Remove unnecessary null checks (#39113)

analysis_options.yaml

@@ -12,8 +12,6 @@ analyzer:
     # allow self-reference to deprecated members (we do this because otherwise we have
     # to annotate every member in every test, assert, etc, when we deprecate something)
     deprecated_member_use_from_same_package: ignore
-    # Turned off until null-safe rollout is complete.
-    unnecessary_null_comparison: ignore
   exclude: # DIFFERENT FROM FLUTTER/FLUTTER
     # Fixture depends on dart:ui and raises false positives.
     - flutter_frontend_server/test/fixtures/lib/main.dart

ci/licenses_golden/tool_signature

@@ -1,2 +1,2 @@
-Signature: 974dd21be7c0e97f436f3758b6de4cee
+Signature: ccf8317fb6539998c8f4ff0a96d7f698
 

lib/ui/compositing.dart

@@ -375,7 +375,6 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     Clip clipBehavior = Clip.antiAlias,
     ClipRectEngineLayer? oldLayer,
   }) {
-    assert(clipBehavior != null);
     assert(clipBehavior != Clip.none);
     assert(_debugCheckCanBeUsedAsOldLayer(oldLayer, 'pushClipRect'));
     final EngineLayer engineLayer = EngineLayer._();
@@ -411,7 +410,6 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     Clip clipBehavior = Clip.antiAlias,
     ClipRRectEngineLayer? oldLayer,
   }) {
-    assert(clipBehavior != null);
     assert(clipBehavior != Clip.none);
     assert(_debugCheckCanBeUsedAsOldLayer(oldLayer, 'pushClipRRect'));
     final EngineLayer engineLayer = EngineLayer._();
@@ -439,7 +437,6 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     Clip clipBehavior = Clip.antiAlias,
     ClipPathEngineLayer? oldLayer,
   }) {
-    assert(clipBehavior != null);
     assert(clipBehavior != Clip.none);
     assert(_debugCheckCanBeUsedAsOldLayer(oldLayer, 'pushClipPath'));
     final EngineLayer engineLayer = EngineLayer._();
@@ -494,10 +491,8 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     ColorFilter filter, {
     ColorFilterEngineLayer? oldLayer,
   }) {
-    assert(filter != null);
     assert(_debugCheckCanBeUsedAsOldLayer(oldLayer, 'pushColorFilter'));
     final _ColorFilter nativeFilter = filter._toNativeColorFilter()!;
-    assert(nativeFilter != null);
     final EngineLayer engineLayer = EngineLayer._();
     _pushColorFilter(engineLayer, nativeFilter, oldLayer?._nativeLayer);
     final ColorFilterEngineLayer layer = ColorFilterEngineLayer._(engineLayer);
@@ -523,10 +518,8 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     Offset offset = Offset.zero,
     ImageFilterEngineLayer? oldLayer,
   }) {
-    assert(filter != null);
     assert(_debugCheckCanBeUsedAsOldLayer(oldLayer, 'pushImageFilter'));
     final _ImageFilter nativeFilter = filter._toNativeImageFilter();
-    assert(nativeFilter != null);
     final EngineLayer engineLayer = EngineLayer._();
     _pushImageFilter(engineLayer, nativeFilter, offset.dx, offset.dy, oldLayer?._nativeLayer);
     final ImageFilterEngineLayer layer = ImageFilterEngineLayer._(engineLayer);
@@ -799,7 +792,6 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     bool freeze = false,
     FilterQuality filterQuality = FilterQuality.low,
   }) {
-    assert(offset != null, 'Offset argument was null');
     _addTexture(offset.dx, offset.dy, width, height, textureId, freeze, filterQuality.index);
   }
 
@@ -828,7 +820,6 @@ class SceneBuilder extends NativeFieldWrapperClass1 {
     double width = 0.0,
     double height = 0.0,
   }) {
-    assert(offset != null, 'Offset argument was null');
     _addPlatformView(offset.dx, offset.dy, width, height, viewId);
   }
 

lib/ui/experiments/scene.dart

@@ -80,9 +80,7 @@ class SceneNode extends NativeFieldWrapperClass1 {
       <String, WeakReference<SceneNodeValue>>{};
 
   static Future<void> _reinitializeScene(String assetKey) async {
-    final WeakReference<SceneNodeValue>? sceneRef = _ipsceneRegistry == null
-      ? null
-      : _ipsceneRegistry[assetKey];
+    final WeakReference<SceneNodeValue>? sceneRef = _ipsceneRegistry[assetKey];
 
     // If a scene for the asset isn't already registered, then there's no
     // need to reinitialize it.

