UnsupportedError (Unsupported operation: Cannot modify unmodifiable map) when calling Event.exception

[andrewkolos]

The flutter tool pubroll is blocked on unified_analytics 6.1.5. See flutter/flutter#158347, where I documented my findings.

Consider the Event.exception constructor:

tools/pkgs/unified_analytics/lib/src/event.dart

Lines 452 to 459 in a6603a4

	Event.exception({
	required String exception,
	Map<String, Object?> data = const <String, Object?>{},
	}) : eventName = DashEvent.exception,
	eventData = {
	'exception': exception,
	...data..removeWhere((key, value) => value == null),
	};

Notice that the default argument for data is a const map literal, for which I assume removeWhere is not permitted.

[andrewkolos]

Assigning to @kenzieschmoll since they 1) have more context on the change that introduced this and 2) from talking to Ben, it sounds like the fix would need to be propagated to places other than the flutter tool that I am not aware of.