>>>
class Bar {
  void foo() {
    blah.method(someLongArgument, andAnotherOne, andAThirdOne, andOneMore)
      .then((var x) {
        var y = x * 2;
      });
  }
}
<<<
class Bar {
  void foo() {
    blah
        .method(someLongArgument, andAnotherOne, andAThirdOne, andOneMore)
        .then((var x) {
      var y = x * 2;
    });
  }
}