Create an enum for widget inspector service extensions for use by tools (#111405)

packages/flutter/lib/src/widgets/service_extensions.dart

@@ -94,3 +94,369 @@ enum WidgetsServiceExtensions {
   ///   registered.
   debugAllowBanner,
 }
+
+/// Service extension constants for the Widget Inspector.
+///
+/// These constants will be used when registering service extensions in the
+/// framework, and they will also be used by tools and services that call these
+/// service extensions.
+///
+/// The String value for each of these extension names should be accessed by
+/// calling the `.name` property on the enum value.
+enum WidgetInspectorServiceExtensions {
+  /// Name of service extension that, when called, will determine whether
+  /// [FlutterError] messages will be presented using a structured format.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  /// * [WidgetInspectorService._reportStructuredError], which is the error
+  ///   reporter that will be used when this service extension is enabled.
+  structuredErrors,
+
+  /// Name of service extension that, when called, will change the value of
+  /// [WidgetsApp.debugShowWidgetInspectorOverride], which controls whether the
+  /// on-device widget inspector is visible.
+  ///
+  /// See also:
+  /// * [WidgetsApp.debugShowWidgetInspectorOverride], which is the flag that
+  ///   this service extension exposes.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  show,
+
+  /// Name of service extension that, when called, changes the value of
+  /// [WidgetInspectorService._trackRebuildDirtyWidgets], which determines
+  /// whether a callback is invoked for every dirty [Widget] built each frame.
+  ///
+  /// This service extension is only supported if
+  /// [WidgetInspectorService._widgetCreationTracked] is true.
+  ///
+  /// See also:
+  ///
+  /// * [debugOnRebuildDirtyWidget], which is the nullable callback that is
+  ///   called for every dirty widget built per frame
+  /// * [WidgetInspectorService._onRebuildWidget], which is the callback we
+  ///   assign to [debugOnRebuildDirtyWidget] when this service extension is set
+  ///   to true.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  trackRebuildDirtyWidgets,
+
+  /// Name of service extension that, when called, changes the value of
+  /// [WidgetInspectorService._trackRepaintWidgets], which determines whether
+  /// a callback is invoked for every [RenderObject] painted each frame.
+  ///
+  /// This service extension is only supported if
+  /// [WidgetInspectorService._widgetCreationTracked] is true.
+  ///
+  /// See also:
+  ///
+  /// * [debugOnProfilePaint], which is the nullable callback that is called for
+  ///   every dirty widget built per frame
+  /// * [WidgetInspectorService._onPaint], which is the callback we
+  ///   assign to [debugOnRebuildDirtyWidget] when this service extension is set
+  ///   to true.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  trackRepaintWidgets,
+
+  /// Name of service extension that, when called, will clear all
+  /// [WidgetInspectorService] object references in all groups.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.disposeAllGroups], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  disposeAllGroups,
+
+  /// Name of service extension that, when called, will clear all
+  /// [WidgetInspectorService] object references in a group.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.disposeGroup], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  disposeGroup,
+
+  /// Name of service extension that, when called, returns whether it is
+  /// appropriate to display the Widget tree in the inspector, which is only
+  /// true after the application has rendered its first frame.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.isWidgetTreeReady], the method that this service
+  ///   extension calls.
+  /// * [WidgetsBinding.debugDidSendFirstFrameEvent], which stores the
+  ///   value of whether the first frame has been rendered.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  isWidgetTreeReady,
+
+  /// Name of service extension that, when called, will remove the object with
+  /// the specified `id` from the specified object group.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.disposeId], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  disposeId,
+
+  /// Name of service extension that, when called, will set the list of
+  /// directories that should be considered part of the local project for the
+  /// Widget inspector summary tree.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.addPubRootDirectories], which should be used in
+  ///   place of this method to add directories.
+  /// * [WidgetInspectorService.removePubRootDirectories], which should be used
+  ///   in place of this method to remove directories.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  @Deprecated(
+    'Use addPubRootDirectories instead. '
+    'This feature was deprecated after v3.1.0-9.0.pre.',
+  )
+  setPubRootDirectories,
+
+  /// Name of service extension that, when called, will add a list of
+  /// directories that should be considered part of the local project for the
+  /// Widget inspector summary tree.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.addPubRootDirectories], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.removePubRootDirectories], which should be used
+  ///   to remove directories.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  addPubRootDirectories,
+
+  /// Name of service extension that, when called, will remove a list of
+  /// directories that should no longer be considered part of the local project
+  /// for the Widget inspector summary tree.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.removePubRootDirectories], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.addPubRootDirectories], which should be used
+  ///   to add directories.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  removePubRootDirectories,
+
+  /// Name of service extension that, when called, will set the
+  /// [WidgetInspector] selection to the object matching the specified id and
+  /// will return whether the selection was changed.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.setSelectionById], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  setSelectionById,
+
+  /// Name of service extension that, when called, will retrieve the chain of
+  /// [DiagnosticsNode] instances form the root of the tree to the [Element] or
+  /// [RenderObject] matching the specified id, passed as an argument.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getParentChain], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.getParentChain], which returns a json encoded
+  ///   String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getParentChain,
+
+  /// Name of service extension that, when called, will return the properties
+  /// for the [DiagnosticsNode] object matching the specified id, passed as an
+  /// argument.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getProperties], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.getProperties], which returns a json encoded
+  ///   String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getProperties,
+
+  /// Name of service extension that, when called, will return the children
+  /// for the [DiagnosticsNode] object matching the specified id, passed as an
+  /// argument.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getChildren], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.getChildren], which returns a json encoded
+  ///   String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getChildren,
+
+  /// Name of service extension that, when called, will return the children
+  /// created by user code for the [DiagnosticsNode] object matching the
+  /// specified id, passed as an argument.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getChildrenSummaryTree], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.getChildrenSummaryTree], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getChildrenSummaryTree,
+
+  /// Name of service extension that, when called, will return all children and
+  /// their properties for the [DiagnosticsNode] object matching the specified
+  /// id, passed as an argument.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getChildrenDetailsSubtree], the method that
+  ///   this service extension calls.
+  /// * [WidgetInspectorService.getChildrenDetailsSubtree], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getChildrenDetailsSubtree,
+
+  /// Name of service extension that, when called, will return the
+  /// [DiagnosticsNode] data for the root [Element].
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getRootWidget], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.getRootWidget], which returns a json encoded
+  ///   String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getRootWidget,
+
+  /// Name of service extension that, when called, will return the
+  /// [DiagnosticsNode] data for the root [RenderObject].
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getRootRenderObject], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.getRootRenderObject], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getRootRenderObject,
+
+  /// Name of service extension that, when called, will return the
+  /// [DiagnosticsNode] data for the root [Element] of the summary tree, which
+  /// only includes [Element]s that were created by user code.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getRootWidgetSummaryTree], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.getRootWidgetSummaryTree], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getRootWidgetSummaryTree,
+
+  /// Name of service extension that, when called, will return the details
+  /// subtree, which includes properties, rooted at the [DiagnosticsNode] object
+  /// matching the specified id and the having a size matching the specified
+  /// subtree depth, both passed as arguments.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.getDetailsSubtree], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.getDetailsSubtree], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getDetailsSubtree,
+
+  /// Name of service extension that, when called, will return the
+  /// [DiagnosticsNode] data for the currently selected [RenderObject].
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getSelectedRenderObject], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.getSelectedRenderObject], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getSelectedRenderObject,
+
+  /// Name of service extension that, when called, will return the
+  /// [DiagnosticsNode] data for the currently selected [Element].
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getSelectedWidget], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.getSelectedWidget], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getSelectedWidget,
+
+  /// Name of service extension that, when called, will return the
+  /// [DiagnosticsNode] data for the currently selected [Element] in the summary
+  /// tree, which only includes [Element]s created in user code.
+  ///
+  /// If the selected [Element] does not exist in the summary tree, the first
+  /// ancestor in the summary tree for the currently selected [Element] will be
+  /// returned.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService._getSelectedSummaryWidget], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.getSelectedSummaryWidget], which returns a json
+  ///   encoded String representation of this data.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  getSelectedSummaryWidget,
+
+  /// Name of service extension that, when called, will return whether [Widget]
+  /// creation locations are available.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.isWidgetCreationTracked], the method that this
+  ///   service extension calls.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  isWidgetCreationTracked,
+
+  /// Name of service extension that, when called, will return a base64 encoded
+  /// image of the [RenderObject] or [Element] matching the specified 'id`,
+  /// passed as an argument, and sized at the specified 'width' and 'height'
+  /// values, also passed as arguments.
+  ///
+  /// See also:
+  ///
+  /// * [WidgetInspectorService.screenshot], the method that this service
+  ///   extension calls.
+  /// * [WidgetInspectorService.initServiceExtensions], where the service
+  ///   extension is registered.
+  screenshot,
+}

