Add some new lint rules (#1117)

examples/lib/stories/collision_detection/multiple_shapes.dart

@@ -246,10 +246,10 @@ class SnowmanPart extends HitboxCircle {
   SnowmanPart(double definition, Vector2 relativeOffset, Color hitColor)
       : super(normalizedRadius: definition) {
     this.relativeOffset.setFrom(relativeOffset);
-    hitPaint..color = startColor;
+    hitPaint.color = startColor;
     onCollision = (Set<Vector2> intersectionPoints, HitboxShape other) {
       if (other.component is ScreenCollidable) {
-        hitPaint..color = startColor;
+        hitPaint.color = startColor;
       } else {
         hitPaint.color = hitColor.withOpacity(0.8);
       }

examples/lib/stories/effects/rotate_effect_example.dart

@@ -94,13 +94,11 @@ class Compass extends PositionComponent {
       final angle = Transform2D.tau * (i / 12);
       // Note: rim takes up 0.1radius, so the lengths must be > than that
       final markLength = (i % 3 == 0) ? _radius * 0.2 : _radius * 0.15;
-      _marksPath
-        ..moveTo(
+      _marksPath.moveTo(
         _radius + _radius * sin(angle),
         _radius + _radius * cos(angle),
       );
-      _marksPath
-        ..lineTo(
+      _marksPath.lineTo(
         _radius + (_radius - markLength) * sin(angle),
         _radius + (_radius - markLength) * cos(angle),
       );

examples/lib/stories/system/system.dart

@@ -5,8 +5,7 @@ import '../../commons/commons.dart';
 import 'pause_resume_game.dart';
 
 void addSystemStories(Dashbook dashbook) {
-  dashbook.storiesOf('System')
-    ..add(
+  dashbook.storiesOf('System').add(
         'Pause/resume engine',
         (_) => GameWidget(game: PauseResumeGame()),
         codeLink: baseLink('system/pause_resume_game.dart'),

examples/lib/stories/tile_maps/tile_maps.dart

@@ -5,8 +5,7 @@ import '../../commons/commons.dart';
 import 'isometric_tile_map.dart';
 
 void addTileMapStories(Dashbook dashbook) {
-  dashbook.storiesOf('Tile Maps')
-    ..add(
+  dashbook.storiesOf('Tile Maps').add(
         'Isometric Tile Map',
         (_) => GameWidget(game: IsometricTileMapGame()),
         codeLink: baseLink('tile_maps/isometric_tile_map.dart'),

packages/flame/lib/src/components/input/joystick_component.dart

@@ -93,7 +93,7 @@ class JoystickComponent extends HudMarginComponent with Draggable {
   void update(double dt) {
     super.update(dt);
     final knobRadius2 = knobRadius * knobRadius;
-    delta..setFrom(_unscaledDelta);
+    delta.setFrom(_unscaledDelta);
     if (delta.isZero() && _baseKnobPosition != knob!.position) {
       knob!.position = _baseKnobPosition;
     } else if (delta.length2 > knobRadius2) {

packages/flame/lib/src/components/parallax_component.dart

@@ -67,8 +67,7 @@ class ParallaxComponent<T extends FlameGame> extends PositionComponent
     Anchor? anchor,
     int? priority,
   })  : _parallax = parallax,
-        isFullscreen =
-            size == null && !(parallax?.isSized ?? false) ? true : false,
+        isFullscreen = size == null && !(parallax?.isSized ?? false),
         super(
           position: position,
           size: size ?? ((parallax?.isSized ?? false) ? parallax?.size : null),

packages/flame/lib/src/effects2/standard_effect_controller.dart

@@ -44,11 +44,11 @@ class StandardEffectController extends EffectController {
     this.atMaxDuration = 0.0,
     this.atMinDuration = 0.0,
   })  : assert(
-          infinite ? repeatCount == null : true,
+          !infinite || repeatCount == null,
           'An infinite animation cannot have a repeat count',
         ),
         assert(
-          !infinite ? (repeatCount ?? 1) > 0 : true,
+          infinite || (repeatCount ?? 1) > 0,
           'repeatCount must be positive',
         ),
         assert(duration > 0, 'duration must be positive'),

packages/flame/lib/src/effects2/transform2d_effect.dart

@@ -31,7 +31,7 @@ abstract class Transform2DEffect extends Effect {
     if (parent is PositionComponent) {
       target = (parent! as PositionComponent).transform;
     }
-    // TODO: add Camera support once it uses Transform2D
+    // TODO(st-pasha): add Camera support once it uses Transform2D
     else {
       throw UnsupportedError(
         'Can only apply a Transform2DEffect to a PositionComponent class',

packages/flame/lib/src/particles/particle.dart

@@ -90,7 +90,7 @@ abstract class Particle {
   ///
   /// See `SingleChildParticle` or [ComposedParticle] for details.
   void setLifespan(double lifespan) {
-    // TODO: Maybe make it into a setter/getter?
+    // TODO(wolfenrain): Maybe make it into a setter/getter?
     _lifespan = lifespan;
     _timer?.stop();
     _timer = Timer(lifespan, onTick: () => _shouldBeRemoved = true)..start();

packages/flame/lib/src/sprite_batch.dart

@@ -264,7 +264,7 @@ class SpriteBatch {
 
     if (kIsWeb) {
       for (final batchItem in _batchItems) {
-        paint..blendMode = blendMode ?? paint.blendMode;
+        paint.blendMode = blendMode ?? paint.blendMode;
 
         canvas
           ..save()

