Update and fix lints, bump min SDK to Dart 3.1

.github/workflows/test-package.yml

@@ -47,7 +47,7 @@ jobs:
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest, windows-latest]
-        sdk: [3.0, dev]
+        sdk: [3.1, dev]
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
       - uses: dart-lang/setup-dart@f0ead981b4d9a35b37f30d36160575d60931ec30

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.2-wip
+
+- Require Dart 3.1
+
 ## 1.0.1
 
 - Update `ExpressionsProcessor.processFont` to handle null expressions.

pubspec.yaml

@@ -1,19 +1,19 @@
 name: csslib
-version: 1.0.1
+version: 1.0.2-wip
 description: A library for parsing and analyzing CSS (Cascading Style Sheets).
 repository: https://github.com/dart-lang/csslib
 
 topics:
   - css
 
 environment:
-  sdk: ^3.0.0
+  sdk: ^3.1.0
 
 dependencies:
   source_span: ^1.8.0
 
 dev_dependencies:
-  dart_flutter_team_lints: ^2.0.0
+  dart_flutter_team_lints: ^3.0.0
   path: ^1.8.0
   term_glyph: ^1.2.0
   test: ^1.16.0

test/testing.dart

@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Common definitions used for setting up the test environment.
-library testing;
+library;
 
 import 'package:csslib/parser.dart';
 import 'package:csslib/visitor.dart';

test/third_party_samples_test.dart

@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
-library samples_test;
+library;
 
 import 'dart:io';