Fix some type related lints

analysis_options.yaml

@@ -14,6 +14,7 @@ analyzer:
 
 linter:
   rules:
+    - always_declare_return_types
     - avoid_catching_errors
     - avoid_print
     - avoid_private_typedef_functions
@@ -26,6 +27,7 @@ linter:
     - missing_whitespace_between_adjacent_strings
     - no_adjacent_strings_in_list
     - no_runtimeType_toString
+    - omit_local_variable_types
     - only_throw_errors
     - package_api_docs
     - prefer_asserts_in_initializer_lists
@@ -36,6 +38,7 @@ linter:
     - sort_pub_dependencies
     - test_types_in_equals
     - throw_in_finally
+    - type_annotate_public_apis
     - unawaited_futures
     - unnecessary_lambdas
     - unnecessary_null_aware_assignments

lib/src/command.dart

@@ -354,7 +354,7 @@ abstract class PubTopLevel {
   log.Verbosity get verbosity;
   bool get trace;
 
-  static addColorFlag(ArgParser argParser) {
+  static void addColorFlag(ArgParser argParser) {
     argParser.addFlag(
       'color',
       help: 'Use colors in terminal output.\n'

lib/src/command/add.dart

@@ -684,7 +684,7 @@ Specify multiple sdk packages with descriptors.''');
       final name = ref.name;
       final resultId = resultPackages.firstWhere((id) => id.name == name);
 
-      Object? description = pubspecDescription(
+      final description = pubspecDescription(
         ref.withConstraint(
           constraint ??
               (ref.source is HostedSource

lib/src/command/cache_preload.dart

@@ -33,12 +33,12 @@ class CachePreloadCommand extends PubCommand {
       usageException('No package to preload given.');
     }
 
-    for (String packagePath in argResults.rest) {
+    for (final packagePath in argResults.rest) {
       if (!fileExists(packagePath)) {
         fail('Could not find file $packagePath.');
       }
     }
-    for (String archivePath in argResults.rest) {
+    for (final archivePath in argResults.rest) {
       final id = await cache.hosted.preloadPackage(archivePath, cache);
       final url = (id.description.description as HostedDescription).url;
 

lib/src/command/deps.dart

@@ -282,7 +282,9 @@ class DepsCommand extends PubCommand {
       buffer.writeln('- ${_labelPackage(package)}');
 
       for (var dep in package.dependencies.values) {
-        buffer.writeln('  - ${log.bold(dep.name)} ${log.gray(dep.constraint)}');
+        buffer.writeln(
+          '  - ${log.bold(dep.name)} ${log.gray(dep.constraint.toString())}',
+        );
       }
     }
   }

lib/src/command/uploader.dart

@@ -47,7 +47,7 @@ class UploaderCommand extends PubCommand {
 
   @override
   Future<void> runProtected() async {
-    String packageName = '<packageName>';
+    var packageName = '<packageName>';
     try {
       packageName = entrypoint.root.name;
     } on Exception catch (_) {

lib/src/command_runner.dart

@@ -209,7 +209,7 @@ class PubCommandRunner extends CommandRunner<int> implements PubTopLevel {
 
     if (depsRev == actualRev) return;
     log.warning("${log.yellow('Warning:')} the revision of pub in DEPS is "
-        '${log.bold(depsRev)},\n'
+        '${log.bold(depsRev.toString())},\n'
         'but ${log.bold(actualRev)} is checked out in '
         '${p.relative(pubRoot)}.\n\n');
   }

lib/src/exceptions.dart

@@ -115,7 +115,7 @@ class PackageIntegrityException extends PubHttpException {
 /// Returns whether [error] is a user-facing error object.
 ///
 /// This includes both [ApplicationException] and any dart:io errors.
-bool isUserFacingException(error) {
+bool isUserFacingException(Object error) {
   return error is ApplicationException ||
       error is AnalyzerErrorGroup ||
       error is IsolateSpawnException ||
@@ -148,7 +148,7 @@ class SourceSpanApplicationException extends SourceSpanFormatException
   }) : super(message, span);
 
   @override
-  String toString({color}) {
+  String toString({Object? color}) {
     return [
       if (explanation != null) explanation,
       span == null

lib/src/flutter_releases.dart

@@ -100,6 +100,6 @@ class FlutterRelease {
     required this.channel,
   });
   @override
-  toString() =>
+  String toString() =>
       'FlutterRelease(flutter=$flutterVersion, dart=$dartVersion, channel=$channel)';
 }

lib/src/global_packages.dart

@@ -214,7 +214,7 @@ class GlobalPackages {
     bool silent = false,
   }) async {
     final name = dep.name;
-    LockFile? originalLockFile = _describeActive(name, cache);
+    final originalLockFile = _describeActive(name, cache);
 