packages/flutter/lib/src/widgets/widget_inspector.dart

@@ -29,6 +29,7 @@ import 'binding.dart';
 import 'debug.dart';
 import 'framework.dart';
 import 'gesture_detector.dart';
+import 'service_extensions.dart';
 
 /// Signature for the builder callback used by
 /// [WidgetInspector.selectButtonBuilder].
@@ -1007,7 +1008,7 @@ mixin WidgetInspectorService {
     SchedulerBinding.instance.addPersistentFrameCallback(_onFrameStart);
 
     _registerBoolServiceExtension(
-      name: 'structuredErrors',
+      name: WidgetInspectorServiceExtensions.structuredErrors.name,
       getter: () async => FlutterError.presentError == _reportStructuredError,
       setter: (bool value) {
         FlutterError.presentError = value ? _reportStructuredError : defaultExceptionHandler;
@@ -1016,7 +1017,7 @@ mixin WidgetInspectorService {
     );
 
     _registerBoolServiceExtension(
-      name: 'show',
+      name: WidgetInspectorServiceExtensions.show.name,
       getter: () async => WidgetsApp.debugShowWidgetInspectorOverride,
       setter: (bool value) {
         if (WidgetsApp.debugShowWidgetInspectorOverride == value) {
@@ -1031,7 +1032,7 @@ mixin WidgetInspectorService {
       // Service extensions that are only supported if widget creation locations
       // are tracked.
       _registerBoolServiceExtension(
-        name: 'trackRebuildDirtyWidgets',
+        name: WidgetInspectorServiceExtensions.trackRebuildDirtyWidgets.name,
         getter: () async => _trackRebuildDirtyWidgets,
         setter: (bool value) async {
           if (value == _trackRebuildDirtyWidgets) {
@@ -1054,7 +1055,7 @@ mixin WidgetInspectorService {
       );
 
       _registerBoolServiceExtension(
-        name: 'trackRepaintWidgets',
+        name: WidgetInspectorServiceExtensions.trackRepaintWidgets.name,
         getter: () async => _trackRepaintWidgets,
         setter: (bool value) async {
           if (value == _trackRepaintWidgets) {
@@ -1081,92 +1082,92 @@ mixin WidgetInspectorService {
     }
 
