Remove all dynamic calls and properly enforce lint rule

analysis_options_presubmit.yaml

@@ -20,6 +20,7 @@ analyzer:
 linter:
   rules:
     - always_declare_return_types
+    - avoid_dynamic_calls
     - avoid_single_cascade_in_expression_statements
     - avoid_unused_constructor_parameters
     - annotate_overrides

lib/src/dartdoc_options.dart

@@ -343,32 +343,32 @@ class ToolConfiguration {
         List<String> findCommand([String prefix = '']) {
           List<String> command;
           // If the command key is given, then it applies to all platforms.
-          var commandFrom = toolMap.containsKey('${prefix}command')
+          var commandFromKey = toolMap.containsKey('${prefix}command')
               ? '${prefix}command'
               : '$prefix${Platform.operatingSystem}';
-          if (toolMap.containsKey(commandFrom)) {
-            if (toolMap[commandFrom].value is String) {
-              command = [toolMap[commandFrom].toString()];
+          if (toolMap.containsKey(commandFromKey)) {
+            var commandFrom = toolMap[commandFromKey] as YamlNode;
+            if (commandFrom.value is String) {
+              command = [commandFrom.toString()];
               if (command[0].isEmpty) {
                 throw DartdocOptionError(
                     'Tool commands must not be empty. Tool $name command entry '
-                    '"$commandFrom" must contain at least one path.');
+                    '"$commandFromKey" must contain at least one path.');
               }
-            } else if (toolMap[commandFrom] is YamlList) {
-              command = (toolMap[commandFrom] as YamlList)
-                  .map<String>((node) => node.toString())
-                  .toList();
+            } else if (commandFrom is YamlList) {
+              command =
+                  commandFrom.map<String>((node) => node.toString()).toList();
               if (command.isEmpty) {
                 throw DartdocOptionError(
                     'Tool commands must not be empty. Tool $name command entry '
-                    '"$commandFrom" must contain at least one path.');
+                    '"$commandFromKey" must contain at least one path.');
               }
             } else {
               throw DartdocOptionError(
                   'Tool commands must be a path to an executable, or a list of '
                   'strings that starts with a path to an executable. '
-                  'The tool $name has a $commandFrom entry that is a '
-                  '${toolMap[commandFrom].runtimeType}');
+                  'The tool $name has a $commandFromKey entry that is a '
+                  '${commandFrom.runtimeType}');
             }
           }
           return command;
@@ -598,16 +598,17 @@ abstract class DartdocOption<T> {
       _OptionValueWithContext<Object> valueWithContext, String missingFilename);
 
   /// Call [_onMissing] for every path that does not exist.
-  void _validatePaths(_OptionValueWithContext<dynamic> valueWithContext) {
+  void _validatePaths(_OptionValueWithContext<Object> valueWithContext) {
     if (!mustExist) return;
     assert(isDir || isFile);
     List<String> resolvedPaths;
-    if (valueWithContext.value is String) {
+    var value = valueWithContext.value;
+    if (value is String) {
       resolvedPaths = [valueWithContext.resolvedValue];
-    } else if (valueWithContext.value is List<String>) {
-      resolvedPaths = valueWithContext.resolvedValue.toList();
-    } else if (valueWithContext.value is Map<String, String>) {
-      resolvedPaths = valueWithContext.resolvedValue.values.toList();
+    } else if (value is List<String>) {
+      resolvedPaths = (valueWithContext.resolvedValue as List).toList();
+    } else if (value is Map<String, String>) {
+      resolvedPaths = (valueWithContext.resolvedValue as Map).values.toList();
     } else {
       assert(
           false,
@@ -1120,19 +1121,18 @@ abstract class _DartdocFileOption<T> implements DartdocOption<T> {
   _OptionValueWithContext<Object> _valueAtFromFile(Folder dir) {
     var yamlFileData = _yamlAtDirectory(dir);
     var contextPath = yamlFileData.canonicalDirectoryPath;
-    dynamic yamlData = yamlFileData.data ?? {};
+    Object yamlData = yamlFileData.data ?? {};
     for (var key in keys) {
-      if (!yamlData.containsKey(key)) return null;
-      yamlData = yamlData[key] ?? {};
+      if (yamlData is Map && !yamlData.containsKey(key)) return null;
+      yamlData = (yamlData as Map)[key] ?? {};
     }
 
-    dynamic returnData;
+    Object returnData;
     if (_isListString) {
       if (yamlData is YamlList) {
-        returnData = <String>[];
-        for (var item in yamlData) {
-          returnData.add(item.toString());
-        }
+        returnData = [
+          for (var item in yamlData) item.toString(),
+        ];
       }
     } else if (yamlData is YamlMap) {
       // TODO(jcollins-g): This special casing is unfortunate.  Consider
@@ -1700,7 +1700,7 @@ Future<List<DartdocOption<Object>>> createDartdocOptions(
         help: 'Generate ONLY the docs for the Dart SDK.'),
     DartdocOptionArgSynth<String>('sdkDir',
         (DartdocSyntheticOption<String> option, Folder dir) {
-      if (!option.parent['sdkDocs'].valueAt(dir) &&
+      if (!(option.parent['sdkDocs'].valueAt(dir) as bool) &&
           (option.root['topLevelPackageMeta'].valueAt(dir) as PackageMeta)
               .requiresFlutter) {
         String flutterRoot = option.root['flutterRoot'].valueAt(dir);

lib/src/model/model_element.dart

@@ -1097,7 +1097,7 @@ abstract class ModelElement extends Canonicalization
         }
         if (params == null && element is FunctionTypedElement) {
           if (_originalMember != null) {
-            params = (_originalMember as dynamic).parameters;
+            params = (_originalMember as FunctionTypedElement).parameters;
           } else {
             params = (element as FunctionTypedElement).parameters;
           }

lib/src/package_meta.dart

@@ -379,8 +379,12 @@ class _FilePackageMeta extends PubPackageMeta {
 
   @override
   bool get requiresFlutter =>
-      _pubspec['environment']?.containsKey('flutter') == true ||
-      _pubspec['dependencies']?.containsKey('flutter') == true;
+      _environment?.containsKey('flutter') == true ||
+      _dependencies?.containsKey('flutter') == true;
+
+  YamlMap /*?*/ get _environment => _pubspec['environment'];
+
+  YamlMap /*?*/ get _dependencies => _pubspec['environment'];
 
