diff --git a/packages/sealed_countries/lib/src/model/country/submodels/world_country.dart b/packages/sealed_countries/lib/src/model/country/submodels/world_country.dart
index 3f874884..9e8008e0 100644
--- a/packages/sealed_countries/lib/src/model/country/submodels/world_country.dart
+++ b/packages/sealed_countries/lib/src/model/country/submodels/world_country.dart
@@ -213,6 +213,7 @@ class WorldCountry extends Country
   factory WorldCountry.fromCodeNumeric(
     Object codeNumeric, [
     Iterable<WorldCountry>? countries,
+    // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   ]) {
     if (countries == null) return codeNumericMap.findByCodeOrThrow(codeNumeric);
     final trimmedCode = codeNumeric.toUpperCaseIsoCode();
diff --git a/packages/sealed_countries/lib/src/model/regional_bloc/regional_bloc.dart b/packages/sealed_countries/lib/src/model/regional_bloc/regional_bloc.dart
index 7d9afbc9..b78fadfb 100644
--- a/packages/sealed_countries/lib/src/model/regional_bloc/regional_bloc.dart
+++ b/packages/sealed_countries/lib/src/model/regional_bloc/regional_bloc.dart
@@ -40,6 +40,7 @@ class RegionalBloc extends WorldBloc {
   factory RegionalBloc.fromAcronym(
     Object acronym, [
     Iterable<RegionalBloc>? blocs,
+    // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   ]) {
     final string = acronym.toUpperCaseIsoCode();
     if (blocs == null) return map[string]!;
diff --git a/packages/sealed_currencies/lib/src/model/currency/submodels/fiat_currency.dart b/packages/sealed_currencies/lib/src/model/currency/submodels/fiat_currency.dart
index 80cdfaa0..5180d9fa 100644
--- a/packages/sealed_currencies/lib/src/model/currency/submodels/fiat_currency.dart
+++ b/packages/sealed_currencies/lib/src/model/currency/submodels/fiat_currency.dart
@@ -152,6 +152,7 @@ class FiatCurrency extends Currency
   factory FiatCurrency.fromName(
     Object name, [
     Iterable<FiatCurrency> currencies = listExtended,
+    // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   ]) {
     final upperCaseName = name.toUpperCaseIsoCode();
 
diff --git a/packages/sealed_languages/lib/src/helpers/extensions/iso_standardized_string_extension.dart b/packages/sealed_languages/lib/src/helpers/extensions/iso_standardized_string_extension.dart
index 92a17844..c513339d 100644
--- a/packages/sealed_languages/lib/src/helpers/extensions/iso_standardized_string_extension.dart
+++ b/packages/sealed_languages/lib/src/helpers/extensions/iso_standardized_string_extension.dart
@@ -108,13 +108,13 @@ extension IsoStandardizedStringExtension on String {
     T Function(String code)? regular,
     T Function(String code)? short,
   }) {
-    final code = minLength == maxLength
+    final code = (minLength == maxLength)
         ? maybeToValidIsoCode(exactLength: minLength)
         : maybeToValidIsoCode(maxLength: maxLength, minLength: minLength);
     if (code == null) return orElse(this);
 
     return code.length == IsoStandardized.codeShortLength
-        ? short?.call(code.toUpperCase()) ?? orElse(code)
+        ? (short?.call(code.toUpperCase()) ?? orElse(code))
         : _onNumericOrRegular(code, orElse, regular: regular, numeric: numeric);
   }
 