     _registerSignalServiceExtension(
-      name: 'disposeAllGroups',
+      name: WidgetInspectorServiceExtensions.disposeAllGroups.name,
       callback: () async {
         disposeAllGroups();
         return null;
       },
     );
     _registerObjectGroupServiceExtension(
-      name: 'disposeGroup',
+      name: WidgetInspectorServiceExtensions.disposeGroup.name,
       callback: (String name) async {
         disposeGroup(name);
         return null;
       },
     );
     _registerSignalServiceExtension(
-      name: 'isWidgetTreeReady',
+      name: WidgetInspectorServiceExtensions.isWidgetTreeReady.name,
       callback: isWidgetTreeReady,
     );
     _registerServiceExtensionWithArg(
-      name: 'disposeId',
+      name: WidgetInspectorServiceExtensions.disposeId.name,
       callback: (String? objectId, String objectGroup) async {
         disposeId(objectId, objectGroup);
         return null;
       },
     );
     _registerServiceExtensionVarArgs(
-      name: 'setPubRootDirectories',
+      name: WidgetInspectorServiceExtensions.setPubRootDirectories.name,
       callback: (List<String> args) async {
         setPubRootDirectories(args);
         return null;
       },
     );
     _registerServiceExtensionVarArgs(
-      name: 'addPubRootDirectories',
+      name: WidgetInspectorServiceExtensions.addPubRootDirectories.name,
       callback: (List<String> args) async {
         addPubRootDirectories(args);
         return null;
       },
     );
     _registerServiceExtensionVarArgs(
-      name: 'removePubRootDirectories',
+      name: WidgetInspectorServiceExtensions.removePubRootDirectories.name,
       callback: (List<String> args) async {
         removePubRootDirectories(args);
         return null;
       },
     );
     _registerServiceExtensionWithArg(
-      name: 'setSelectionById',
+      name: WidgetInspectorServiceExtensions.setSelectionById.name,
       callback: setSelectionById,
     );
     _registerServiceExtensionWithArg(
-      name: 'getParentChain',
+      name: WidgetInspectorServiceExtensions.getParentChain.name,
       callback: _getParentChain,
     );
     _registerServiceExtensionWithArg(
-      name: 'getProperties',
+      name: WidgetInspectorServiceExtensions.getProperties.name,
       callback: _getProperties,
     );
     _registerServiceExtensionWithArg(
-      name: 'getChildren',
+      name: WidgetInspectorServiceExtensions.getChildren.name,
       callback: _getChildren,
     );
 
     _registerServiceExtensionWithArg(
-      name: 'getChildrenSummaryTree',
+      name: WidgetInspectorServiceExtensions.getChildrenSummaryTree.name,
       callback: _getChildrenSummaryTree,
     );
 
     _registerServiceExtensionWithArg(
-      name: 'getChildrenDetailsSubtree',
+      name: WidgetInspectorServiceExtensions.getChildrenDetailsSubtree.name,
       callback: _getChildrenDetailsSubtree,
     );
 
     _registerObjectGroupServiceExtension(
-      name: 'getRootWidget',
+      name: WidgetInspectorServiceExtensions.getRootWidget.name,
       callback: _getRootWidget,
     );
     _registerObjectGroupServiceExtension(
-      name: 'getRootRenderObject',
+      name: WidgetInspectorServiceExtensions.getRootRenderObject.name,
       callback: _getRootRenderObject,
     );
     _registerObjectGroupServiceExtension(
-      name: 'getRootWidgetSummaryTree',
+      name: WidgetInspectorServiceExtensions.getRootWidgetSummaryTree.name,
       callback: _getRootWidgetSummaryTree,
     );
     registerServiceExtension(
-      name: 'getDetailsSubtree',
+      name: WidgetInspectorServiceExtensions.getDetailsSubtree.name,
       callback: (Map<String, String> parameters) async {
         assert(parameters.containsKey('objectGroup'));
         final String? subtreeDepth = parameters['subtreeDepth'];
@@ -1180,24 +1181,24 @@ mixin WidgetInspectorService {
       },
     );
     _registerServiceExtensionWithArg(
-      name: 'getSelectedRenderObject',
+      name: WidgetInspectorServiceExtensions.getSelectedRenderObject.name,
       callback: _getSelectedRenderObject,
     );
     _registerServiceExtensionWithArg(
-      name: 'getSelectedWidget',
+      name: WidgetInspectorServiceExtensions.getSelectedWidget.name,
       callback: _getSelectedWidget,
     );
     _registerServiceExtensionWithArg(
-      name: 'getSelectedSummaryWidget',
+      name: WidgetInspectorServiceExtensions.getSelectedSummaryWidget.name,
       callback: _getSelectedSummaryWidget,
     );
 
     _registerSignalServiceExtension(
-      name: 'isWidgetCreationTracked',
+      name: WidgetInspectorServiceExtensions.isWidgetCreationTracked.name,
       callback: isWidgetCreationTracked,
     );
     registerServiceExtension(
-      name: 'screenshot',
+      name: WidgetInspectorServiceExtensions.screenshot.name,
       callback: (Map<String, String> parameters) async {
         assert(parameters.containsKey('id'));
         assert(parameters.containsKey('width'));

packages/flutter/test/widgets/widget_inspector_test.dart

@@ -1782,10 +1782,19 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       final String? aId = service.toId(a, group1);
       expect(service.toId(a, group2), equals(aId));
       expect(service.toId(a, group3), equals(aId));
-      await service.testExtension('disposeGroup', <String, String>{'objectGroup': group1});
-      await service.testExtension('disposeGroup', <String, String>{'objectGroup': group2});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.disposeGroup.name,
+        <String, String>{'objectGroup': group1},
+      );
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.disposeGroup.name,
+        <String, String>{'objectGroup': group2},
+      );
       expect(service.toObject(aId), equals(a));
-      await service.testExtension('disposeGroup', <String, String>{'objectGroup': group3});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.disposeGroup.name,
+        <String, String>{'objectGroup': group3},
+      );
       expect(() => service.toObject(aId), throwsFlutterError);
     });
 
@@ -1797,11 +1806,20 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       final String aId = service.toId(a, group1)!;
       final String bId = service.toId(b, group1)!;
       expect(service.toId(a, group2), equals(aId));
-      await service.testExtension('disposeId', <String, String>{'arg': bId, 'objectGroup': group1});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.disposeId.name,
+        <String, String>{'arg': bId, 'objectGroup': group1},
+      );
       expect(() => service.toObject(bId), throwsFlutterError);
-      await service.testExtension('disposeId', <String, String>{'arg': aId, 'objectGroup': group1});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.disposeId.name,
+        <String, String>{'arg': aId, 'objectGroup': group1},
+      );
       expect(service.toObject(aId), equals(a));
-      await service.testExtension('disposeId', <String, String>{'arg': aId, 'objectGroup': group2});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.disposeId.name,
+        <String, String>{'arg': aId, 'objectGroup': group2},
+      );
       expect(() => service.toObject(aId), throwsFlutterError);
     });
 
