Function precacheFiberNode

docs/external/js/react-dom.development.js:7942–7944

(hostInst, node)

  var internalEventHandlersKey = '__reactEventHandlers$' + randomKey;
  var internalContainerInstanceKey = '__reactContainere$' + randomKey;
  function precacheFiberNode(hostInst, node) {
    node[internalInstanceKey] = hostInst;
  }
  function markContainerAsRoot(hostRoot, node) {
    node[internalContainerInstanceKey] = hostRoot;
  }