   @override
   File getReadmeContents() =>

test/dartdoc_options_test.dart

@@ -63,7 +63,7 @@ void main() {
     dartdocOptionSetSynthetic.add(
         DartdocOptionSyntheticOnly<List<String>>('vegetableLoader',
             (DartdocSyntheticOption<List<String>> option, Folder dir) {
-      if (option.root['mySpecialInteger'].valueAt(dir) > 20) {
+      if ((option.root['mySpecialInteger'].valueAt(dir) as num) > 20) {
         return <String>['existing.dart'];
       } else {
         return <String>['not_existing.dart'];
@@ -81,7 +81,7 @@ void main() {
     dartdocOptionSetSynthetic.add(
         DartdocOptionArgSynth<String>('nonCriticalFileOption',
             (DartdocSyntheticOption<String> option, Folder dir) {
-      return option.root['vegetableLoader'].valueAt(dir).first;
+      return (option.root['vegetableLoader'].valueAt(dir) as List).first;
     }, resourceProvider, optionIs: OptionKind.file));
 
     dartdocOptionSetFiles = DartdocOptionSet('dartdoc', resourceProvider);

test/end2end/dartdoc_integration_test.dart

@@ -107,7 +107,7 @@ void main() {
     });
 
     test('missing a required file path prints a fatal-error', () async {
-      var outputLines = [];
+      var outputLines = <String>[];
       var impossiblePath = path.join(dartdocPath, 'impossible');
       await expectLater(
           () => subprocessLauncher.runStreamed(

tool/doc_packages.dart

@@ -124,17 +124,20 @@ Future<List<String>> _packageUrls(int page) {
   return http
       .get(Uri.parse('https://pub.dartlang.org/packages.json?page=$page'))
       .then((response) {
-    return List<String>.from(json.decode(response.body)['packages']);
+    var decodedJson = json.decode(response.body) as Map;
+    return List.of(decodedJson['packages']);
   });
 }
 
 Future<List<PackageInfo>> _getPackageInfos(List<String> packageUrls) {
   var futures = packageUrls.map((String p) {
     return http.get(Uri.parse(p)).then((response) {
-      var decodedJson = json.decode(response.body);
+      var decodedJson = json.decode(response.body) as Map;
       String name = decodedJson['name'];
-      var versions = List<Version>.from(
-          decodedJson['versions'].map((v) => Version.parse(v)));
+      var versions = [
+        for (var version in decodedJson['versions'] as List)
+          Version.parse(version as String),
+      ];
       return PackageInfo(name, Version.primary(versions));
     });
   }).toList();
@@ -216,8 +219,8 @@ Future<void> _exec(String command, List<String> args,
   });
 }
 
-bool _isOldSdkConstraint(var pubspecInfo) {
-  var environment = pubspecInfo['environment'];
+bool _isOldSdkConstraint(Map<String, dynamic> pubspecInfo) {
+  var environment = pubspecInfo['environment'] as Map;
   if (environment != null) {
     var sdk = environment['sdk'];
     if (sdk != null) {

tool/grind.dart

@@ -11,6 +11,7 @@ import 'package:dartdoc/src/package_meta.dart';
 import 'package:grinder/grinder.dart';
 import 'package:path/path.dart' as path;
 import 'package:yaml/yaml.dart' as yaml;
+import 'package:yaml/yaml.dart';
 
 import 'subprocess_launcher.dart';
 
@@ -402,7 +403,8 @@ WarningsCollection jsonMessageIterableToWarnings(Iterable<Map> messageIterable,
     if (message.containsKey('level') &&
         message['level'] == 'WARNING' &&
         message.containsKey('data')) {
-      warningTexts.add(message['data']['text']);
+      var data = message['data'] as Map;
+      warningTexts.add(data['text']);
     }
   }
   return warningTexts;
@@ -1001,15 +1003,11 @@ Future<void> checkChangelogHasVersion() async {
 
 String _getPackageVersion() {
   var pubspec = File('pubspec.yaml');
-  dynamic yamlDoc;
-  if (pubspec.existsSync()) {
-    yamlDoc = yaml.loadYaml(pubspec.readAsStringSync());
-  }
-  if (yamlDoc == null) {
+  if (!pubspec.existsSync()) {
     fail('Cannot find pubspec.yaml in ${Directory.current}');
   }
-  var version = yamlDoc['version'];
-  return version;
+  var yamlDoc = yaml.loadYaml(pubspec.readAsStringSync()) as YamlMap;
+  return yamlDoc['version'];
 }
 
 @Task('Rebuild generated files')

tool/subprocess_launcher.dart

@@ -198,7 +198,8 @@ class SubprocessLauncher {
         if (result.containsKey('message')) {
           line = result['message'];
         } else if (result.containsKey('data')) {
-          line = result['data']['text'];
+          var data = result['data'] as Map;
+          line = data['text'];
         }
       }
       return line.split('\n');