From 487d6d977d6f37b48e4ca89db17b2456c3b4e566 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Markb=C3=A5ge?= <sebastian@calyptus.eu>
Date: Tue, 9 Apr 2024 12:20:22 -0400
Subject: [PATCH] Rename SECRET INTERNALS to
 `__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE` (#28789)

Follow up to #28783 and #28786.

Since we've changed the implementations of these we can rename them to
something a bit more descriptive while we're at it, since anyone
depending on them will need to upgrade their code anyway.

"react" with no condition:
`__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE`
"react" with "react-server" condition:
`__SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE`
"react-dom":
`__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE`
---
 fixtures/dom/public/act-dom.html              |   2 +-
 packages/react-cache/src/ReactCacheOld.js     |   2 +-
 .../src/__tests__/legacy/editing-test.js      |  23 +-
 .../__tests__/legacy/inspectElement-test.js   | 122 ++--
 .../__tests__/legacy/storeLegacy-v15-test.js  | 651 +++++++++++-------
 .../src/devtools/cache.js                     |   2 +-
 packages/react-dom/client.js                  |   2 +-
 packages/react-dom/index.classic.fb.js        |   2 +-
 packages/react-dom/index.experimental.js      |   2 +-
 packages/react-dom/index.js                   |   2 +-
 packages/react-dom/index.modern.fb.js         |   2 +-
 packages/react-dom/index.stable.js            |   2 +-
 packages/react-dom/npm/client.js              |   2 +-
 packages/react-dom/server-rendering-stub.js   |   2 +-
 packages/react-dom/src/ReactDOMServer.js      |   2 +-
 .../__tests__/ReactCompositeComponent-test.js |   2 +-
 .../react-dom/src/__tests__/ReactDOM-test.js  |   3 +-
 .../src/__tests__/ReactDOMComponent-test.js   |   2 +-
 .../__tests__/ReactDOMEventListener-test.js   |   4 +-
 .../src/__tests__/ReactDOMLegacyFiber-test.js |  12 +-
 .../ReactDOMServerIntegrationHooks-test.js    |   2 +-
 ...eactDOMServerIntegrationNewContext-test.js |   3 +-
 .../ReactDOMSuspensePlaceholder-test.js       |   3 +-
 .../src/__tests__/ReactEmptyComponent-test.js |   3 +-
 .../ReactLegacyCompositeComponent-test.js     |   3 +-
 .../src/__tests__/ReactLegacyUpdates-test.js  |   3 +-
 .../__tests__/ReactServerRendering-test.js    |   2 +-
 .../src/__tests__/ReactUpdates-test.js        |   3 +-
 .../react-dom-server-rendering-stub-test.js   |   3 +-
 .../src/test-utils/ReactTestUtilsFB.js        |   2 +-
 .../react-dom/unstable_testing.classic.fb.js  |   2 +-
 .../unstable_testing.experimental.js          |   2 +-
 .../react-dom/unstable_testing.modern.fb.js   |   2 +-
 packages/react-dom/unstable_testing.stable.js |   2 +-
 .../src/__tests__/ReactHooks-test.internal.js |  16 +-
 .../src/__tests__/ReactMemo-test.js           |   4 +-
 .../src/__tests__/ReactNewContext-test.js     |   2 +-
 .../src/ReactSharedInternalsServer.js         |   2 +-
 packages/react/index.classic.fb.js            |   2 +-
 packages/react/index.experimental.js          |   2 +-
 packages/react/index.js                       |   2 +-
 packages/react/index.modern.fb.js             |   2 +-
 packages/react/index.stable.js                |   2 +-
 packages/react/src/ReactClient.js             |   2 +-
 .../react/src/ReactServer.experimental.js     |   2 +-
 packages/react/src/ReactServer.js             |   2 +-
 .../npm/umd/scheduler.development.js          |  44 +-
 .../npm/umd/scheduler.production.min.js       |  40 +-
 .../npm/umd/scheduler.profiling.min.js        |  40 +-
 packages/shared/ReactDOMSharedInternals.js    |   2 +-
 packages/shared/ReactSharedInternals.js       |   2 +-
 packages/shared/forks/Scheduler.umd.js        |   3 +-
 .../shared/forks/consoleWithStackDev.www.js   |   2 +-
 .../ReactBrowserEventEmitter_DO_NOT_USE.js    |   4 +-
 54 files changed, 607 insertions(+), 448 deletions(-)

