build.yaml

targets:
  $default:
    builders:
      version_gen:
        enabled: true

builders:
  version_gen:
    import: "package:version_gen/version_gen.dart"
    builder_factories: [ "build" ]
    build_extensions: { "$lib$": [ "version.gen.dart" ] }
    auto_apply: root_package
    build_to: source