Multiple libraries export the same nameDRT-W1218

The analyzer produces this diagnostic when two or more export directives cause the same name to be exported from multiple libraries.

Example

Given a file a.dart containing

class C {}

And a file b.dart containing

class C {}

The following code produces this diagnostic because the name C is being exported from both a.dart and b.dart:

export 'a.dart';
export 'b.dart';

Common fixes

If none of the names in one of the libraries needs to be exported, then remove the unnecessary export directives:

export 'a.dart';

If all of the export directives are needed, then hide the name in all except one of the directives:

export 'a.dart';
export 'b.dart' hide C;