ -496,7 +496,7 @@ final class Event {
   })  : eventName = DashEvent.exception,
         eventData = {
           'exception': exception,
-          ...data..removeWhere((key, value) => value == null),
+          ...Map.from(data)..removeWhere((key, value) => value == null),
         };
 
   /// Event that is emitted from the flutter tool when a build invocation

pkgs/unified_analytics/pubspec.yaml

@@ -5,7 +5,7 @@ description: >-
 # LINT.IfChange
 # When updating this, keep the version consistent with the changelog and the
 # value in lib/src/constants.dart.
-version: 6.1.5
+version: 6.1.6
 # LINT.ThenChange(lib/src/constants.dart)
 repository: https://github.com/dart-lang/tools/tree/main/pkgs/unified_analytics
 

pkgs/unified_analytics/test/event_test.dart

@@ -443,6 +443,14 @@ void main() {
     expect(constructedEvent.eventData.length, 3);
   });
 
+  test('Event.exception constructor works when no data is provided', () {
+    Event generateEvent() => Event.exception(
+          exception: 'exception',
+        );
+
+    expect(generateEvent, returnsNormally);
+  });
+
   test('Event.timing constructed', () {
     Event generateEvent() => Event.timing(
           workflow: 'workflow',