[protoc_plugin] Error `The method '$_clearField' isn't defined for the class 'DartMixin'.`

[jonasbadstuebner]

dart pub global activate -sgit https://github.com/google/protobuf.dart.git --git-path protoc_plugin/
gives me the following error:

* protoc_plugin 22.0.0-dev from git https://github.com/google/protobuf.dart.git at b76135 in protoc_plugin (was 21.1.2)                                                                                                                                                                                                   
Building package executables...                                                                                                                                                                                                                                                                                           
Failed to build protoc_plugin:protoc_plugin:                                                                                                                                                                                                                                                                              
../../../../../../.pub-cache/git/protobuf.dart-b7613581d847e1e36e76f0e36db3a412d8fea5b1/protoc_plugin/lib/src/generated/dart_options.pb.dart:85:23: Error: The method '$_clearField' isn't defined for the class 'DartMixin'.

ref is b761358

Dart SDK version: 3.3.1 (stable) (Wed Mar 6 13:09:19 2024 +0000) on "linux_x64"

dart pub global activate -sgit https://github.com/google/protobuf.dart.git --git-path protoc_plugin --git-ref 1822b81df565f7b7d54450b33fa2c997f69a9995 works as expected, so the problem is somewhere in b761358

Am I missing something or is this a newly introduced problem?

[osa1]

protoc_plugin in b761358 can only be compiled with the protobuf in the same commit (or later). Since we don't override the protobuf dependency to ../protobuf (I don't even know if that's possible when running dart pub global activate ...) it's trying to use the latest released protobuf library, which is not compatible.

Things to fix:

• The commit forgot to bump protobuf dependency version. We should bump it to 4.0.0.
  After that the command will fail because 4.0.0 is not published yet.

• If possible, override protobuf dependency to ../protobuf when installing from the git repo, because that's the only way to make sure it will always work. However I'm not sure if this is possible.

Note that after the second step above your project may fail to compile unless you also use the protobuf library from the git repo with the same rev as the protoc_plugin.