Dart run build_runner build fails on Flutter 3.44.0, source_gen 3.1.0 incompatible with analyzer 8.x

[codaMW]

Environment

• Flutter: 3.44.0 (channel stable)
• Dart SDK: 3.12.0
• OS: Ubuntu 24.04 (WSL2)

Steps to Reproduce

git clone https://github.com/MostroP2P/mobile.git
cd mobile
flutter pub get
dart run build_runner build -d

Error

W source_gen-3.1.0/lib/src/constants/revive.dart:82:40: Error: The method
  'getInvocation' isn't defined for the type 'DartObjectImpl'.
   - 'DartObjectImpl' is from 'package:analyzer/src/dart/constant/value.dart'
  Try correcting the name to the name of an existing method, or defining a
  method named 'getInvocation'.
    final i = (object as DartObjectImpl).getInvocation();
                                         ^^^^^^^^^^^^^
E Failed to compile build script.

Root Cause

build_runner: ^2.4.0 resolves to build_runner 2.7.1 which pulls source_gen 3.1.0. That version calls DartObjectImpl.getInvocation() which was removed in analyzer 8.x. Flutter 3.44.0 ships Dart 3.12.0 which forces analyzer 8.4.1.

source_gen 3.2.0 does not exist on pub.dev, there is no released version of source_gen that supports analyzer >=8.0.0. Bumping build_runner or mockito constraints alone does not resolve this because the underlying source_gen package has not yet published a compatible release.

This was verified on the latest commit of main (e46854f3). Android Studio is not involved, this is pure Dart code generation and fails on a clean clone.

Impact

dart run build_runner build -d is a required setup step per the README. This blocks all contributors on Flutter stable 3.44.0 from building the app locally.

Possible Fix

Once source_gen publishes a release supporting analyzer 8.x, bumping build_runner and mockito to their latest versions should resolve this. Alternatively, replacing mockito with a code generation approach that does not depend on source_gen 3.x would also fix it. This is related to the broader dependency modernisation tracked in #512.