**Do you want to request a *feature* or report a *bug*?**

Bug

**What is the current behavior?**

React Native for Web was broken by 16.5 as describe [here](https://github.com/necolas/react-native-web/issues/1096) due to this change https://github.com/facebook/react/pull/13539

**What is the expected behavior?**

Release a version of React that exports the EventPluginHub.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

Worked in 16.4
/**
   * Finds all instance of components in the rendered tree that are DOM
   * components with the class name matching `className`.
   * @return {array} an array of all the matches.
   */
  scryRenderedDOMComponentsWithClass: function(root, classNames) {
    validateClassInstance(root, 'scryRenderedDOMComponentsWithClass');
    return ReactTestUtils.findAllInRenderedTree(root, function(inst) {
      if (ReactTestUtils.isDOMComponent(inst)) {
        let className = inst.className;
        if (typeof className !== 'string') {
          
          className = inst.getAttribute('class') || '';
        }
        const classList = className.split(/\s+/);
        if (!Array.isArray(classNames)) {
          invariant(
            classNames !== undefined,
            'TestUtils.scryRenderedDOMComponentsWithClass expects a ' +
              'className as a second argument.',
          );
          classNames = classNames.split(/\s+/);
        }
        return classNames.every(function(name) {
          return classList.indexOf(name) !== -1;
        });
      }
      return false;
    });
  },