code: function mountComponentIntoNode(
      componentInstance,
      rootID,
      container,
      transaction,
      shouldReuseMarkup) {
    var markup = ReactReconciler.mountComponent(
      componentInstance, rootID, transaction, emptyObject
    );
    componentInstance._isTopLevel = true;
    ReactMount._mountImageIntoNode(markup, container, shouldReuseMarkup);
  }
docs: Mounts this component and inserts it into the DOM.
  
  @param {ReactComponent} componentInstance The instance to mount.
  @param {string} rootID DOM ID of the root node.
  @param {DOMElement} container DOM element to mount into.
  @param {ReactReconcileTransaction} transaction
  @param {boolean} shouldReuseMarkup If true, do not insert markup