Tmp store.

Runtime/widgets/selectable_text.cs

 
         public void didChangeTextScaleFactor() {
         }
+        
+        public void didChangePlatformBrightness() {
+        }
 
         public void didChangeLocales(List<Locale> locale) {
         }

Runtime/widgets/transitions.cs

     public class FadeTransition : SingleChildRenderObjectWidget {
         public FadeTransition(Key key = null, Animation<float> opacity = null,
             Widget child = null) : base(key: key, child: child) {
+            D.assert(opacity != null);
             this.opacity = opacity;
         }
 
             float? widthFactor = null,
             float? heightFactor = null
         ) : base(key: key, listenable: alignment) {
+            D.assert(alignment != null);
+            D.assert(child != null);
             this.child = child;
             this.widthFactor = widthFactor;
             this.heightFactor = heightFactor;
             Widget child = null) :
             base(key, animation) {
             D.assert(builder != null);
+            D.assert(animation != null);
             this.builder = builder;
             this.child = child;
         }

Runtime/widgets/widget_inspector.cs

         public void didChangeTextScaleFactor() {
         }
 
+        public void didChangePlatformBrightness() {
+        }
+
         public void didChangeLocales(List<Locale> locale) {
         }