The annotation 'visibleOutsideTemplate' can only be applied to a member of a class, enum, or mixin that is annotated with 'visibleForTemplate'DRT-W1450

The analyzer produces this diagnostic when the @visibleOutsideTemplate annotation is used incorrectly. This annotation is only meant to annotate members of a class, enum, or mixin that has the @visibleForTemplate annotation, to opt those members out of the visibility restrictions that @visibleForTemplate imposes.

Examples

The following code produces this diagnostic because there is no @visibleForTemplate annotation at the class level:

import 'package:angular_meta/angular_meta.dart';

class C {
  @visibleOutsideTemplate
  int m() {
    return 1;
  }
}

The following code produces this diagnostic because the annotation is on a class declaration, not a member of a class, enum, or mixin:

import 'package:angular_meta/angular_meta.dart';

@visibleOutsideTemplate
class C {}

Common fixes

If the class is only visible so that templates can reference it, then add the @visibleForTemplate annotation to the class:

import 'package:angular_meta/angular_meta.dart';

@visibleForTemplate
class C {
  @visibleOutsideTemplate
  int m() {
    return 1;
  }
}

If the @visibleOutsideTemplate annotation is on anything other than a member of a class, enum, or mixin with the @visibleForTemplate annotation, remove the annotation:

class C {}