     // Create a dummy package with just [dep] so we can do resolution on it.
     var root = Package.inMemory(
@@ -251,7 +251,7 @@ class GlobalPackages {
     final sameVersions =
         originalLockFile != null && originalLockFile.samePackageIds(lockFile);
 
-    final PackageId id = lockFile.packages[name]!;
+    final id = lockFile.packages[name]!;
     if (sameVersions) {
       log.message('''
 The package $name is already activated at newest available version.
@@ -331,7 +331,7 @@ To recompile executables, first run `$topLevelProgram pub global deactivate $nam
           '"${description.path}".');
     } else {
       log.message('Package ${log.bold(name)} is currently active at version '
-          '${log.bold(id.version)}.');
+          '${log.bold(id.version.toString())}.');
     }
     return lockFile;
   }
@@ -724,10 +724,10 @@ try:
       for (var command in ordered(collided.keys)) {
         if (overwriteBinStubs) {
           log.warning('Replaced ${log.bold(command)} previously installed from '
-              '${log.bold(collided[command])}.');
+              '${log.bold(collided[command].toString())}.');
         } else {
           log.warning('Executable ${log.bold(command)} was already installed '
-              'from ${log.bold(collided[command])}.');
+              'from ${log.bold(collided[command].toString())}.');
         }
       }
 

lib/src/log.dart

@@ -204,7 +204,7 @@ class _Entry {
 ///
 /// If [error] is passed, it's appended to [message]. If [trace] is passed, it's
 /// printed at log level fine.
-void error(String message, [error, StackTrace? trace]) {
+void error(String message, [Object? error, StackTrace? trace]) {
   if (error != null) {
     message = message.isEmpty ? '$error' : '$message: $error';
     if (error is Error && trace == null) trace = error.stackTrace;
@@ -490,15 +490,13 @@ void unmuteProgress() {
 /// that supports that.
 ///
 /// Use this to highlight the most important piece of a long chunk of text.
-String bold(text) => '$_bold$text$_none';
+String bold(String text) => '$_bold$text$_none';
 
 /// Wraps [text] in the ANSI escape codes to make it gray when on a platform
 /// that supports that.
 ///
 /// Use this for text that's less important than the text around it.
-String gray(text) {
-  return '$_gray$text$_none';
-}
+String gray(String text) => '$_gray$text$_none';
 
 /// Wraps [text] in the ANSI escape codes to color it cyan when on a platform
 /// that supports that.
@@ -626,7 +624,7 @@ class _JsonLogger {
   }
 
   /// Encodes [message] to JSON and prints it if JSON output is enabled.
-  void message(message) {
+  void message(Map<String, String> message) {
     if (!enabled) return;
 
     stdout.writeln(jsonEncode(message));

lib/src/package_name.dart

@@ -49,7 +49,7 @@ class PackageRef {
       PackageRange(this, constraint);
 
   @override
-  bool operator ==(other) =>
+  bool operator ==(Object other) =>
       other is PackageRef &&
       name == other.name &&
       description == other.description;
@@ -95,7 +95,7 @@ class PackageId {
   int get hashCode => Object.hash(name, version, description);
 
   @override
-  bool operator ==(other) =>
+  bool operator ==(Object other) =>
       other is PackageId &&
       name == other.name &&
       version == other.version &&
@@ -208,7 +208,7 @@ class PackageRange {
   int get hashCode => Object.hash(_ref, constraint);
 
   @override
-  bool operator ==(other) =>
+  bool operator ==(Object other) =>
       other is PackageRange &&
       _ref == other._ref &&
       other.constraint == constraint;

lib/src/pub_embeddable_command.dart

@@ -49,7 +49,7 @@ class PubEmbeddableCommand extends PubCommand implements PubTopLevel {
   String get name => 'pub';
 
   @override
-  get suggestionAliases => const ['packages', 'pkg'];
+  List<String> get suggestionAliases => const ['packages', 'pkg'];
 
   @override
   String get description => 'Work with packages.';

lib/src/pubspec.dart

@@ -225,7 +225,7 @@ class Pubspec extends PubspecBase {
         pubspecPath,
       );
     }
-    String? overridesFileContents =
+    final overridesFileContents =
         allowOverridesFile && fileExists(overridesPath)
             ? readTextFile(overridesPath)
             : null;
@@ -613,7 +613,7 @@ class SdkConstraint {
     VersionConstraint originalConstraint, {
     required VersionConstraint? defaultUpperBoundConstraint,
   }) {
-    VersionConstraint constraint = originalConstraint;
+    var constraint = originalConstraint;
     if (defaultUpperBoundConstraint != null &&
         constraint is VersionRange &&
         constraint.max == null &&
@@ -676,7 +676,7 @@ class SdkConstraint {
   }
 
