make String => string

com.unity.uiwidgets/Runtime/animation/curves.cs

                 start: 0.0f, end: 1.0f, tolerance: 1e-12f).ToList();
         }
         
-        static readonly List<String> _debugAssertReasons = new List<String>();
+        static readonly List<string> _debugAssertReasons = new List<string>();
 
         readonly List<Curve2DSample> _precomputedSamples;
 

com.unity.uiwidgets/Runtime/async2/zone.cs

             return handler(implementation.zone, parentDelegate, this, duration, f);
         }
 
-        public override void print(String line) {
+        public override void print(string line) {
             var implementation = _print;
             ZoneDelegate parentDelegate = async_._parentDelegate(implementation.zone);
             PrintHandler handler = implementation.function;

com.unity.uiwidgets/Runtime/cupertino/date_picker.cs

             numberLabelHeight = textPainter.height;
             numberLabelBaseline = textPainter.computeDistanceToActualBaseline(TextBaseline.alphabetic);
         }
-        Widget _buildLabel(String text, EdgeInsetsDirectional pickerPadding) {
+        Widget _buildLabel(string text, EdgeInsetsDirectional pickerPadding) {
             EdgeInsetsDirectional padding = EdgeInsetsDirectional.only(
                 start: numberLabelWidth
                        + CupertinoDatePickerUtils._kTimerPickerLabelPadSize

com.unity.uiwidgets/Runtime/foundation/assertions.cs

     
     internal abstract class _ErrorDiagnostic : DiagnosticsProperty<List<object>> {
         internal _ErrorDiagnostic(
-            String message,
+            string message,
             DiagnosticsTreeStyle style = DiagnosticsTreeStyle.flat,
             DiagnosticLevel level = DiagnosticLevel.info
         ) : base(

com.unity.uiwidgets/Runtime/material/bottom_sheet.cs

     class _ModalBottomSheetState<T> : State<_ModalBottomSheet<T>> {
         ParametricCurve<float> animationCurve = material_._modalBottomSheetCurve;
 
-        String _getRouteLabel(MaterialLocalizations localizations) {
+        string _getRouteLabel(MaterialLocalizations localizations) {
             switch (Theme.of(context).platform) {
                 case RuntimePlatform.IPhonePlayer:
                 case RuntimePlatform.OSXEditor:
             D.assert(material_.debugCheckHasMaterialLocalizations(context));
             MediaQueryData mediaQuery = MediaQuery.of(context);
             MaterialLocalizations localizations = MaterialLocalizations.of(context);
-            String routeLabel = _getRouteLabel(localizations);
+            string routeLabel = _getRouteLabel(localizations);
 
             return new AnimatedBuilder(
                 animation: widget.route.animation,

com.unity.uiwidgets/Runtime/material/pickers/date_picker_dialog.cs

         public static readonly Size _inputLandscapeDialogSize = new Size(496f, 160.0f);
         public static readonly TimeSpan _dialogSizeAnimationDuration = new TimeSpan(0, 0, 0, 0, 200);
 
-        public Future<DateTime> showDatePicker(
+        public static Future<DateTime> showDatePicker(
             BuildContext context,
             DateTime initialDate,
             DateTime firstDate,

com.unity.uiwidgets/Runtime/material/selectable_text.cs

 
   public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
       base.debugFillProperties(properties);
-      properties.add( new DiagnosticsProperty<String>("data", data, defaultValue: null));
+      properties.add( new DiagnosticsProperty<string>("data", data, defaultValue: null));
       properties.add( new DiagnosticsProperty<FocusNode>("focusNode", focusNode, defaultValue: null));
       properties.add( new DiagnosticsProperty<TextStyle>("style", style, defaultValue: null));
       properties.add( new DiagnosticsProperty<bool>("autofocus", autofocus, defaultValue: false));

com.unity.uiwidgets/Runtime/painting/alignment.cs

         }
 
 
-        internal static String _stringify(float x, float y) {
+        internal static string _stringify(float x, float y) {
             if (x == -1.0f && y == -1.0f)
                 return "topLeft";
             if (x == 0.0f && y == -1.0f)
             return null;
         }
 
-        internal static String _stringify(double start, double y) {
+        internal static string _stringify(double start, double y) {
             if (start == -1.0f && y == -1.0f)
                 return "AlignmentDirectional.topStart";
             if (start == 0.0f && y == -1.0f)

com.unity.uiwidgets/Runtime/painting/border_radius.cs

         public abstract BorderRadius resolve(TextDirection? textDirection);
 
         public override string ToString() {
-            String visual = null, logical = null;
+            string visual = null, logical = null;
             if (_topLeft == _topRight &&
                 _topRight == _bottomLeft &&
                 _bottomLeft == _bottomRight) {

com.unity.uiwidgets/Runtime/painting/box_border.cs

 
 
         public override string ToString() {
-            List<String> arguments = new List<string>();
+            List<string> arguments = new List<string>();
             if
                 (top != BorderSide.none) {
                 arguments.Add("top: $top");