diff --git a/fixtures/dom/public/act-dom.html b/fixtures/dom/public/act-dom.html
index 2aa33da465e26..504a480bfdbcd 100644
--- a/fixtures/dom/public/act-dom.html
+++ b/fixtures/dom/public/act-dom.html
@@ -10,7 +10,7 @@
     <script src="scheduler-unstable_mock.development.js"></script>
     <script src="react.development.js"></script>
     <script type="text/javascript">
-      window.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler =
+      window.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler =
         window.SchedulerMock;
     </script>
     <script src="react-dom.development.js"></script>
diff --git a/packages/react-cache/src/ReactCacheOld.js b/packages/react-cache/src/ReactCacheOld.js
index 78d8403afd0f6..7ea17286679d4 100644
--- a/packages/react-cache/src/ReactCacheOld.js
+++ b/packages/react-cache/src/ReactCacheOld.js
@@ -45,7 +45,7 @@ const Resolved = 1;
 const Rejected = 2;
 
 const SharedInternals =
-  React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
 function readContext(Context: ReactContext<mixed>) {
   const dispatcher = SharedInternals.H;
diff --git a/packages/react-devtools-shared/src/__tests__/legacy/editing-test.js b/packages/react-devtools-shared/src/__tests__/legacy/editing-test.js
index ec02e33f76433..c6da4b5eccdb3 100644
--- a/packages/react-devtools-shared/src/__tests__/legacy/editing-test.js
+++ b/packages/react-devtools-shared/src/__tests__/legacy/editing-test.js
@@ -64,11 +64,11 @@ describe('editing interface', () => {
 
       act(() =>
         ReactDOM.render(
-          <ClassComponent
-            array={[1, 2, 3]}
-            object={{nested: 'initial'}}
-            shallow="initial"
-          />,
+          React.createElement(ClassComponent, {
+            array: [1, 2, 3],
+            object: {nested: 'initial'},
+            shallow: 'initial',
+          }),
           document.createElement('div'),
         ),
       );
@@ -270,7 +270,10 @@ describe('editing interface', () => {
 
       act(() =>
         ReactDOM.render(
-          <ClassComponent object={{nested: 'initial'}} shallow="initial" />,
+          React.createElement(ClassComponent, {
+            object: {nested: 'initial'},
+            shallow: 'initial',
+          }),
           document.createElement('div'),
         ),
       );
@@ -489,9 +492,11 @@ describe('editing interface', () => {
 
       act(() =>
         ReactDOM.render(
-          <LegacyContextProvider>
-            <ClassComponent />
-          </LegacyContextProvider>,
+          React.createElement(
+            LegacyContextProvider,
+            null,
+            React.createElement(ClassComponent),
+          ),
           document.createElement('div'),
         ),
       );
diff --git a/packages/react-devtools-shared/src/__tests__/legacy/inspectElement-test.js b/packages/react-devtools-shared/src/__tests__/legacy/inspectElement-test.js
index 1940e82a80f40..10a355d0430f3 100644
--- a/packages/react-devtools-shared/src/__tests__/legacy/inspectElement-test.js
+++ b/packages/react-devtools-shared/src/__tests__/legacy/inspectElement-test.js
@@ -62,7 +62,10 @@ describe('InspectedElementContext', () => {
     const Example = () => null;
 
     act(() =>
-      ReactDOM.render(<Example a={1} b="abc" />, document.createElement('div')),
+      ReactDOM.render(
+        React.createElement(Example, {a: 1, b: 'abc'}),
+        document.createElement('div'),
+      ),
     );
 
