hunk.code_window:       return this;
       }
       const newMap = this._map.__ensureOwner(ownerID);
       if (!ownerID) {
         if (this.size === 0) {
           return emptySet();
         }
         this.__ownerID = ownerID;
         this._map = newMap;
         return this;
       }
  
hunk.labels: keep keep keep keep keep replace keep keep keep keep keep
hunk.after_edit:         return this.__empty();
  
hunk.file_path: src/Set.js
hunk.type: replace
file: /**
   * Copyright (c) 2014-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */
  
  import { Seq } from '../../';
  
  {  // #constructor
  
    // $ExpectType Indexed<number>
    Seq([ 1, 2, 3 ]);
  }
  
  {  // #size
  
    // $ExpectType number | undefined
    Seq().size;
  
    // $ExpectError
    Seq().size = 10;
  }
  