anchor.diff:  // Use of this source code is governed by a BSD-style license that can be
   // found in the LICENSE file.
   
  -// @dart=2.9
  +// ignore_for_file: import_of_legacy_library_into_null_safe
   
   @JS()
   library gtags;
  
positive.code: @anonymous
  class GtagEvent {
    external factory GtagEvent({
      String event_category,
      String event_label, // Event e.g., gaScreenViewEvent, gaSelectEvent, etc.
      String send_to, // UA ID of target GA property to receive event data.
  
      int value,
      bool non_interaction,
      dynamic custom_map,
    });
  
  
negative.code: @anonymous
  class GtagException {
    external factory GtagException({
      String? description,
      bool fatal = false,
    });
  
    external String get description; // Description of the error.
  