@@ -1842,7 +1860,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       expect(selectionChangedCount, equals(2));
       expect(service.selection.current, equals(elementB.renderObject));
 
-      await service.testExtension('setSelectionById', <String, String>{'arg': service.toId(elementA, 'my-group')!, 'objectGroup': 'my-group'});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.setSelectionById.name,
+        <String, String>{'arg': service.toId(elementA, 'my-group')!, 'objectGroup': 'my-group'},
+      );
       expect(selectionChangedCount, equals(3));
       expect(service.selection.currentElement, equals(elementA));
       expect(service.selection.current, equals(elementA.renderObject));
@@ -1870,7 +1891,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       final Element elementB = find.text('b').evaluate().first;
       final String bId = service.toId(elementB, group)!;
-      final Object? jsonList = await service.testExtension('getParentChain', <String, String>{'arg': bId, 'objectGroup': group});
+      final Object? jsonList = await service.testExtension(
+        WidgetInspectorServiceExtensions.getParentChain.name,
+        <String, String>{'arg': bId, 'objectGroup': group},
+      );
       expect(jsonList, isList);
       final List<Object?> chainElements = jsonList! as List<Object?>;
       final List<Element> expectedChain = elementB.debugGetDiagnosticChain().reversed.toList();
@@ -1910,7 +1934,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       final DiagnosticsNode diagnostic = const Text('a', textDirection: TextDirection.ltr).toDiagnosticsNode();
       const String group = 'group';
       final String id = service.toId(diagnostic, group)!;
-      final List<Object?> propertiesJson = (await service.testExtension('getProperties', <String, String>{'arg': id, 'objectGroup': group}))! as List<Object?>;
+      final List<Object?> propertiesJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getProperties.name,
+        <String, String>{'arg': id, 'objectGroup': group},
+      ))! as List<Object?>;
       final List<DiagnosticsNode> properties = diagnostic.getProperties();
       expect(properties, isNotEmpty);
       expect(propertiesJson.length, equals(properties.length));
@@ -1938,7 +1965,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       );
       final DiagnosticsNode diagnostic = find.byType(Stack).evaluate().first.toDiagnosticsNode();
       final String id = service.toId(diagnostic, group)!;
-      final List<Object?> propertiesJson = (await service.testExtension('getChildren', <String, String>{'arg': id, 'objectGroup': group}))! as List<Object?>;
+      final List<Object?> propertiesJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getChildren.name,
+        <String, String>{'arg': id, 'objectGroup': group},
+      ))! as List<Object?>;
       final List<DiagnosticsNode> children = diagnostic.getChildren();
       expect(children.length, equals(3));
       expect(propertiesJson.length, equals(children.length));
@@ -1966,7 +1996,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       );
       final DiagnosticsNode diagnostic = find.byType(Stack).evaluate().first.toDiagnosticsNode();
       final String id = service.toId(diagnostic, group)!;
-      final List<Object?> childrenJson = (await service.testExtension('getChildrenDetailsSubtree', <String, String>{'arg': id, 'objectGroup': group}))! as List<Object?>;
+      final List<Object?> childrenJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getChildrenDetailsSubtree.name,
+        <String, String>{'arg': id, 'objectGroup': group},
+      ))! as List<Object?>;
       final List<DiagnosticsNode> children = diagnostic.getChildren();
       expect(children.length, equals(3));
       expect(childrenJson.length, equals(children.length));
@@ -2002,7 +2035,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       );
       final DiagnosticsNode diagnostic = find.byType(Stack).evaluate().first.toDiagnosticsNode();
       final String id = service.toId(diagnostic, group)!;
-      final Map<String, Object?> subtreeJson = (await service.testExtension('getDetailsSubtree', <String, String>{'arg': id, 'objectGroup': group}))! as Map<String, Object?>;
+      final Map<String, Object?> subtreeJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getDetailsSubtree.name,
+        <String, String>{'arg': id, 'objectGroup': group},
+      ))! as Map<String, Object?>;
       expect(subtreeJson['objectId'], equals(id));
       final List<Object?> childrenJson = subtreeJson['children']! as List<Object?>;
       final List<DiagnosticsNode> children = diagnostic.getChildren();
@@ -2026,7 +2062,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       }
 
       final Map<String, Object?> deepSubtreeJson = (await service.testExtension(
-        'getDetailsSubtree',
+        WidgetInspectorServiceExtensions.getDetailsSubtree.name,
         <String, String>{'arg': id, 'objectGroup': group, 'subtreeDepth': '3'},
       ))! as Map<String, Object?>;
       final List<Object?> deepChildrenJson = deepSubtreeJson['children']! as List<Object?>;
@@ -2048,7 +2084,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       final DiagnosticsNode diagnostic = a.toDiagnosticsNode();
       final String id = service.toId(diagnostic, group)!;
-      final Map<String, Object?> subtreeJson = (await service.testExtension('getDetailsSubtree', <String, String>{'arg': id, 'objectGroup': group}))! as Map<String, Object?>;
+      final Map<String, Object?> subtreeJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getDetailsSubtree.name,
+        <String, String>{'arg': id, 'objectGroup': group},
+      ))! as Map<String, Object?>;
       expect(subtreeJson['objectId'], equals(id));
       expect(subtreeJson, contains('children'));
       final List<Object?> propertiesJson = subtreeJson['properties']! as List<Object?>;
@@ -2092,10 +2131,16 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       service.disposeAllGroups();
       service.resetPubRootDirectories();
       service.setSelection(elementA, 'my-group');
-      final Map<String, dynamic> jsonA = (await service.testExtension('getSelectedWidget', <String, String>{'objectGroup': 'my-group'}))! as Map<String, dynamic>;
+      final Map<String, dynamic> jsonA = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
+        <String, String>{'objectGroup': 'my-group'},
+      ))! as Map<String, dynamic>;
 
       service.resetPubRootDirectories();
-      Map<String, Object?> rootJson = (await service.testExtension('getRootWidgetSummaryTree', <String, String>{'objectGroup': group}))! as Map<String, Object?>;
+      Map<String, Object?> rootJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getRootWidgetSummaryTree.name,
+        <String, String>{'objectGroup': group},
+      ))! as Map<String, Object?>;
       // We haven't yet properly specified which directories are summary tree
       // directories so we get an empty tree other than the root that is always
       // included.
@@ -2114,16 +2159,25 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       // directory.
       final String pubRootTest = '/${segments.take(segments.length - 2).join('/')}';
       service.resetPubRootDirectories();
-      await service.testExtension('addPubRootDirectories', <String, String>{'arg0': pubRootTest});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+        <String, String>{'arg0': pubRootTest},
+      );
 