@@ -127,7 +127,7 @@ extension IsoStandardizedStringExtension on String {
     if (numeric == null && regular == null) return orElse(code);
 
     return RegExp("[a-z]", caseSensitive: false).hasMatch(code)
-        ? regular?.call(code) ?? orElse(code)
-        : numeric?.call(code) ?? orElse(code);
+        ? (regular?.call(code) ?? orElse(code))
+        : (numeric?.call(code) ?? orElse(code));
   }
 }
diff --git a/packages/sealed_languages/lib/src/model/language/submodels/natural_language.dart b/packages/sealed_languages/lib/src/model/language/submodels/natural_language.dart
index a1d11205..0a8c11dd 100644
--- a/packages/sealed_languages/lib/src/model/language/submodels/natural_language.dart
+++ b/packages/sealed_languages/lib/src/model/language/submodels/natural_language.dart
@@ -167,6 +167,7 @@ class NaturalLanguage extends Language
   factory NaturalLanguage.fromName(
     Object name, [
     Iterable<NaturalLanguage> languages = list,
+    // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   ]) {
     final upperCaseName = name.toUpperCaseIsoCode();
 
diff --git a/packages/sealed_languages/lib/src/model/language_family/submodels/natural_language_family.dart b/packages/sealed_languages/lib/src/model/language_family/submodels/natural_language_family.dart
index 50a5a93d..e7977be7 100644
--- a/packages/sealed_languages/lib/src/model/language_family/submodels/natural_language_family.dart
+++ b/packages/sealed_languages/lib/src/model/language_family/submodels/natural_language_family.dart
@@ -31,6 +31,7 @@ class NaturalLanguageFamily extends LanguageFamily {
   factory NaturalLanguageFamily.fromName(
     String name, [
     Iterable<NaturalLanguageFamily> families = list,
+    // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   ]) {
     assert(families.isNotEmpty, "`families` should not be empty!");
 
diff --git a/packages/sealed_languages/lib/src/model/script/submodels/script.dart b/packages/sealed_languages/lib/src/model/script/submodels/script.dart
index db0d7e29..9ea4b6b5 100644
--- a/packages/sealed_languages/lib/src/model/script/submodels/script.dart
+++ b/packages/sealed_languages/lib/src/model/script/submodels/script.dart
@@ -52,6 +52,7 @@ class Script extends WritingSystem
   /// {@macro optional_instances_array_parameter}
   /// This method returns the [Script] instance that corresponds to the
   /// given code, or throws a [StateError] if no such instance exists.
+  // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   factory Script.fromCode(Object code, [Iterable<Script>? scripts]) {
     if (scripts == null) return codeMap.findByCodeOrThrow(code);
     String? validCode =
@@ -101,6 +102,7 @@ class Script extends WritingSystem
   /// be used to specify a list of [Script] objects to search through. This
   /// method returns the [Script] instance that corresponds to the given name,
   /// or throws a [StateError] if no such instance exists.
+  // ignore: avoid-non-empty-constructor-bodies, more clear for factory methods.
   factory Script.fromName(Object name, [Iterable<Script> scripts = list]) {
     final upperCaseName = name.toUpperCaseIsoCode();
 
diff --git a/packages/world_countries/example/lib/routing/delegate.dart b/packages/world_countries/example/lib/routing/delegate.dart
index 3be875dc..a063025e 100644
--- a/packages/world_countries/example/lib/routing/delegate.dart
+++ b/packages/world_countries/example/lib/routing/delegate.dart
@@ -20,6 +20,7 @@ class SimpleRouterDelegate extends RouterDelegate<ParsedRoute>
     required this.routeState,
     required this.builder,
     required this.navigatorKey,
+    // ignore: avoid-non-empty-constructor-bodies, it's original Google code.
   }) {
     routeState.addListener(notifyListeners);
   }
diff --git a/packages/world_countries/example/lib/theme/theme_manager.dart b/packages/world_countries/example/lib/theme/theme_manager.dart
index b9a99d2b..4be45ab5 100644
--- a/packages/world_countries/example/lib/theme/theme_manager.dart
+++ b/packages/world_countries/example/lib/theme/theme_manager.dart
@@ -17,7 +17,6 @@ class _ThemeManagerState extends State<ThemeManager> {
   @override
   Widget build(BuildContext context) => ThemeProvider(
         _colors,
-        // ignore: prefer-correct-handler-name, it's not a handler.
         onColorsChange: (colors) => setState(() => _colors = colors),
         child: widget.child,
       );
diff --git a/packages/world_countries/example/lib/theme/theme_provider.dart b/packages/world_countries/example/lib/theme/theme_provider.dart
index db9ec9a8..447d298e 100644
--- a/packages/world_countries/example/lib/theme/theme_provider.dart
+++ b/packages/world_countries/example/lib/theme/theme_provider.dart
@@ -22,7 +22,8 @@ class ThemeProvider<T extends List<Color>> extends InheritedWidget {
       !listEquals(_flagColors, oldWidget._flagColors);
 