   @override
-  operator ==(other) =>
+  bool operator ==(Object other) =>
       other is SdkConstraint &&
       other.effectiveConstraint == effectiveConstraint &&
       other.originalConstraint == originalConstraint;

lib/src/pubspec_utils.dart

@@ -159,7 +159,7 @@ VersionConstraint stripUpperBound(VersionConstraint constraint) {
 ///
 /// The syntax used for hosted will depend on the language version of
 /// [relativeEntrypoint]
-Object? pubspecDescription(
+Object pubspecDescription(
   PackageRange range,
   SystemCache cache,
   Entrypoint relativeEntrypoint,

lib/src/source.dart

@@ -4,6 +4,7 @@
 
 import 'dart:async';
 
+import 'package:meta/meta.dart';
 import 'package:pub_semver/pub_semver.dart';
 
 import 'exceptions.dart';
@@ -78,7 +79,7 @@ abstract class Source {
   /// Throws a [FormatException] if the description is not valid.
   PackageRef parseRef(
     String name,
-    description, {
+    Object? description, {
     String? containingDir,
     required LanguageVersion languageVersion,
   });
@@ -96,7 +97,7 @@ abstract class Source {
   PackageId parseId(
     String name,
     Version version,
-    description, {
+    Object? description, {
     String? containingDir,
   });
 
@@ -183,10 +184,12 @@ abstract class Description {
   String format();
 
   @override
-  bool operator ==(other) =>
+  @mustBeOverridden
+  bool operator ==(Object other) =>
       throw UnimplementedError('Subclasses must override');
 
   @override
+  @mustBeOverridden
   int get hashCode => throw UnimplementedError('Subclasses must override');
 }
 
@@ -214,10 +217,12 @@ abstract class ResolvedDescription {
   String format() => description.format();
 
   @override
-  bool operator ==(other) =>
+  @mustBeOverridden
+  bool operator ==(Object other) =>
       throw UnimplementedError('Subclasses must override');
 
   @override
+  @mustBeOverridden
   int get hashCode => throw UnimplementedError('Subclasses must override');
 }
 

lib/src/source/git.dart

@@ -86,7 +86,7 @@ class GitSource extends CachedSource {
   PackageId parseId(
     String name,
     Version version,
-    description, {
+    Object? description, {
     String? containingDir,
   }) {
     if (description is! Map) {
@@ -357,7 +357,7 @@ class GitSource extends CachedSource {
     SystemCache cache,
   ) async {
     return await _pool.withResource(() async {
-      bool didUpdate = false;
+      var didUpdate = false;
       final ref = id.toRef();
       final description = ref.description;
       if (description is! GitDescription) {

lib/src/source/hosted.dart

@@ -225,7 +225,7 @@ class HostedSource extends CachedSource {
   @override
   PackageRef parseRef(
     String name,
-    description, {
+    Object? description, {
     String? containingDir,
     required LanguageVersion languageVersion,
   }) {
@@ -239,7 +239,7 @@ class HostedSource extends CachedSource {
   PackageId parseId(
     String name,
     Version version,
-    description, {
+    Object? description, {
     String? containingDir,
   }) {
     // Old pub versions only wrote `description: <pkg>` into the lock file.

lib/src/source/path.dart

@@ -59,7 +59,7 @@ class PathSource extends Source {
   @override
   PackageRef parseRef(
     String name,
-    description, {
+    Object? description, {
     String? containingDir,
     LanguageVersion? languageVersion,
   }) {
@@ -90,7 +90,7 @@ class PathSource extends Source {
   PackageId parseId(
     String name,
     Version version,
-    description, {
+    Object? description, {
     String? containingDir,
   }) {
     if (description is! Map) {

lib/src/source/root.dart

@@ -58,7 +58,7 @@ class RootSource extends Source {
   PackageId parseId(
     String name,
     Version version,
-    description, {
+    Object? description, {
     String? containingDir,
   }) {
     throw UnsupportedError('Trying to parse a root package description.');
@@ -67,7 +67,7 @@ class RootSource extends Source {
   @override
   PackageRef parseRef(
     String name,
-    description, {
+    Object? description, {
     String? containingDir,
     required LanguageVersion languageVersion,
   }) {