Remove return types on overridden getters so they can be inferred

The fewer explicit types we have, the fewer need to be updated
during the transition to null safety

Done via replacement of `(@OverRide\n  )([^(=\n]+ )(get [^(=\n]+=)` with `$1/$3`

Author: greglittlefield-wf

example/test/error_boundary_test.dart

@@ -42,7 +42,7 @@ final _ErrorBoundary = react.registerComponent2(() => _ErrorBoundaryComponent(),
 
 class _ErrorBoundaryComponent extends react.Component2 {
   @override
-  Map get initialState => {'hasError': false};
+  get initialState => {'hasError': false};
 
   @override
   getDerivedStateFromError(dynamic error) => {'hasError': true};
@@ -62,7 +62,7 @@ final _ThrowingComponent = react.registerComponent2(() => _ThrowingComponentComp
 
 class _ThrowingComponentComponent2 extends react.Component2 {
   @override
-  Map get initialState => {'shouldThrow': false};
+  get initialState => {'shouldThrow': false};
 
   @override
   render() {

example/test/react_test_components.dart

@@ -201,7 +201,7 @@ var mainComponent = react.registerComponent(() => _MainComponent());
 /////
 class _LegacyContextComponent extends react.Component {
   @override
-  Iterable<String> get childContextKeys => const ['foo', 'bar', 'renderCount'];
+  get childContextKeys => const ['foo', 'bar', 'renderCount'];
 
   @override
   getChildContext() => {
@@ -234,7 +234,7 @@ var legacyContextComponent = react.registerComponent(() => _LegacyContextCompone
 
 class _LegacyContextConsumerComponent extends react.Component {
   @override
-  Iterable<String> get contextKeys => const ['foo'];
+  get contextKeys => const ['foo'];
 
   @override
   render() {
@@ -254,7 +254,7 @@ var legacyContextConsumerComponent = react.registerComponent(() => _LegacyContex
 
 class _GrandchildLegacyContextConsumerComponent extends react.Component {
   @override
-  Iterable<String> get contextKeys => const ['renderCount'];
+  get contextKeys => const ['renderCount'];
 
   @override
   render() {

test/js_builds/shared_tests.dart

@@ -195,7 +195,7 @@ final _ErrorBoundary = react.registerComponent2(() => _ErrorBoundaryComponent(),
 
 class _ErrorBoundaryComponent extends react.Component2 {
   @override
-  Map get initialState => {'hasError': false};
+  get initialState => {'hasError': false};
 
   @override
   getDerivedStateFromError(dynamic error) => {'hasError': true};
@@ -215,7 +215,7 @@ final _ThrowingComponent = react.registerComponent(() => _ThrowingComponentCompo
 
 class _ThrowingComponentComponent extends react.Component {
   @override
-  String get displayName => r'DisplayName$_ThrowingComponentComponent';
+  get displayName => r'DisplayName$_ThrowingComponentComponent';
 
   @override
   render() {
@@ -227,7 +227,7 @@ final _ThrowingComponent2 = react.registerComponent2(() => _ThrowingComponent2Co
 
 class _ThrowingComponent2Component extends react.Component2 {
   @override
-  String get displayName => r'DisplayName$_ThrowingComponent2Component';
+  get displayName => r'DisplayName$_ThrowingComponent2Component';
 
   @override
   render() {

test/lifecycle_test/component.dart

@@ -87,7 +87,7 @@ class _DefaultPropsCachingTest extends react.Component implements DefaultPropsCa
   static int getDefaultPropsCallCount = 0;
 
   @override
-  int get staticGetDefaultPropsCallCount => getDefaultPropsCallCount;
+  get staticGetDefaultPropsCallCount => getDefaultPropsCallCount;
 
   @override
   set staticGetDefaultPropsCallCount(int value) => getDefaultPropsCallCount = value;
@@ -123,7 +123,7 @@ final ContextWrapperWithoutKeys =
 
 class _ContextWrapperWithoutKeys extends react.Component with LifecycleTestHelper {
   @override
-  Iterable<String> get childContextKeys => const [];
+  get childContextKeys => const [];
 
   @override
   getChildContext() {
@@ -142,7 +142,7 @@ final ContextWrapper = react.registerComponent(() => _ContextWrapper()) as React
 
 class _ContextWrapper extends react.Component with LifecycleTestHelper {
   @override
-  Iterable<String> get childContextKeys => const ['foo', 'extraContext'];
+  get childContextKeys => const ['foo', 'extraContext'];
 
   @override
   getChildContext() {
@@ -162,7 +162,7 @@ final LifecycleTestWithContext =
 
 class _LifecycleTestWithContext extends _LifecycleTest {
   @override
-  Iterable<String> get contextKeys => const ['foo']; // only listening to one context key
+  get contextKeys => const ['foo']; // only listening to one context key
 }
 
 final LifecycleTest = react.registerComponent(() => _LifecycleTest()) as ReactDartComponentFactoryProxy;

test/lifecycle_test/component2.dart

@@ -126,7 +126,7 @@ class _DefaultPropsCachingTest extends react.Component2 implements DefaultPropsC
   static int getDefaultPropsCallCount = 0;
 
   @override
-  int get staticGetDefaultPropsCallCount => getDefaultPropsCallCount;
+  get staticGetDefaultPropsCallCount => getDefaultPropsCallCount;
 
   @override
   set staticGetDefaultPropsCallCount(int value) => getDefaultPropsCallCount = value;
@@ -145,7 +145,7 @@ final DefaultPropsTest = react.registerComponent2(() => _DefaultPropsTest());
 
 class _DefaultPropsTest extends react.Component2 {
   @override
-  Map get defaultProps => {'defaultProp': 'default'};
+  get defaultProps => {'defaultProp': 'default'};
 
   @override
   render() => false;
@@ -263,10 +263,10 @@ class _LifecycleTest extends react.Component2 with LifecycleTestHelper {
   render() => lifecycleCall('render', defaultReturnValue: () => react.div({}));
 
   @override
-  Map get initialState => lifecycleCall('initialState', defaultReturnValue: () => {});
+  get initialState => lifecycleCall('initialState', defaultReturnValue: () => {});
 
   @override
-  Map get defaultProps => lifecycleCall('defaultProps', defaultReturnValue: () => {'defaultProp': 'default'});
+  get defaultProps => lifecycleCall('defaultProps', defaultReturnValue: () => {'defaultProp': 'default'});
 }
 
 final NoGetDerivedStateFromErrorLifecycleTest =
@@ -301,8 +301,8 @@ class _NoGetDerivedStateFromErrorLifecycleTest extends react.Component2 with Lif
   render() => lifecycleCall('render', defaultReturnValue: () => react.div({}));
 
   @override
-  Map get initialState => lifecycleCall('initialState', defaultReturnValue: () => {});
+  get initialState => lifecycleCall('initialState', defaultReturnValue: () => {});
 
   @override
-  Map get defaultProps => lifecycleCall('defaultProps', defaultReturnValue: () => {'defaultProp': 'default'});
+  get defaultProps => lifecycleCall('defaultProps', defaultReturnValue: () => {'defaultProp': 'default'});
 }