   ThemeData get theme {
-    final seedColor = _flagColors.firstOrNull?.withOpacity(1) ?? _whiteColor;
+    final seedColor =
+        _flagColors.firstOrNull?.withValues(alpha: 1) ?? _whiteColor;
     final brightness = ThemeData.estimateBrightnessForColor(seedColor);
 
     return ThemeData(
diff --git a/packages/world_countries/example/lib/widgets/description_tile.dart b/packages/world_countries/example/lib/widgets/description_tile.dart
index fc4d509a..ae4002a4 100644
--- a/packages/world_countries/example/lib/widgets/description_tile.dart
+++ b/packages/world_countries/example/lib/widgets/description_tile.dart
@@ -46,7 +46,7 @@ class DescriptionTile extends StatelessWidget {
             Divider(
               height: 1,
               thickness: 1,
-              color: leadingColor.withOpacity(0.1),
+              color: leadingColor.withValues(alpha: 0.1),
             ),
             ListTile(
               leading: _leading,
diff --git a/packages/world_countries/example/lib/widgets/tab_body.dart b/packages/world_countries/example/lib/widgets/tab_body.dart
index 1e8d1ecd..67044b35 100644
--- a/packages/world_countries/example/lib/widgets/tab_body.dart
+++ b/packages/world_countries/example/lib/widgets/tab_body.dart
@@ -26,7 +26,8 @@ class TabBody extends StatelessWidget {
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
           ColoredBox(
-            color: context.theme.colorScheme.onSecondary.withOpacity(1 / 2),
+            color:
+                context.theme.colorScheme.onSecondary.withValues(alpha: 1 / 2),
             child: Stack(
               alignment: Alignment.topCenter,
               children: [
@@ -54,7 +55,8 @@ class TabBody extends StatelessWidget {
           Expanded(
             child: ClipRect(
               child: ColoredBox(
-                color: context.theme.colorScheme.surface.withOpacity(1 / 2),
+                color:
+                    context.theme.colorScheme.surface.withValues(alpha: 1 / 2),
                 child: FunctionalPlatform.maybeWhenConst(
                   orElse: BackdropFilter(
                     filter: ImageFilter.blur(
diff --git a/packages/world_countries/lib/src/extensions/typed_locale_extension.dart b/packages/world_countries/lib/src/extensions/typed_locale_extension.dart
index e69e8933..87ca84b6 100644
--- a/packages/world_countries/lib/src/extensions/typed_locale_extension.dart
+++ b/packages/world_countries/lib/src/extensions/typed_locale_extension.dart
@@ -91,9 +91,9 @@ extension TypedLocaleExtension<O extends Object, T extends TypedLocale<O>>
       ) as T;
 
   ({
-    Iterable<NaturalLanguage> languages,
-    Iterable<FiatCurrency> currencies,
     Iterable<WorldCountry> countries,
+    Iterable<FiatCurrency> currencies,
+    Iterable<NaturalLanguage> languages,
   }) _itemsToTranslate(
     Iterable<NaturalLanguage>? languages,
     Iterable<FiatCurrency>? currencies,
diff --git a/packages/world_countries/lib/src/interfaces/indexed_list_view_interface.dart b/packages/world_countries/lib/src/interfaces/indexed_list_view_interface.dart
index 048667b0..7be584fb 100644
--- a/packages/world_countries/lib/src/interfaces/indexed_list_view_interface.dart
+++ b/packages/world_countries/lib/src/interfaces/indexed_list_view_interface.dart
@@ -1,7 +1,6 @@
 import "package:flutter/gestures.dart" show DragStartBehavior;
 import "package:flutter/widgets.dart";
 