     const id = ((store.getElementIDAtIndex(0): any): number);
@@ -91,19 +94,19 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example
-          boolean_false={false}
-          boolean_true={true}
-          infinity={Infinity}
-          integer_zero={0}
-          integer_one={1}
-          float={1.23}
-          string="abc"
-          string_empty=""
-          nan={NaN}
-          value_null={null}
-          value_undefined={undefined}
-        />,
+        React.createElement(Example, {
+          boolean_false: false,
+          boolean_true: true,
+          infinity: Infinity,
+          integer_zero: 0,
+          integer_one: 1,
+          float: 1.23,
+          string: 'abc',
+          string_empty: '',
+          nan: NaN,
+          value_null: null,
+          value_undefined: undefined,
+        }),
         document.createElement('div'),
       ),
     );
@@ -178,28 +181,28 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example
-          anonymous_fn={instance.anonymousFunction}
-          array_buffer={arrayBuffer}
-          array_of_arrays={arrayOfArrays}
+        React.createElement(Example, {
+          anonymous_fn: instance.anonymousFunction,
+          array_buffer: arrayBuffer,
+          array_of_arrays: arrayOfArrays,
           // eslint-disable-next-line no-undef
-          big_int={BigInt(123)}
-          bound_fn={exampleFunction.bind(this)}
-          data_view={dataView}
-          date={new Date(123)}
-          fn={exampleFunction}
-          html_element={div}
-          immutable={immutableMap}
-          map={mapShallow}
-          map_of_maps={mapOfMaps}
-          object_of_objects={objectOfObjects}
-          react_element={<span />}
-          regexp={/abc/giu}
-          set={setShallow}
-          set_of_sets={setOfSets}
-          symbol={Symbol('symbol')}
-          typed_array={typedArray}
-        />,
+          big_int: BigInt(123),
+          bound_fn: exampleFunction.bind(this),
+          data_view: dataView,
+          date: new Date(123),
+          fn: exampleFunction,
+          html_element: div,
+          immutable: immutableMap,
+          map: mapShallow,
+          map_of_maps: mapOfMaps,
+          object_of_objects: objectOfObjects,
+          react_element: React.createElement('span'),
+          regexp: /abc/giu,
+          set: setShallow,
+          set_of_sets: setOfSets,
+          symbol: Symbol('symbol'),
+          typed_array: typedArray,
+        }),
         document.createElement('div'),
       ),
     );
@@ -333,7 +336,7 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example object={object} />,
+        React.createElement(Example, {object}),
         document.createElement('div'),
       ),
     );
@@ -363,7 +366,7 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example object={object} />,
+        React.createElement(Example, {object}),
         document.createElement('div'),
       ),
     );
@@ -390,7 +393,7 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example iteratable={iteratable} />,
+        React.createElement(Example, {iteratable}),
         document.createElement('div'),
       ),
     );
@@ -445,7 +448,7 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example data={new CustomData()} />,
+        React.createElement(Example, {data: new CustomData()}),
         document.createElement('div'),
       ),
     );
@@ -537,7 +540,10 @@ describe('InspectedElementContext', () => {
     });
 
     act(() =>
-      ReactDOM.render(<Example data={object} />, document.createElement('div')),
+      ReactDOM.render(
+        React.createElement(Example, {data: object}),
+        document.createElement('div'),
+      ),
     );
 
     const id = ((store.getElementIDAtIndex(0): any): number);
@@ -605,7 +611,7 @@ describe('InspectedElementContext', () => {
     const Example = ({data}) => null;
     act(() =>
       ReactDOM.render(
-        <Example data={testData} />,
+        React.createElement(Example, {data: testData}),
         document.createElement('div'),
       ),
     );
@@ -631,8 +637,8 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example
-          nestedObject={{
+        React.createElement(Example, {
+          nestedObject: {
             a: {
               b: {
                 c: [
@@ -644,8 +650,8 @@ describe('InspectedElementContext', () => {
                 ],
               },
             },
-          }}
-        />,
+          },
+        }),
         document.createElement('div'),
       ),
     );
@@ -746,7 +752,7 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example nestedObject={nestedObject} />,
+        React.createElement(Example, {nestedObject}),
         document.createElement('div'),
       ),
     );
@@ -802,7 +808,7 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example nestedObject={nestedObject} />,
+        React.createElement(Example, {nestedObject}),
         document.createElement('div'),
       ),
     );
@@ -872,17 +878,17 @@ describe('InspectedElementContext', () => {
 