-      rootJson = (await service.testExtension('getRootWidgetSummaryTree', <String, String>{'objectGroup': group}))! as Map<String, Object?>;
+      rootJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getRootWidgetSummaryTree.name,
+        <String, String>{'objectGroup': group},
+      ))! as Map<String, Object?>;
       childrenJson = rootJson['children']! as List<Object?>;
       // The tree of nodes returned contains all widgets created directly by the
       // test.
       childrenJson = rootJson['children']! as List<Object?>;
       expect(childrenJson.length, equals(1));
 
-      List<Object?> alternateChildrenJson = (await service.testExtension('getChildrenSummaryTree', <String, String>{'arg': rootJson['objectId']! as String, 'objectGroup': group}))! as List<Object?>;
+      List<Object?> alternateChildrenJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getChildrenSummaryTree.name,
+        <String, String>{'arg': rootJson['objectId']! as String, 'objectGroup': group},
+      ))! as List<Object?>;
       expect(alternateChildrenJson.length, equals(1));
       Map<String, Object?> childJson = childrenJson[0]! as Map<String, Object?>;
       Map<String, Object?> alternateChildJson = alternateChildrenJson[0]! as Map<String, Object?>;
@@ -2132,7 +2186,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       expect(alternateChildJson['valueId'], equals(childJson['valueId']));
 
       childrenJson = childJson['children']! as List<Object?>;
-      alternateChildrenJson = (await service.testExtension('getChildrenSummaryTree', <String, String>{'arg': childJson['objectId']! as String, 'objectGroup': group}))! as List<Object?>;
+      alternateChildrenJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getChildrenSummaryTree.name,
+        <String, String>{'arg': childJson['objectId']! as String, 'objectGroup': group},
+      ))! as List<Object?>;
       expect(alternateChildrenJson.length, equals(1));
       expect(childrenJson.length, equals(1));
       alternateChildJson = alternateChildrenJson[0]! as Map<String, Object?>;
@@ -2143,7 +2200,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       childrenJson = childJson['children']! as List<Object?>;
 
       childrenJson = childJson['children']! as List<Object?>;
-      alternateChildrenJson = (await service.testExtension('getChildrenSummaryTree', <String, String>{'arg': childJson['objectId']! as String, 'objectGroup': group}))! as List<Object?>;
+      alternateChildrenJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getChildrenSummaryTree.name,
+        <String, String>{'arg': childJson['objectId']! as String, 'objectGroup': group},
+      ))! as List<Object?>;
       expect(alternateChildrenJson.length, equals(3));
       expect(childrenJson.length, equals(3));
       alternateChildJson = alternateChildrenJson[2]! as Map<String, Object?>;
@@ -2151,7 +2211,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       expect(childJson['description'], startsWith('Text'));
       expect(alternateChildJson['description'], startsWith('Text'));
       expect(alternateChildJson['valueId'], equals(childJson['valueId']));
-      alternateChildrenJson = (await service.testExtension('getChildrenSummaryTree', <String, String>{'arg': childJson['objectId']! as String, 'objectGroup': group}))! as List<Object?>;
+      alternateChildrenJson = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getChildrenSummaryTree.name,
+        <String, String>{'arg': childJson['objectId']! as String, 'objectGroup': group},
+      ))! as List<Object?>;
       expect(alternateChildrenJson.length , equals(0));
       // Tests are failing when this typo is fixed.
       expect(childJson['chidlren'], isNull);
@@ -2181,11 +2244,17 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       service.disposeAllGroups();
       service.resetPubRootDirectories();
       service.setSelection(elementA, 'my-group');
-      final Map<String, Object?> jsonA = (await service.testExtension('getSelectedWidget', <String, String>{'objectGroup': 'my-group'}))! as Map<String, Object?>;
+      final Map<String, Object?> jsonA = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
+        <String, String>{'objectGroup': 'my-group'},
+      ))! as Map<String, Object?>;
       service.setSelection(richTextDiagnostic.value, 'my-group');
 
       service.resetPubRootDirectories();
-      Map<String, Object?>? summarySelection = await service.testExtension('getSelectedSummaryWidget', <String, String>{'objectGroup': group}) as Map<String, Object?>?;
+      Map<String, Object?>? summarySelection = await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedSummaryWidget.name,
+        <String, String>{'objectGroup': group},
+      ) as Map<String, Object?>?;
       // No summary selection because we haven't set the pub root directories
       // yet to indicate what directories are in the summary tree.
       expect(summarySelection, isNull);
@@ -2199,9 +2268,15 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       // directory.
       final String pubRootTest = '/${segments.take(segments.length - 2).join('/')}';
       service.resetPubRootDirectories();
-      await service.testExtension('addPubRootDirectories', <String, String>{'arg0': pubRootTest});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+        <String, String>{'arg0': pubRootTest},
+      );
 
-      summarySelection = (await service.testExtension('getSelectedSummaryWidget', <String, String>{'objectGroup': group}))! as Map<String, Object?>;
+      summarySelection = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedSummaryWidget.name,
+        <String, String>{'objectGroup': group},
+      ))! as Map<String, Object?>;
       expect(summarySelection['valueId'], isNotNull);
       // We got the Text element instead of the selected RichText element
       // because only the RichText element is part of the summary tree.
@@ -2209,7 +2284,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       // Verify tha the regular getSelectedWidget method still returns
       // the RichText object not the Text element.
-      final Map<String, Object?> regularSelection = (await service.testExtension('getSelectedWidget', <String, String>{'objectGroup': 'my-group'}))! as Map<String, Object?>;
+      final Map<String, Object?> regularSelection = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
+        <String, String>{'objectGroup': 'my-group'},
+      ))! as Map<String, Object?>;
       expect(service.toObject(regularSelection['valueId']! as String), richTextDiagnostic.value);
     }, skip: !WidgetInspectorService.instance.isWidgetCreationTracked()); // [intended] Test requires --track-widget-creation flag.
 
