Revert "Rename internal fields (#18377)"

This reverts commit 2ba43ed.

Author: gaearon

packages/react-dom/src/client/ReactDOMComponentTree.js

@@ -30,10 +30,10 @@ import {getParentSuspenseInstance} from './ReactDOMHostConfig';
 const randomKey = Math.random()
   .toString(36)
   .slice(2);
-const internalInstanceKey = '__reactFiber$' + randomKey;
-const internalEventHandlersKey = '__reactEvents$' + randomKey;
-const internalContainerInstanceKey = '__reactContainer$' + randomKey;
-const internalEventListenersKey = '__reactListeners$' + randomKey;
+const internalInstanceKey = '__reactInternalInstance$' + randomKey;
+const internalEventHandlersKey = '__reactEventHandlers$' + randomKey;
+const internalContainerInstanceKey = '__reactContainere$' + randomKey;
+const internalEventListenersKey = '__reactEventListeners$' + randomKey;
 
 export function precacheFiberNode(
   hostInst: Fiber,

packages/shared/ReactInstanceMap.js

@@ -21,17 +21,17 @@
  * supported we can rename it.
  */
 export function remove(key) {
-  key._reactInternals = undefined;
+  key._reactInternalFiber = undefined;
 }
 
 export function get(key) {
-  return key._reactInternals;
+  return key._reactInternalFiber;
 }
 
 export function has(key) {
-  return key._reactInternals !== undefined;
+  return key._reactInternalFiber !== undefined;
 }
 
 export function set(key, value) {
-  key._reactInternals = value;
+  key._reactInternalFiber = value;
 }