packages/flame/test/components/hoverable_test.dart

@@ -200,7 +200,7 @@ void main() {
   });
 }
 
-// TODO(luan) we can probably provide some helpers to facilitate testing events
+// TODO(luan): we can probably provide some helpers to facilitate testing events
 void _triggerMouseMove(HasHoverables game, double dx, double dy) {
   game.onMouseMove(
     PointerHoverInfo.fromDetails(

packages/flame/test/game/camera_and_viewport_test.dart

@@ -31,7 +31,7 @@ void main() {
     });
 
     flameGame.test('fixed ratio viewport has perfect ratio', (game) {
-      game..camera.viewport = FixedResolutionViewport(Vector2.all(50));
+      game.camera.viewport = FixedResolutionViewport(Vector2.all(50));
       game.onGameResize(Vector2.all(200.0));
       expect(game.canvasSize, Vector2.all(200.00));
       expect(game.size, Vector2.all(50.00));
@@ -52,7 +52,7 @@ void main() {
     });
 
     flameGame.test('fixed ratio viewport maxes width', (game) {
-      game..camera.viewport = FixedResolutionViewport(Vector2.all(50));
+      game.camera.viewport = FixedResolutionViewport(Vector2.all(50));
       game.onGameResize(Vector2(100.0, 200.0));
       expect(game.canvasSize, Vector2(100.0, 200.00));
       expect(game.size, Vector2.all(50.00));
@@ -74,7 +74,7 @@ void main() {
     });
 
     flameGame.test('fixed ratio viewport maxes height', (game) {
-      game..camera.viewport = FixedResolutionViewport(Vector2(100.0, 400.0));
+      game.camera.viewport = FixedResolutionViewport(Vector2(100.0, 400.0));
       game.onGameResize(Vector2(100.0, 200.0));
       expect(game.canvasSize, Vector2(100.0, 200.00));
       expect(game.size, Vector2(100.00, 400.0));

packages/flame/test/game/projections_test.dart

@@ -198,7 +198,7 @@ void main() {
         game.projector.unprojectVector(Vector2.all(5)),
         Vector2.all(-100),
       );
-      // TODO(luan) we might want to change the behaviour so that the zoom
+      // TODO(luan): we might want to change the behaviour so that the zoom
       // is applied w.r.t. the relativeOffset and not topLeft
 
       // for deltas, we consider only the zoom

packages/flame_fire_atlas/example/lib/main.dart

@@ -6,14 +6,10 @@ import 'package:flame_fire_atlas/flame_fire_atlas.dart';
 import 'package:flutter/material.dart';
 
 void main() async {
-  try {
   WidgetsFlutterBinding.ensureInitialized();
 
   final game = ExampleGame();
   runApp(GameWidget(game: game));
-  } catch (e) {
-    print(e);
-  }
 }
 
 class ExampleGame extends FlameGame with TapDetector {

packages/flame_forge2d/lib/position_body_component.dart

@@ -27,7 +27,7 @@ abstract class PositionBodyComponent<T extends Forge2DGame>
   Future<void> onLoad() async {
     await super.onLoad();
     updatePositionComponent();
-    positionComponent..anchor = Anchor.center;
+    positionComponent.anchor = Anchor.center;
     gameRef.add(positionComponent);
   }
 
@@ -46,7 +46,7 @@ abstract class PositionBodyComponent<T extends Forge2DGame>
   }
 
   void updatePositionComponent() {
-    positionComponent.position..setFrom(body.position);
+    positionComponent.position.setFrom(body.position);
     positionComponent.position.y *= -1;
     positionComponent
       ..angle = -angle

packages/flame_lint/lib/analysis_options.yaml

@@ -1,5 +1,5 @@
 # Source of linter options:
-# http://dart-lang.github.io/linter/lints/options/options.html
+# https://dart-lang.github.io/linter/lints/options/options.html
 
 analyzer:
   strong-mode:
@@ -12,7 +12,9 @@ linter:
     - always_put_control_body_on_new_line
     - always_require_non_null_named_parameters
     - annotate_overrides
+    - avoid_bool_literals_in_conditional_expressions
     - avoid_double_and_int_checks
+    - avoid_catches_without_on_clauses
     - avoid_dynamic_calls
     - avoid_empty_else
     - avoid_equals_and_hash_code_on_mutable_classes
@@ -26,6 +28,7 @@ linter:
     - avoid_relative_lib_imports
     - avoid_return_types_on_setters
     - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
     - avoid_slow_async_io
     - avoid_type_to_string
     - avoid_types_as_parameter_names
@@ -47,6 +50,7 @@ linter:
     - empty_statements
     - exhaustive_cases
     - file_names
+    - flutter_style_todos
     - hash_and_equals
     - implementation_imports
     - invariant_booleans
@@ -91,7 +95,6 @@ linter:
     - prefer_is_not_empty
     - prefer_is_not_operator
     - prefer_iterable_whereType
-#    - prefer_mixin
     - prefer_null_aware_operators
     - prefer_single_quotes
     - prefer_spread_collections
@@ -114,7 +117,9 @@ linter:
     - unnecessary_lambdas
     - unnecessary_new
     - unnecessary_null_aware_assignments
+    - unnecessary_null_checks
     - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
     - unnecessary_overrides
     - unnecessary_parenthesis
     - unnecessary_raw_strings
@@ -128,4 +133,6 @@ linter:
     - use_function_type_syntax_for_parameters
     - use_is_even_rather_than_modulo
     - use_rethrow_when_possible
+    - use_test_throws_matchers
+    - valid_regexps
     - void_checks