-/// {@hideConstantImplementations}
 /// An interface for widgets that are displaying an indexed list of items.
 ///
 /// This widget can be used to display a list of items, each of which can be
diff --git a/packages/world_countries/lib/src/widgets/country/country_picker.dart b/packages/world_countries/lib/src/widgets/country/country_picker.dart
index 2bc6162d..eafafb67 100644
--- a/packages/world_countries/lib/src/widgets/country/country_picker.dart
+++ b/packages/world_countries/lib/src/widgets/country/country_picker.dart
@@ -114,7 +114,7 @@ class CountryPicker extends BasicPicker<WorldCountry> {
     final maybeNameTitle =
         itemNameTranslated(itemProperties.item, itemProperties.context);
 
-    return isDense ?? false
+    return (isDense ?? false)
         ? CountryTile.simple(
             itemProperties,
             title: maybeNameTitle,
diff --git a/packages/world_countries/lib/src/widgets/currency/currency_picker.dart b/packages/world_countries/lib/src/widgets/currency/currency_picker.dart
index 74376696..0b7a36d2 100644
--- a/packages/world_countries/lib/src/widgets/currency/currency_picker.dart
+++ b/packages/world_countries/lib/src/widgets/currency/currency_picker.dart
@@ -71,10 +71,10 @@ class CurrencyPicker extends BasicPicker<FiatCurrency> {
         itemProperties,
         title: itemNameTranslated(itemProperties.item, itemProperties.context),
         dense: isDense,
-        onPressed: (currency) => isDense ?? false
+        onPressed: (currency) => (isDense ?? false)
             ? maybeSelectAndPop(currency, itemProperties.context)
             : onSelect?.call(currency),
-        visualDensity: isDense ?? false ? VisualDensity.compact : null,
+        visualDensity: (isDense ?? false) ? VisualDensity.compact : null,
       );
 
   @override
diff --git a/packages/world_countries/lib/src/widgets/language/language_picker.dart b/packages/world_countries/lib/src/widgets/language/language_picker.dart
index f2be4a0f..32d6c597 100644
--- a/packages/world_countries/lib/src/widgets/language/language_picker.dart
+++ b/packages/world_countries/lib/src/widgets/language/language_picker.dart
@@ -71,10 +71,10 @@ class LanguagePicker extends BasicPicker<NaturalLanguage> {
         itemProperties,
         title: itemNameTranslated(itemProperties.item, itemProperties.context),
         dense: isDense,
-        onPressed: (language) => isDense ?? false
+        onPressed: (language) => (isDense ?? false)
             ? maybeSelectAndPop(language, itemProperties.context)
             : onSelect?.call(language),
-        visualDensity: isDense ?? false ? VisualDensity.compact : null,
+        visualDensity: (isDense ?? false) ? VisualDensity.compact : null,
       );
 
   @override
diff --git a/packages/world_countries/lib/src/widgets/phone_code/phone_code_picker.dart b/packages/world_countries/lib/src/widgets/phone_code/phone_code_picker.dart
index e1d9f54a..7c0d917a 100644
--- a/packages/world_countries/lib/src/widgets/phone_code/phone_code_picker.dart
+++ b/packages/world_countries/lib/src/widgets/phone_code/phone_code_picker.dart
@@ -151,10 +151,10 @@ class PhoneCodePicker extends CountryPicker {
           ),
         ),
         title: itemNameTranslated(itemProperties.item, itemProperties.context),
-        onPressed: (phone) => isDense ?? false
+        onPressed: (phone) => (isDense ?? false)
             ? maybeSelectAndPop(phone, itemProperties.context)
             : onSelect?.call(phone),
-        visualDensity: isDense ?? false ? VisualDensity.compact : null,
+        visualDensity: (isDense ?? false) ? VisualDensity.compact : null,
       );
 
