old_contents: "use strict";
  
  function removeContainer(container, onResultCallback) {
    let options = {
      "v": true,
      "force": true
    };
  
    container.remove(options, onResultCallback || () => { });
  }
  
  function removeContainers(containers) {
    containers.forEach(container => {
      removeContainer(container);
    });
  }
  
  exports.removeContainer =
    removeContainer;
  exports.removeContainers =
    removeContainers;
  
new_contents: "use strict";
  
  function removeContainer(container, onResultCallback) {
    let options = {
      "v": true,
      "force": true
    };
  
    let dummy =
      () => { };
  
    container.remove(options, onResultCallback || dummy);
  }
  
  function removeContainers(containers) {
    containers.forEach(container => {
      removeContainer(container);
    });
  }
  
  exports.removeContainer =
    removeContainer;
  exports.removeContainers =
    removeContainers;
  
subject: Add support for Node.js 6