old_contents: var React = require('react');
  var React = require('react-dom');
  
  var ButtonManagerMixin = {
      iconsProviderName: null,
  
      setIconsProvider: function(name) {
        this.iconsProviderName = name;
      },
  
      getBoldButton: function() {
  
      },
  
      getItalicButton: function() {
  
      },
  
      getHeaderButton: function() {
  
      },
  
      getSubHeaderButton: function() {
  
      },
  
      getMakeListButton: function() {
  
      },
  
      getImageButton: function() {
  
      },
  
      getLinkButton: function() {
        
      }
  }
  
  module.exports = CSSIconsProviderMixin;
  
new_contents: var React = require('react');
  var React = require('react-dom');
  
  var ButtonManagerMixin = {
      iconsProviderName: null,
  
      setIconsProvider: function(name) {
        this.iconsProviderName = name;
      },
  
      getBoldButton: function() {
  
      },
  
      getItalicButton: function() {
  
      },
  
      getHeaderButton: function() {
  
      },
  
      getSubHeaderButton: function() {
  
      },
  
      getMakeListButton: function() {
  
      },
  
      getImageButton: function() {
  
      },
  
      getLinkButton: function() {
  
      }
  }
  
  module.exports = ButtonManagerMixin;
  
subject: fix name exported variable