   @override
diff --git a/packages/world_countries/lib/src/widgets/pickers/basic_picker.dart b/packages/world_countries/lib/src/widgets/pickers/basic_picker.dart
index d7c045bc..06fe18bb 100644
--- a/packages/world_countries/lib/src/widgets/pickers/basic_picker.dart
+++ b/packages/world_countries/lib/src/widgets/pickers/basic_picker.dart
@@ -269,7 +269,7 @@ abstract class BasicPicker<T extends Translated>
     ThemeData? appBarThemeData,
   }) async {
     T? result;
-    // ignore: avoid-late-keyword, we need it in the local function below.
+    // ignore: avoid-late-keyword, avoid-unnecessary-local-late, it's not.
     late final ImplicitSearchDelegate<T> delegate;
     // ignore: avoid-local-functions, lazy delegate.
     void closeOnSelect(T selected) {
diff --git a/packages/world_countries/lib/src/widgets/pickers/basic_picker_state.dart b/packages/world_countries/lib/src/widgets/pickers/basic_picker_state.dart
index 903686b9..43f134f4 100644
--- a/packages/world_countries/lib/src/widgets/pickers/basic_picker_state.dart
+++ b/packages/world_countries/lib/src/widgets/pickers/basic_picker_state.dart
@@ -43,8 +43,8 @@ class _BasicPickerState<T extends Translated> extends State<BasicPicker<T>> {
           theme?.dragStartBehavior ??
           DragStartBehavior.start,
       emptyStatePlaceholder: widget.emptyStatePlaceholder,
-      header: widget.showHeader ?? theme?.showHeader ?? true
-          ? widget.header ??
+      header: (widget.showHeader ?? theme?.showHeader ?? true)
+          ? (widget.header ??
               theme?.header ??
               AdaptiveSearchTextField(
                 _controller,
@@ -54,7 +54,7 @@ class _BasicPickerState<T extends Translated> extends State<BasicPicker<T>> {
                     UiConstants.padding,
                 showClearButton:
                     widget.showClearButton ?? theme?.showClearButton ?? true,
-              )
+              ))
           : null,
       itemBuilder: (itemProperties, {isDense}) =>
           widget.itemBuilder?.call(itemProperties, isDense: isDense) ??
diff --git a/packages/world_flags/lib/src/model/typedefs.dart b/packages/world_flags/lib/src/model/typedefs.dart
index f651e47c..3ea03d44 100644
--- a/packages/world_flags/lib/src/model/typedefs.dart
+++ b/packages/world_flags/lib/src/model/typedefs.dart
@@ -38,12 +38,12 @@ typedef FlagWidgetBuilder<T extends Widget> = T? Function(
 /// element.
 ///
 /// The record contains the following fields:
-/// - [canvas]: The [Canvas] on which the flag element is drawn.
-/// - [bounds]: The [Rect] that defines the bounds of the flag element.
-/// - [child]: An optional [ElementsProperties] that defines the properties of
+/// - `canvas`: The [Canvas] on which the flag element is drawn.
+/// - `bounds`: The [Rect] that defines the bounds of the flag element.
+/// - `child`: An optional [ElementsProperties] that defines the properties of
 ///   the child element.
 typedef FlagParentBounds = ({
-  Canvas canvas,
   Rect bounds,
+  Canvas canvas,
   ElementsProperties? child,
 });
diff --git a/packages/world_flags/lib/src/ui/country_flag.dart b/packages/world_flags/lib/src/ui/country_flag.dart
index 9f14f9bc..0b48160d 100644
--- a/packages/world_flags/lib/src/ui/country_flag.dart
+++ b/packages/world_flags/lib/src/ui/country_flag.dart
@@ -59,7 +59,7 @@ class CountryFlag extends StatelessWidget implements DecoratedFlagInterface {
   /// Creates a [CountryFlag] widget with a custom flag representation.
   ///
   /// - [country]: The country for which the flag is to be displayed.
-  /// - [map]: A map of custom flags.
+  /// - [alternativeMap]: A map of custom flags.
   /// - [height]: The height of the flag. If null, the height from the flag
   /// theme is used.
   /// - [width]: The width of the flag. If null, the width from the flag theme
diff --git a/packages/world_flags/lib/src/ui/flags/basic_flag.dart b/packages/world_flags/lib/src/ui/flags/basic_flag.dart
index 06b08068..60874cbf 100644
--- a/packages/world_flags/lib/src/ui/flags/basic_flag.dart
+++ b/packages/world_flags/lib/src/ui/flags/basic_flag.dart
@@ -79,7 +79,7 @@ class BasicFlag extends StatelessWidget implements DecoratedFlagInterface {
       elementsBuilder?.call(_elements, _flagAspectRatio);
 
