part_ of_ unnamed_ library
The library is unnamed. A URI is expected, not a library name '{0}', in the part-of directive.
Description
#
The analyzer produces this diagnostic when a library that doesn't have a
library
directive (and hence has no name) contains a
part
directive
and the
part of
directive in the
part file
uses a name to specify
the library that it's a part of.
Example
#
Given a
part file
named
part_file.dart
containing the following
code:
part of lib;
The following code produces this diagnostic because the library including the part file doesn't have a name even though the part file uses a name to specify which library it's a part of:
part 'part_file.dart';
Common fixes
#
Change the
part of
directive in the
part file
to specify its library
by URI:
part of 'test.dart';
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-4. View source or report an issue.