Remove unresolved-export warning.

lib/src/model/package_graph.dart

@@ -459,7 +459,6 @@ class PackageGraph with CommentReferable, Nameable {
       PackageWarning.invalidParameter ||
       PackageWarning.toolError ||
       PackageWarning.deprecated ||
-      PackageWarning.unresolvedExport ||
       PackageWarning.missingExampleFile ||
       PackageWarning.missingCodeBlockLanguage =>
         kind.messageFor([message])
@@ -513,19 +512,7 @@ class PackageGraph with CommentReferable, Nameable {
       return;
     }
     _reexportsTagged.add(key);
-    if (libraryElement == null) {
-      lastExportedElement!;
-      final lastExportedElementUri = lastExportedElement.uri;
-      final uri = lastExportedElementUri is DirectiveUriWithRelativeUriString
-          ? lastExportedElementUri.relativeUriString
-          : null;
-      warnOnElement(
-          findButDoNotCreateLibraryFor(lastExportedElement.enclosingElement!),
-          PackageWarning.unresolvedExport,
-          message: '"$uri"',
-          referredFrom: <Locatable>[topLevelLibrary]);
-      return;
-    }
+    if (libraryElement == null) return;
     _libraryExports.putIfAbsent(libraryElement, () => {}).add(topLevelLibrary);
     for (var exportedElement in libraryElement.libraryExports) {
       _tagReexportsFor(

lib/src/warnings.dart

@@ -279,12 +279,6 @@ enum PackageWarning implements Comparable<PackageWarning> {
     'deprecated dartdoc usage: {0}',
     shortHelp: 'A dartdoc directive has a deprecated format.',
   ),
-  unresolvedExport(
-    'unresolved-export',
-    'unresolved export uri: {0}',
-    shortHelp: 'An export refers to a URI that cannot be resolved.',
-    defaultWarningMode: PackageWarningMode.error,
-  ),
   missingExampleFile(
     'missing-example-file',
     'example file not found: {0}',

test/warnings_test.dart

@@ -7,10 +7,6 @@ library dartdoc.warnings_test;
 
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:dartdoc/src/dartdoc_options.dart';
-import 'package:dartdoc/src/generator/generator.dart';
-import 'package:dartdoc/src/io_utils.dart';
-import 'package:dartdoc/src/model/package_builder.dart';
-import 'package:dartdoc/src/package_config_provider.dart';
 import 'package:dartdoc/src/package_meta.dart';
 import 'package:dartdoc/src/warnings.dart';
 import 'package:test/test.dart';
@@ -59,7 +55,6 @@ void main() async {
 dartdoc:
   warnings:
     - type-as-html
-    - unresolved-export
   errors:
     - unresolved-doc-reference
   ignore:
@@ -89,7 +84,6 @@ dartdoc:
 dartdoc:
   warnings:
     - type-as-html
-    - unresolved-export
   errors:
     - unresolved-doc-reference
   ignore:
@@ -102,8 +96,6 @@ dartdoc:
 
     expect(options.warningModes[PackageWarning.typeAsHtml],
         equals(PackageWarningMode.warn));
-    expect(options.warningModes[PackageWarning.unresolvedExport],
-        equals(PackageWarningMode.warn));
     expect(options.warningModes[PackageWarning.unresolvedDocReference],
         equals(PackageWarningMode.error));
     expect(options.warningModes[PackageWarning.ambiguousReexport],
@@ -115,7 +107,6 @@ dartdoc:
 dartdoc:
   warnings:
     - type-as-html
-    - unresolved-export
   errors:
     - unresolved-doc-reference
   ignore:
@@ -127,14 +118,12 @@ dartdoc:
       '--errors',
       'type-as-html',
       '--ignore',
-      'unresolved-export',
+      '',
     ]);
     PackageWarningOptions options = optionSet['packageWarningOptions']
         .valueAt(resourceProvider.getFolder(d.dir('test_package').io.path));
     expect(options.warningModes[PackageWarning.typeAsHtml],
         equals(PackageWarningMode.error));
-    expect(options.warningModes[PackageWarning.unresolvedExport],
-        equals(PackageWarningMode.ignore));
     // `unresolved-doc-reference` is not mentioned in command line, so it
     // reverts to default.
     expect(options.warningModes[PackageWarning.unresolvedDocReference],
@@ -149,7 +138,6 @@ dartdoc:
 dartdoc:
   warnings:
     - type-as-html
-    - unresolved-export
   errors:
     - unresolved-doc-reference
   ignore:
@@ -168,82 +156,9 @@ dartdoc:
 
     expect(options.warningModes[PackageWarning.typeAsHtml],
         equals(PackageWarningMode.ignore));
-    expect(options.warningModes[PackageWarning.unresolvedExport],
-        equals(PackageWarningMode.error));
     expect(options.warningModes[PackageWarning.unresolvedDocReference],
         equals(PackageWarningMode.warn));
     expect(options.warningModes[PackageWarning.ambiguousReexport],
         equals(PackageWarningMode.warn));
   });
-
-  test('warns of a broken re-export chain', () async {
-    await d.createPackage(
-      'test_package',
-      pubspec: '''
-name: test_package
-version: 0.0.1
-environment:
-    sdk: '>=2.12.0 <3.0.0'
-dependencies:
-  test_package_export_error:
-    path: ../test_package_export_error
-''',
-      libFiles: [
-        d.file('lib.dart', '''
-export 'package:test_package_export_error/library2.dart';
-
-/// This is an important class.
-class BugFreeClass {}
-'''),
-      ],
-    );
-    await d.createPackage(
-      'test_package_export_error',
-      pubspec: '''
-name: test_package_export_error
-version: 0.0.1
-environment:
-    sdk: '>=2.12.0 <3.0.0'
-''',
-      libFiles: [
-        d.file('library1.dart', '''
-/// An export of a non-existent library.
-export 'package:not_referenced_in_pubspec/library3.dart' show Lib3Class;
-'''),
-        d.file('library2.dart', '''
-export 'package:test_package_export_error/library1.dart';
-
-class Lib2Class {}
-'''),
-      ],
-    );
-
-    var tempDir = resourceProvider.createSystemTemp('dartdoc.test.');
-
-    var optionSet = DartdocOptionRoot.fromOptionGenerators(
-        'dartdoc',
-        [
-          createDartdocOptions,
-          createGeneratorOptions,
-        ],
-        pubPackageMetaProvider);
-    optionSet.parseArguments(
-        ['--input', d.dir('test_package').io.path, '--output', tempDir.path]);
-    var context = DartdocGeneratorOptionContext.fromDefaultContextLocation(
-        optionSet, pubPackageMetaProvider.resourceProvider);
-
-    var packageGraph = await PubPackageBuilder(
-            context, pubPackageMetaProvider, PhysicalPackageConfigProvider(),
-            skipUnreachableSdkLibraries: true)
-        .buildPackageGraph();
-
-    var unresolvedExportWarnings = packageGraph
-        .packageWarningCounter.countedWarnings.values
-        .map((e) => e[PackageWarning.unresolvedExport] ?? {})
-        .expand((element) => element);
-
-    expect(unresolvedExportWarnings, hasLength(1));
-    expect(unresolvedExportWarnings.first,
-        equals('"package:not_referenced_in_pubspec/library3.dart"'));
-  });
 }