@@ -2232,7 +2310,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       service.disposeAllGroups();
       service.resetPubRootDirectories();
       service.setSelection(elementA, 'my-group');
-      final Map<String, Object?> jsonA = (await service.testExtension('getSelectedWidget', <String, String>{'objectGroup': 'my-group'}))! as Map<String, Object?>;
+      final Map<String, Object?> jsonA = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
+        <String, String>{'objectGroup': 'my-group'},
+      ))! as Map<String, Object?>;
       final Map<String, Object?> creationLocationA = jsonA['creationLocation']! as Map<String, Object?>;
       expect(creationLocationA, isNotNull);
       final String fileA = creationLocationA['file']! as String;
@@ -2240,7 +2321,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       final int columnA = creationLocationA['column']! as int;
 
       service.setSelection(elementB, 'my-group');
-      final Map<String, Object?> jsonB = (await service.testExtension('getSelectedWidget', <String, String>{'objectGroup': 'my-group'}))! as Map<String, Object?>;
+      final Map<String, Object?> jsonB = (await service.testExtension(
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
+        <String, String>{'objectGroup': 'my-group'},
+      ))! as Map<String, Object?>;
       final Map<String, Object?> creationLocationB = jsonB['creationLocation']! as Map<String, Object?>;
       expect(creationLocationB, isNotNull);
       final String fileB = creationLocationB['file']! as String;
@@ -2289,12 +2373,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
 
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': pubRootTest},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2322,12 +2406,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
 
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': '/invalid/$pubRootTest'},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               isNot(contains('createdByLocalProject')),
@@ -2355,12 +2439,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
 
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': 'file://$pubRootTest'},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2388,12 +2472,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
 
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': '$pubRootTest/different'},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               isNot(contains('createdByLocalProject')),
@@ -2420,14 +2504,17 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             final Element elementA = find.text('a').evaluate().first;
             service.setSelection(elementA, 'my-group');
 
-            await service.testExtension('addPubRootDirectories', <String, String>{
+            await service.testExtension(
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+              <String, String>{
                 'arg0': '/unrelated/$pubRootTest',
                 'arg1': 'file://$pubRootTest',
-            });
+              },
+            );
 
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2484,12 +2571,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
                 '/${pathSegmentsFramework.take(pathSegmentsFramework.length - 3).join('/')}';
             service.resetPubRootDirectories();
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': pubRootFramework},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2497,7 +2584,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               isNot(contains('createdByLocalProject')),
@@ -2505,13 +2592,13 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
             service.resetPubRootDirectories();
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': pubRootFramework, 'arg1': pubRootTest},
             );
             service.setSelection(elementA, 'my-group');
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2519,7 +2606,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(richText, 'my-group');
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2565,12 +2652,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
 
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': pubRootTest, 'isolateId': '34'},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2596,13 +2683,16 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             final Element elementA = find.text('a').evaluate().first;
             service.setSelection(elementA, 'my-group');
 
-            await service.testExtension('addPubRootDirectories', <String, String>{
+            await service.testExtension(
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+              <String, String>{
                 'arg0': '/invalid/$pubRootTest',
                 'isolateId': '34'
-            });
+              },
+            );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               isNot(contains('createdByLocalProject')),
@@ -2629,12 +2719,12 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             service.setSelection(elementA, 'my-group');
 
             await service.testExtension(
-              'addPubRootDirectories',
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
               <String, String>{'arg0': 'file://$pubRootTest', 'isolateId': '34'},
             );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2660,13 +2750,16 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             final Element elementA = find.text('a').evaluate().first;
             service.setSelection(elementA, 'my-group');
 
-            await service.testExtension('addPubRootDirectories', <String, String>{
+            await service.testExtension(
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+              <String, String>{
                 'arg0': '$pubRootTest/different',
                 'isolateId': '34'
-            });
+              },
+            );
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               isNot(contains('createdByLocalProject')),
@@ -2692,15 +2785,18 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
             final Element elementA = find.text('a').evaluate().first;
             service.setSelection(elementA, 'my-group');
 
-            await service.testExtension('addPubRootDirectories', <String, String>{
+            await service.testExtension(
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+              <String, String>{
                 'arg0': '/unrelated/$pubRootTest',
                 'isolateId': '34',
                 'arg1': 'file://$pubRootTest',
-            });
+              },
+            );
 
             expect(
               await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ),
               contains('createdByLocalProject'),
@@ -2746,7 +2842,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
 
           await service.testExtension(
-            'addPubRootDirectories',
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
             <String, String>{
               'arg0': pubRootTest,
               'arg1': 'file://$pubRootTest',
@@ -2756,14 +2852,14 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           service.setSelection(elementA, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
           );
 
           await service.testExtension(
-            'removePubRootDirectories',
+            WidgetInspectorServiceExtensions.removePubRootDirectories.name,
             <String, String>{
               'arg0': pubRootTest,
             },
@@ -2771,7 +2867,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           service.setSelection(elementA, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             isNot(contains('createdByLocalProject')),
@@ -2796,13 +2892,16 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0': '$pubRootTest/different',
               'arg1': '/unrelated/$pubRootTest',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             isNot(contains('createdByLocalProject')),
@@ -2827,12 +2926,13 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
-            'arg0':'file://$pubRootTest'
-          });
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{'arg0':'file://$pubRootTest'},
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
@@ -2857,15 +2957,17 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
-            'arg0': pubRootTest,
-          });
-          service.testExtension('addPubRootDirectories', <String, String>{
-            'arg0': '/invalid/$pubRootTest',
-          });
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{'arg0': pubRootTest},
+          );
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{'arg0': '/invalid/$pubRootTest'},
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
@@ -2889,24 +2991,28 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0': pubRootTest,
               'arg1': '/invalid/$pubRootTest',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
           );
 