   double _boxRatio(BoxDecoration? boxDecoration, double? ratio) =>
-      boxDecoration.isCircle ? 1 : ratio ?? _flagAspectRatio;
+      boxDecoration.isCircle ? 1 : (ratio ?? _flagAspectRatio);
 
   @override
   Widget build(BuildContext context) {
diff --git a/packages/world_flags/lib/src/ui/painters/custom/taegukgi_painter.dart b/packages/world_flags/lib/src/ui/painters/custom/taegukgi_painter.dart
index a0306e5e..cea7d3d4 100644
--- a/packages/world_flags/lib/src/ui/painters/custom/taegukgi_painter.dart
+++ b/packages/world_flags/lib/src/ui/painters/custom/taegukgi_painter.dart
@@ -117,6 +117,7 @@ final class TaegukgiPainter extends CustomElementsPainter {
       ..translate(offset.dx, offset.dy)
       ..rotate(angle);
 
+    // ignore: prefer-for-in, need index here.
     for (int i = 0; i < brokenBars.length; i += 1) {
       final isBroken = brokenBars.length > i && brokenBars[i];
       final y = (height + space) * i;
diff --git a/tools/lib/utils/args_parser.dart b/tools/lib/utils/args_parser.dart
index 14c6b633..dfe1172f 100644
--- a/tools/lib/utils/args_parser.dart
+++ b/tools/lib/utils/args_parser.dart
@@ -11,9 +11,8 @@ final class ArgsParser {
   Package? maybePackageName() {
     final parser = ArgParser();
     for (final package in Package.values) parser.addCommand(package.dirName);
-    final command = parser.parse(args).command?.name?.toCamelCase();
+    final command = parser.parse(args).command?.name?.toCamelCase() ?? "";
 
-    // ignore: avoid-non-null-assertion, null-checked during [isEmpty] check.
-    return command?.isEmpty ?? true ? null : Package.values.byName(command!);
+    return command.isEmpty ? null : Package.values.byName(command);
   }
 }
diff --git a/tools/lib/utils/json_utils.dart b/tools/lib/utils/json_utils.dart
index e5d108b7..f4f592f4 100644
--- a/tools/lib/utils/json_utils.dart
+++ b/tools/lib/utils/json_utils.dart
@@ -264,7 +264,7 @@ const ${varFileName.toCamelCase()} = [
     return language;
   }
 
-  ({String languageCode, String? countryCode, String? scriptCode})
+  ({String? countryCode, String languageCode, String? scriptCode})
       _extractLocaleCode(String code) {
     final regex = RegExp("^([A-Z]+)(?:_([A-Z]+))?(?:_([A-Z]+))?");
 
@@ -275,7 +275,7 @@ const ${varFileName.toCamelCase()} = [
     String? countryCode = match?.group(3);
     String? scriptCode = countryCode == null ? null : country;
     countryCode = scriptCode == null ? country : countryCode;
-    countryCode = countryCode?.isEmpty ?? true ? null : countryCode;
+    countryCode = (countryCode?.isEmpty ?? true) ? null : countryCode;
     if (countryCode?.length == 4) {
       scriptCode = countryCode;
       countryCode = null;