lib/ui/geometry.dart

@@ -12,9 +12,7 @@ abstract class OffsetBase {
   ///
   /// The first argument sets the horizontal component, and the second the
   /// vertical component.
-  const OffsetBase(this._dx, this._dy)
-      : assert(_dx != null),
-        assert(_dy != null);
+  const OffsetBase(this._dx, this._dy);
 
   final double _dx;
   final double _dy;
@@ -314,7 +312,6 @@ class Offset extends OffsetBase {
   /// Values for `t` are usually obtained from an [Animation<double>], such as
   /// an [AnimationController].
   static Offset? lerp(Offset? a, Offset? b, double t) {
-    assert(t != null);
     if (b == null) {
       if (a == null) {
         return null;
@@ -590,7 +587,6 @@ class Size extends OffsetBase {
   /// Values for `t` are usually obtained from an [Animation<double>], such as
   /// an [AnimationController].
   static Size? lerp(Size? a, Size? b, double t) {
-    assert(t != null);
     if (b == null) {
       if (a == null) {
         return null;
@@ -637,11 +633,7 @@ class Rect {
   /// ![](https://flutter.github.io/assets-for-api-docs/assets/dart-ui/rect_from_ltrb.png#gh-light-mode-only)
   /// ![](https://flutter.github.io/assets-for-api-docs/assets/dart-ui/rect_from_ltrb_dark.png#gh-dark-mode-only)
   @pragma('vm:entry-point')
-  const Rect.fromLTRB(this.left, this.top, this.right, this.bottom)
-      : assert(left != null),
-        assert(top != null),
-        assert(right != null),
-        assert(bottom != null);
+  const Rect.fromLTRB(this.left, this.top, this.right, this.bottom);
 
   /// Construct a rectangle from its left and top edges, its width, and its
   /// height.
@@ -891,7 +883,6 @@ class Rect {
   /// Values for `t` are usually obtained from an [Animation<double>], such as
   /// an [AnimationController].
   static Rect? lerp(Rect? a, Rect? b, double t) {
-    assert(t != null);
     if (b == null) {
       if (a == null) {
         return null;
@@ -1059,7 +1050,6 @@ class Radius {
   /// Values for `t` are usually obtained from an [Animation<double>], such as
   /// an [AnimationController].
   static Radius? lerp(Radius? a, Radius? b, double t) {
-    assert(t != null);
     if (b == null) {
       if (a == null) {
         return null;
@@ -1268,19 +1258,7 @@ class RRect {
     this.brRadiusY = 0.0,
     this.blRadiusX = 0.0,
     this.blRadiusY = 0.0,
-  }) : assert(left != null),
-       assert(top != null),
-       assert(right != null),
-       assert(bottom != null),
-       assert(tlRadiusX != null),
-       assert(tlRadiusY != null),
-       assert(trRadiusX != null),
-       assert(trRadiusY != null),
-       assert(brRadiusX != null),
-       assert(brRadiusY != null),
-       assert(blRadiusX != null),
-       assert(blRadiusY != null),
-       assert(tlRadiusX >= 0),
+  }) : assert(tlRadiusX >= 0),
        assert(tlRadiusY >= 0),
        assert(trRadiusX >= 0),
        assert(trRadiusY >= 0),
@@ -1661,7 +1639,6 @@ class RRect {
   /// Values for `t` are usually obtained from an [Animation<double>], such as
   /// an [AnimationController].
   static RRect? lerp(RRect? a, RRect? b, double t) {
-    assert(t != null);
     if (b == null) {
       if (a == null) {
         return null;

lib/ui/hooks.dart

@@ -138,9 +138,6 @@ void _invoke(void Function()? callback, Zone zone) {
   if (callback == null) {
     return;
   }
-
-  assert(zone != null);
-
   if (identical(zone, Zone.current)) {
     callback();
   } else {
@@ -157,9 +154,6 @@ void _invoke1<A>(void Function(A a)? callback, Zone zone, A arg) {
   if (callback == null) {
     return;
   }
-
-  assert(zone != null);
-
   if (identical(zone, Zone.current)) {
     callback(arg);
   } else {
@@ -176,9 +170,6 @@ void _invoke2<A1, A2>(void Function(A1 a1, A2 a2)? callback, Zone zone, A1 arg1,
   if (callback == null) {
     return;
   }
-
-  assert(zone != null);
-
   if (identical(zone, Zone.current)) {
     callback(arg1, arg2);
   } else {
@@ -197,9 +188,6 @@ void _invoke3<A1, A2, A3>(void Function(A1 a1, A2 a2, A3 a3)? callback, Zone zon
   if (callback == null) {
     return;
   }
-
-  assert(zone != null);
-
   if (identical(zone, Zone.current)) {
     callback(arg1, arg2, arg3);
   } else {

lib/ui/isolate_name_server.dart

@@ -31,7 +31,6 @@ class IsolateNameServer {
   ///
   /// The `name` argument must not be null.
   static SendPort? lookupPortByName(String name) {
-    assert(name != null, "'name' cannot be null.");
     return _lookupPortByName(name);
   }
 
@@ -49,8 +48,6 @@ class IsolateNameServer {
   ///
   /// The `port` and `name` arguments must not be null.
   static bool registerPortWithName(SendPort port, String name) {
-    assert(port != null, "'port' cannot be null.");
-    assert(name != null, "'name' cannot be null.");
     return _registerPortWithName(port, name);
   }
 
@@ -66,7 +63,6 @@ class IsolateNameServer {
   ///
   /// The `name` argument must not be null.
   static bool removePortNameMapping(String name) {
-    assert(name != null, "'name' cannot be null.");
     return _removePortNameMapping(name);
   }