build_runner showing error The getter 'macroKeyword' isn't defined for the class 'ClassDeclaration'

Question

When I am running build_runner command it is showing me following error:

Failed to build build_runner:build_runner:
../../.pub-cache/hosted/pub.dev/dart_style-2.3.5/lib/src/front_end/ast_node_visitor.dart:251:16: Error: The getter 'macroKeyword' isn't defined for the class 'ClassDeclaration'.
  - 'ClassDeclaration' is from 'package:analyzer/src/dart/ast/ast.dart' ('../../.pub-cache/hosted/pub.dev/analyzer-6.2.0/lib/src/dart/ast/ast.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'macroKeyword'.
          node.macroKeyword,
                ^^^^^^^^^^^^
../../.pub-cache/hosted/pub.dev/dart_style-2.3.5/lib/src/source_visitor.dart:595:19: Error: The getter 'macroKeyword' isn't defined for the class 'ClassDeclaration'.
  - 'ClassDeclaration' is from 'package:analyzer/src/dart/ast/ast.dart' ('../../.pub-cache/hosted/pub.dev/analyzer-6.2.0/lib/src/dart/ast/ast.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'macroKeyword'.
    modifier(node.macroKeyword);
                  ^^^^^^^^^^^^

Answer 1

Add analyzer: ^5.11.1 to your dev_dependencies and run the following:

flutter clean

flutter pub get

dart run build_runner build

Note: If the analyzer version 5.11.1 doesn't work for you, try changing the version and it will work. You can check for the version here https://pub.dev/packages/analyzer/changelog

Answer 2

You don't have to lower analyzer version. It does not make any sense.

dart_style library was updated to version 2.3.5.

just lower version dart_style to 2.3.4

Add dart_style: 2.3.4 to your dev_dependencies and run:

flutter clean
flutter pub get
flutter pub run build_runner ...

Answer 3

It was failing on CI and working fine on local. Updating to the latest version 3.19.2 on CI worked and resolve this issue.

Answer 4

I occurred the same issue, and I set dart_style to 2.3.4 then solved it

Answer 5

TL;DR: Upgrade your packages again and you should get a fixed dart_style.

Hi, it's me. I'm the problem.

A while back, I added support to dart_style for formatting (currently experimental) code using the upcoming macro keyword. When I did that, I forgot to update the analyzer constraint to ensure that dart_style only uses versions of the analyzer that have ClassDeclaration.macroKeyword in its public API.

Then I published dart_style 2.3.5 yesterday with that use of macroKeyword and the bad analyzer constraint. Oops. :(

I just published a new 2.3.6 version of dart_style which has the same analyzer constraint but doesn't have a compile error on macroKeyword. Since it uses the same analyzer constraint, anyone on the old broken 2.3.5 version of dart_style should be able to upgrade to the fixed version by running dart pub upgrade (or flutter pub ugprade or however else you generally upgrade your packages).

Sorry for the pain.