Race condition errors after hot restart for flutter_web

[jakemac53]

After doing a hot restart through the devtools button I occasionally get one of these two different errors:

Uncaught Server error (-32000) from ext.flutter.inspector.getChildrenDetailsSubtree():
{"exception":"Id does not exist.","stack":"dart:sdk_internal 4556:11                        throw
package:flutter_web/packages/flutter_web/src/widgets/widget_inspector.dart 1276:7           toObject
package:flutter_web/packages/flutter_web/src/widgets/widget_inspector.dart 1686:34          [_getChildrenDetailsSubtree]
package:flutter_web/packages/flutter_web/src/widgets/widget_inspector.dart 949:29           <fn>
dart:sdk_internal 22358:7                                                                   async
package:flutter_web/packages/flutter_web/src/widgets/widget_inspector.dart 945:38           <fn>
package:flutter_web/src/foundation/packages/flutter_web/src/foundation/binding.dart 527:32  <fn>
dart:sdk_internal 15521:9                                                                   internalCallback
","method":"ext.flutter.inspector.getChildrenDetailsSubtree"}

Unexpected error from chrome devtools:
text: Uncaught (in promise)
exception:
  description: null
  type: string
  value: NoSuchMethodError: tried to call a non-function, such as null: 'method'
attempted eval: `require("dart_sdk").developer.invokeExtension(
    "ext.flutter.inspector.getRootWidgetSummaryTree", JSON.stringify({"objectGroup":"temp_30"}));
`
 (-32603) from ext.flutter.inspector.getRootWidgetSummaryTree()

They both seem related, I think that devtools is trying to call some service extensions before they are ready?

[jakemac53]

Actually closing this as I believe it was a race condition on our end, and was fixed by dart-lang/webdev#311.