-          service.testExtension('removePubRootDirectories', <String, String>{
-            'arg0': '/invalid/$pubRootTest',
-          });
+          service.testExtension(
+            WidgetInspectorServiceExtensions.removePubRootDirectories.name,
+            <String, String>{'arg0': '/invalid/$pubRootTest'},
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
@@ -2937,11 +3043,14 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
               .evaluate()
               .first;
           service.setSelection(richText, 'my-group');
-          service.testExtension('addPubRootDirectories', <String, String>{ 'arg0': pubRootTest });
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{ 'arg0': pubRootTest },
+          );
 
           final Map<String, Object?> jsonObject =
               (await service.testExtension(
-                'getSelectedWidget',
+                WidgetInspectorServiceExtensions.getSelectedWidget.name,
                 <String, String>{'objectGroup': 'my-group'},
               ))! as Map<String, Object?>;
           expect(jsonObject, isNot(contains('createdByLocalProject')));
@@ -2961,10 +3070,13 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final String pubRootFramework =
               '/${pathSegmentsFramework.take(pathSegmentsFramework.length - 3).join('/')}';
           service.resetPubRootDirectories();
-          service.testExtension('addPubRootDirectories', <String, String>{'arg0': pubRootFramework});
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{'arg0': pubRootFramework},
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
@@ -2972,22 +3084,24 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           service.setSelection(elementA, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             isNot(contains('createdByLocalProject')),
           );
 
           service.resetPubRootDirectories();
-          service
-              .testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0': pubRootFramework,
-                'arg1': pubRootTest
-              });
+              'arg1': pubRootTest,
+            },
+          );
           service.setSelection(elementA, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
@@ -2995,7 +3109,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           service.setSelection(richText, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group'},
             ),
             contains('createdByLocalProject'),
@@ -3034,7 +3148,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
 
           await service.testExtension(
-            'addPubRootDirectories',
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
             <String, String>{
               'arg0': pubRootTest,
               'arg1': 'file://$pubRootTest',
@@ -3045,14 +3159,14 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           service.setSelection(elementA, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
             ),
             contains('createdByLocalProject'),
           );
 
           await service.testExtension(
-            'removePubRootDirectories',
+            WidgetInspectorServiceExtensions.removePubRootDirectories.name,
             <String, String>{
               'arg0': pubRootTest,
               'isolateId': '34',
@@ -3061,7 +3175,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           service.setSelection(elementA, 'my-group');
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
             ),
             isNot(contains('createdByLocalProject')),
@@ -3086,13 +3200,16 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0': '$pubRootTest/different',
               'arg1': '/unrelated/$pubRootTest',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
             ),
             isNot(contains('createdByLocalProject')),
@@ -3117,13 +3234,16 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0':'file://$pubRootTest',
               'isolateId': '34',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
             ),
             contains('createdByLocalProject'),
@@ -3148,17 +3268,23 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0': pubRootTest,
               'isolateId': '34',
-          });
-          service.testExtension('addPubRootDirectories', <String, String>{
+            },
+          );
+          service.testExtension(
+            WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+            <String, String>{
               'arg0': '/invalid/$pubRootTest',
               'isolateId': '34',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
               <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
             ),
             contains('createdByLocalProject'),
@@ -3182,27 +3308,39 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
           final Element elementA = find.text('a').evaluate().first;
           service.setSelection(elementA, 'my-group');
 
-          service.testExtension('addPubRootDirectories', <String, String>{
+          service.testExtension(
+              WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+              <String, String>{
               'arg0': pubRootTest,
               'arg1': '/invalid/$pubRootTest',
               'isolateId': '34',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
-              <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
+              <String, String>{
+                'objectGroup': 'my-group',
+                'isolateId': '34',
+              },
             ),
             contains('createdByLocalProject'),
           );
 
-          service.testExtension('removePubRootDirectories', <String, String>{
+          service.testExtension(
+            WidgetInspectorServiceExtensions.removePubRootDirectories.name,
+            <String, String>{
               'arg0': '/invalid/$pubRootTest',
               'isolateId': '34',
-          });
+            },
+          );
           expect(
             await service.testExtension(
-              'getSelectedWidget',
-              <String, String>{'objectGroup': 'my-group', 'isolateId': '34',},
+              WidgetInspectorServiceExtensions.getSelectedWidget.name,
+              <String, String>{
+                'objectGroup': 'my-group',
+                'isolateId': '34',
+              },
             ),
             contains('createdByLocalProject'),
           );
@@ -3221,7 +3359,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       service.setSelection(clockDemoElement, 'my-group');
       final Map<String, Object?> jsonObject = (await service.testExtension(
-        'getSelectedWidget',
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
         <String, String>{'objectGroup': 'my-group'},
       ))! as Map<String, Object?>;
       final Map<String, Object?> creationLocation = jsonObject['creationLocation']! as Map<String, Object?>;
@@ -3233,7 +3371,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       // directory.
       final String pubRootTest = '/${segments.take(segments.length - 2).join('/')}';
       service.resetPubRootDirectories();
-      await service.testExtension('addPubRootDirectories', <String, String>{'arg0': pubRootTest});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+        <String, String>{'arg0': pubRootTest},
+      );
 
       final List<Map<Object, Object?>> rebuildEvents =
           service.getEventsDispatched('Flutter.RebuiltWidgets');
@@ -3241,7 +3382,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       expect(service.rebuildCount, equals(0));
       expect(
-        await service.testBoolExtension('trackRebuildDirtyWidgets', <String, String>{'enabled': 'true'}),
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.trackRebuildDirtyWidgets.name,
+          <String, String>{'enabled': 'true'},
+        ),
         equals('true'),
       );
       expect(service.rebuildCount, equals(1));
@@ -3412,7 +3556,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       // Turn off rebuild counts.
       expect(
-        await service.testBoolExtension('trackRebuildDirtyWidgets', <String, String>{'enabled': 'false'}),
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.trackRebuildDirtyWidgets.name,
+          <String, String>{'enabled': 'false'},
+        ),
         equals('false'),
       );
 