com.unity.uiwidgets/Runtime/painting/text_style.cs

             int? maxLines = null,
             TextHeightBehavior textHeightBehavior = null,
             Locale locale = null,
-            String fontFamily = null,
+            string fontFamily = null,
             float? fontSize = null,
             FontWeight fontWeight = null,
             FontStyle? fontStyle = null,
             TextAlign? textAlign = null,
             TextDirection? textDirection = null,
             float textScaleFactor = 1.0f,
-            String ellipsis = null,
+            string ellipsis = null,
-            String fontFamily = null,
+            string fontFamily = null,
             float? fontSize = null,
             FontWeight fontWeight = null,
             FontStyle? fontStyle = null,

com.unity.uiwidgets/Runtime/rendering/flex.cs

         
         
         public override string toStringShort() {
-            String header = base.toStringShort();
+            string header = base.toStringShort();
             if (_overflow is float && _hasOverflow)
                 header += " OVERFLOWING";
             return header;

com.unity.uiwidgets/Runtime/services/asset_bundle.cs

             });
         }
 
-        public abstract Future<T> loadStructuredData<T>(String key, Func<string, Future<T>> parser);
+        public abstract Future<T> loadStructuredData<T>(string key, Func<string, Future<T>> parser);
-        public virtual void evict(String key) {
+        public virtual void evict(string key) {
         }
 
         public override string ToString() => $"{foundation_.describeIdentity(this)}()";
             return base.loadString(key);
         }
 
-        public override Future<T> loadStructuredData<T>(String key, Func<string, Future<T>> parser) {
+        public override Future<T> loadStructuredData<T>(string key, Func<string, Future<T>> parser) {
             D.assert(key != null);
             D.assert(parser != null);
             if (_structuredDataCache.ContainsKey(key))

com.unity.uiwidgets/Runtime/ui2/compositing.cs

             return true;
         }
 
-        bool _debugCheckCanBeUsedAsOldLayer(_EngineLayerWrapper layer, String methodName) {
+        bool _debugCheckCanBeUsedAsOldLayer(_EngineLayerWrapper layer, string methodName) {
             D.assert(() => {
                 if (layer == null) {
                     return true;

com.unity.uiwidgets/Runtime/ui2/window.cs

         public bool highContrast => (_kHighContrastIndex & _index) != 0;
 
         public override string ToString() {
-            List<String> features = new List<String>();
+            List<string> features = new List<string>();
             if (accessibleNavigation)
                 features.Add("accessibleNavigation");
             if (invertColors)

com.unity.uiwidgets/Runtime/widgets/focus_manager.cs

             properties.add(new DiagnosticsProperty<FocusNode>("nextFocus", _markedForFocus, defaultValue: null));
             Element element = primaryFocus?.context as Element;
             if (element != null) {
-              properties.add(new DiagnosticsProperty<String>("primaryFocusCreator", element.debugGetCreatorChain(20)));
+              properties.add(new DiagnosticsProperty<string>("primaryFocusCreator", element.debugGetCreatorChain(20)));
             }
         }
     }

com.unity.uiwidgets/Runtime/widgets/framework.cs

 
         void visitChildElements(ElementVisitor visitor);
 
-        DiagnosticsNode describeElement(String name, DiagnosticsTreeStyle style = DiagnosticsTreeStyle.errorProperty);
+        DiagnosticsNode describeElement(string name, DiagnosticsTreeStyle style = DiagnosticsTreeStyle.errorProperty);
-        DiagnosticsNode describeWidget(String name, DiagnosticsTreeStyle style = DiagnosticsTreeStyle.errorProperty);
+        DiagnosticsNode describeWidget(string name, DiagnosticsTreeStyle style = DiagnosticsTreeStyle.errorProperty);
-        DiagnosticsNode describeOwnershipChain(String name);
+        DiagnosticsNode describeOwnershipChain(string name);
     }
 
     public class BuildOwner {
             return information;
         }
 
-        public static DiagnosticsNode describeElements(String name, IEnumerable<Element> elements) {
+        public static DiagnosticsNode describeElements(string name, IEnumerable<Element> elements) {
             return new DiagnosticsBlock(
                 name: name,
                 children: elements.Select((Element element) => new DiagnosticsProperty<Element>("", element))
             return new DiagnosticsProperty<Element>(name, this, style: style);
         }
 
-        public DiagnosticsNode describeWidget(String name,
+        public DiagnosticsNode describeWidget(string name,
-        public DiagnosticsNode describeOwnershipChain(String name) {
+        public DiagnosticsNode describeOwnershipChain(string name) {
             return new StringProperty(name, debugGetCreatorChain(10));
         }
 

com.unity.uiwidgets/Runtime/widgets/title.cs

             this.title = title;
         }
 
-        public readonly String title;
+        public readonly string title;
         public readonly Color color;
         public readonly Widget child;
         public override Widget build(BuildContext context) {