Flutter_html: flutter_svg dependency build failed

[Aoi-hosizora]

After I upgrade Flutter to 1.20.0-3.0.pre.142, my project builds failed (see logs). I find that flutter_svg 0.17.4 is depended by flutter_html 1.0.0. I have found an issue related to this problem: https://github.com/dnfield/flutter_svg/issues/368, but it says to update flutter_svg to 0.18.0+. So how could I fix this problem?

Launching lib\main.dart on Google Nexus 5X Android 8 in debug mode...
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:88:26: Error: Type 'DiagnosticableMixin' not found.
class PictureStream with DiagnosticableMixin {
                         ^^^^^^^^^^^^^^^^^^^
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:192:44: Error: Type 'DiagnosticableMixin' not found.
abstract class PictureStreamCompleter with DiagnosticableMixin {
                                           ^^^^^^^^^^^^^^^^^^^
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:88:7: Error: The type 'DiagnosticableMixin' can't be mixed in.
class PictureStream with DiagnosticableMixin {
      ^
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:192:16: Error: The type 'DiagnosticableMixin' can't be mixed in.
abstract class PictureStreamCompleter with DiagnosticableMixin {
               ^
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:167:11: Error: Superclass has no method named 'debugFillProperties'.
    super.debugFillProperties(properties);
          ^^^^^^^^^^^^^^^^^^^
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:171:30: Error: The method 'toStringShort' isn't defined for the class 'PictureStreamCompleter'.
 - 'PictureStreamCompleter' is from 'package:flutter_svg/src/picture_stream.dart' ('/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart').
Try correcting the name to the name of an existing method, or defining a method named 'toStringShort'.
      ifPresent: _completer?.toStringShort(),
                             ^^^^^^^^^^^^^
/C:/Users/Windows%2010/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.4/lib/src/picture_stream.dart:266:11: Error: Superclass has no method named 'debugFillProperties'.
    super.debugFillProperties(description);
          ^^^^^^^^^^^^^^^^^^^


FAILURE: Build failed with an exception.

[ueman]

You can do a dependency override by specifying this in your pubspec:

dependency_overrides:
  flutter_svg: 0.18.0

It will get fixed when the next flutter stable gets released:

https://github.com/Sub6Resources/flutter_html/pull/332

[Aoi-hosizora]

@ueman I see, now I have to use dependency_overrides and it works. So when next version is released, this will be fixed?

[sparkidea-codecrab]

@Aoi-hosizora Hi, How did you resolve this issue? I am having the same issue. I tried adding dependency overrides but same issue. Can you share your pubsec?

[Aoi-hosizora]

@sparkidea-codecrab Here is my pubspec.yaml, I override dependency version (although it logs warning) and it works.

dependencies:
  # ...
  flutter_html: ^1.0.0
  # ...

dependency_overrides:
  flutter_svg: 0.18.0

And here is my generated pubspec.lock:

  flutter_html:
    dependency: "direct main"
    description:
      name: flutter_html
      url: "https://pub.flutter-io.cn"
    source: hosted
    version: "1.0.0"


  flutter_svg:
    dependency: "direct overridden"
    description:
      name: flutter_svg
      url: "https://pub.flutter-io.cn"
    source: hosted
    version: "0.18.0"

[sparkidea-codecrab]

@Aoi-hosizora Do I also have to add flutter_svg: ^0.17.4 on dependencies section?

[Aoi-hosizora]

@sparkidea-codecrab No, flutter_html will dependent flutter_svg 0.17.4, and it will add to lock file automatically. So we have to override this version using dependency_overrides.

[sparkidea-codecrab]

@Aoi-hosizora I just did the same, but not luck. Got this:
[learning_kart_app] flutter pub get
Running "flutter pub get" in learning_kart_app...
Because flutter_svg >=0.18.0 depends on xml ^4.1.0 and every version of flutter_test from sdk depends on xml 3.6.1, flutter_svg >=0.18.0 is incompatible with flutter_test from sdk.

So, because kart depends on both flutter_test any from sdk and flutter_svg 0.18.0, version solving failed.
pub get failed (1; So, because kart depends on both flutter_test any from sdk and flutter_svg 0.18.0, version solving failed.)
exit code 1

[sparkidea-codecrab]

@Aoi-hosizora I resolved it.. thank you!

[Aoi-hosizora]

I have solved this problem temporarily using dependency_overrides. So I just close this issue.

[garshom]

Solved it by adding dependency_overides in pubspec.xml

dependency_overrides:
flutter_svg: 0.18.0