@@ -3431,7 +3578,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       service.setSelection(clockDemoElement, 'my-group');
       final Map<String, Object?> jsonObject = (await service.testExtension(
-        'getSelectedWidget',
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
         <String, String>{'objectGroup': 'my-group'},
       ))! as Map<String, Object?>;
       final Map<String, Object?> creationLocation =
@@ -3444,7 +3591,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       // directory.
       final String pubRootTest = '/${segments.take(segments.length - 2).join('/')}';
       service.resetPubRootDirectories();
-      await service.testExtension('addPubRootDirectories', <String, String>{'arg0': pubRootTest});
+      await service.testExtension(
+        WidgetInspectorServiceExtensions.addPubRootDirectories.name,
+        <String, String>{'arg0': pubRootTest},
+      );
 
       final List<Map<Object, Object?>> repaintEvents =
           service.getEventsDispatched('Flutter.RepaintWidgets');
@@ -3452,7 +3602,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       expect(service.rebuildCount, equals(0));
       expect(
-        await service.testBoolExtension('trackRepaintWidgets', <String, String>{'enabled': 'true'}),
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.trackRepaintWidgets.name,
+          <String, String>{'enabled': 'true'},
+        ),
         equals('true'),
       );
       // Unlike trackRebuildDirtyWidgets, trackRepaintWidgets doesn't force a full
@@ -3526,7 +3679,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       // Turn off rebuild counts.
       expect(
-        await service.testBoolExtension('trackRepaintWidgets', <String, String>{'enabled': 'false'}),
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.trackRepaintWidgets.name,
+          <String, String>{'enabled': 'false'},
+        ),
         equals('false'),
       );
 
@@ -3542,27 +3698,57 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       service.rebuildCount = 0;
       expect(extensionChangedEvents, isEmpty);
-      expect(await service.testBoolExtension('show', <String, String>{'enabled': 'true'}), equals('true'));
+      expect(
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.show.name,
+          <String, String>{'enabled': 'true'},
+        ),
+        equals('true'),
+      );
       expect(extensionChangedEvents.length, equals(1));
       extensionChangedEvent = extensionChangedEvents.last;
       expect(extensionChangedEvent['extension'], equals('ext.flutter.inspector.show'));
       expect(extensionChangedEvent['value'], isTrue);
       expect(service.rebuildCount, equals(1));
-      expect(await service.testBoolExtension('show', <String, String>{}), equals('true'));
+      expect(
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.show.name,
+          <String, String>{},
+        ),
+        equals('true'),
+      );
       expect(WidgetsApp.debugShowWidgetInspectorOverride, isTrue);
       expect(extensionChangedEvents.length, equals(1));
-      expect(await service.testBoolExtension('show', <String, String>{'enabled': 'true'}), equals('true'));
+      expect(
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.show.name,
+          <String, String>{'enabled': 'true'},
+        ),
+        equals('true'),
+      );
       expect(extensionChangedEvents.length, equals(2));
       extensionChangedEvent = extensionChangedEvents.last;
       expect(extensionChangedEvent['extension'], equals('ext.flutter.inspector.show'));
       expect(extensionChangedEvent['value'], isTrue);
       expect(service.rebuildCount, equals(1));
-      expect(await service.testBoolExtension('show', <String, String>{'enabled': 'false'}), equals('false'));
+      expect(
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.show.name,
+          <String, String>{'enabled': 'false'},
+        ),
+        equals('false'),
+      );
       expect(extensionChangedEvents.length, equals(3));
       extensionChangedEvent = extensionChangedEvents.last;
       expect(extensionChangedEvent['extension'], equals('ext.flutter.inspector.show'));
       expect(extensionChangedEvent['value'], isFalse);
-      expect(await service.testBoolExtension('show', <String, String>{}), equals('false'));
+      expect(
+        await service.testBoolExtension(
+          WidgetInspectorServiceExtensions.show.name,
+          <String, String>{},
+        ),
+        equals('false'),
+      );
       expect(extensionChangedEvents.length, equals(3));
       expect(service.rebuildCount, equals(2));
       expect(WidgetsApp.debugShowWidgetInspectorOverride, isFalse);
@@ -3815,7 +4001,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       // Verify we get the same image if we go through the service extension
       // instead of invoking the screenshot method directly.
       final Future<Object?> base64ScreenshotFuture = service.testExtension(
-        'screenshot',
+        WidgetInspectorServiceExtensions.screenshot.name,
         <String, String>{
           'id': service.toId(clipRect, 'group')!,
           'width': '100.0',
@@ -3882,7 +4068,10 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
       try {
         // Enable structured errors.
         expect(
-          await service.testBoolExtension('structuredErrors', <String, String>{'enabled': 'true'}),
+          await service.testBoolExtension(
+            WidgetInspectorServiceExtensions.structuredErrors.name,
+            <String, String>{'enabled': 'true'},
+          ),
           equals('true'),
         );
 
@@ -4175,7 +4364,7 @@ class _TestWidgetInspectorService extends TestWidgetInspectorService {
 
       // Figure out the pubRootDirectory
       final Map<String, Object?> jsonObject = (await service.testExtension(
-          'getSelectedWidget',
+        WidgetInspectorServiceExtensions.getSelectedWidget.name,
         <String, String>{'objectGroup': 'my-group'},
       ))! as Map<String, Object?>;
       final Map<String, Object?> creationLocation = jsonObject['creationLocation']! as Map<String, Object?>;