Verify type annotations on public APIs (#24).

lib/src/rules.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library linter.src.rules;
 
 import 'dart:collection';
 
 import 'package:linter/src/config.dart';
 import 'package:linter/src/linter.dart';
 import 'package:linter/src/rules/always_declare_return_types.dart';
 import 'package:linter/src/rules/always_specify_types.dart';
 import 'package:linter/src/rules/camel_case_types.dart';
 import 'package:linter/src/rules/constant_identifier_names.dart';
 import 'package:linter/src/rules/empty_constructor_bodies.dart';
 import 'package:linter/src/rules/implementation_imports.dart';
 import 'package:linter/src/rules/library_names.dart';
 import 'package:linter/src/rules/library_prefixes.dart';
 import 'package:linter/src/rules/non_constant_identifier_names.dart';
 import 'package:linter/src/rules/one_member_abstracts.dart';
 import 'package:linter/src/rules/package_api_docs.dart';
 import 'package:linter/src/rules/package_prefixed_library_names.dart';
 import 'package:linter/src/rules/prefer_is_not_empty.dart';
 import 'package:linter/src/rules/pub/package_names.dart';
 import 'package:linter/src/rules/slash_for_doc_comments.dart';
 import 'package:linter/src/rules/super_goes_last.dart';
+import 'package:linter/src/rules/type_annotate_public_apis.dart';
 import 'package:linter/src/rules/type_init_formals.dart';
 import 'package:linter/src/rules/unnecessary_brace_in_string_interp.dart';
 import 'package:linter/src/rules/unnecessary_getters_setters.dart';
 
 final Registry ruleRegistry = new Registry()
   ..register(new AlwaysDeclareReturnTypes())
   ..register(new AlwaysSpecifyTypes())
   ..register(new CamelCaseTypes())
   ..register(new ConstantIdentifierNames())
   ..register(new EmptyConstructorBodies())
   ..register(new ImplementationImports())
   ..register(new LibraryNames())
   ..register(new LibraryPrefixes())
   ..register(new NonConstantIdentifierNames())
   ..register(new PreferIsNotEmpty())
   ..register(new OneMemberAbstracts())
   ..register(new PackageApiDocs())
   ..register(new PackagePrefixedLibraryNames())
   ..register(new PubPackageNames())
   ..register(new SlashForDocComments())
   ..register(new SuperGoesLast())
   ..register(new TypeInitFormals())
+  ..register(new TypeAnnotatePublicApis())
   ..register(new UnnecessaryBraceInStringInterp())
   // Disabled pending fix: https://github.com/dart-lang/linter/issues/35
   //..register(new UnnecessaryGetters())
   ..register(new UnnecessaryGettersSetters());
 
 /// Registry of contributed lint rules.
 class Registry extends Object with IterableMixin<LintRule> {
   Map<String, LintRule> _ruleMap = <String, LintRule>{};
 
   @override
   Iterator<LintRule> get iterator => _ruleMap.values.iterator;
 
   Iterable<LintRule> get rules => _ruleMap.values;
 
   LintRule operator [](String key) => _ruleMap[key];
 
   /// All lint rules explicitly enabled by the given [config].
   ///
   /// For example:
   ///     my_rule: true
   ///
   /// enables `my_rule`.
-  /// 
+  ///
   /// Unspecified rules are treated as disabled by default.
   Iterable<LintRule> enabled(LintConfig config) => rules
       .where((rule) => config.ruleConfigs.any((rc) => rc.enables(rule.name)));
 
   void register(LintRule rule) {
     _ruleMap[rule.name] = rule;
   }
 }