     act(() =>
       ReactDOM.render(
-        <Example
-          arrayBuffer={arrayBuffer}
-          dataView={dataView}
-          map={map}
-          set={set}
-          mapOfMaps={mapOfMaps}
-          setOfSets={setOfSets}
-          typedArray={typedArray}
-          immutable={immutable}
-          bigInt={bigInt}
-        />,
+        React.createElement(Example, {
+          arrayBuffer: arrayBuffer,
+          dataView: dataView,
+          map: map,
+          set: set,
+          mapOfMaps: mapOfMaps,
+          setOfSets: setOfSets,
+          typedArray: typedArray,
+          immutable: immutable,
+          bigInt: bigInt,
+        }),
         document.createElement('div'),
       ),
     );
diff --git a/packages/react-devtools-shared/src/__tests__/legacy/storeLegacy-v15-test.js b/packages/react-devtools-shared/src/__tests__/legacy/storeLegacy-v15-test.js
index 3c24be0093d63..f912638fb508e 100644
--- a/packages/react-devtools-shared/src/__tests__/legacy/storeLegacy-v15-test.js
+++ b/packages/react-devtools-shared/src/__tests__/legacy/storeLegacy-v15-test.js
@@ -11,13 +11,10 @@ describe('Store (legacy)', () => {
   let React;
   let ReactDOM;
   let store;
-
   const act = (callback: Function) => {
     callback();
-
     jest.runAllTimers(); // Flush Bridge operations
   };
-
   beforeEach(() => {
     store = global.store;
 
@@ -27,56 +24,66 @@ describe('Store (legacy)', () => {
     jest.mock('react-dom', () =>
       jest.requireActual('react-dom-15/dist/react-dom.js'),
     );
-
     React = require('react');
     ReactDOM = require('react-dom');
   });
-
   it('should not allow a root node to be collapsed', () => {
-    const Component = () => <div>Hi</div>;
-
+    const Component = () => React.createElement('div', null, 'Hi');
     act(() =>
-      ReactDOM.render(<Component count={4} />, document.createElement('div')),
+      ReactDOM.render(
+        React.createElement(Component, {
+          count: 4,
+        }),
+        document.createElement('div'),
+      ),
     );
     expect(store).toMatchInlineSnapshot(`
       [root]
         ▾ <Component>
             <div>
     `);
-
     expect(store.roots).toHaveLength(1);
-
     const rootID = store.roots[0];
-
     expect(() => store.toggleIsCollapsed(rootID, true)).toThrow(
       'Root nodes cannot be collapsed',
     );
   });
-
   describe('collapseNodesByDefault:false', () => {
     beforeEach(() => {
       store.collapseNodesByDefault = false;
     });
-
     it('should support mount and update operations', () => {
-      const Grandparent = ({count}) => (
-        <div>
-          <Parent count={count} />
-          <Parent count={count} />
-        </div>
-      );
-      const Parent = ({count}) => (
-        <div>
-          {new Array(count).fill(true).map((_, index) => (
-            <Child key={index} />
-          ))}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
-
+      const Grandparent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          React.createElement(Parent, {
+            count: count,
+          }),
+          React.createElement(Parent, {
+            count: count,
+          }),
+        );
+      const Parent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          new Array(count).fill(true).map((_, index) =>
+            React.createElement(Child, {
+              key: index,
+            }),
+          ),
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       const container = document.createElement('div');
-
-      act(() => ReactDOM.render(<Grandparent count={4} />, container));
+      act(() =>
+        ReactDOM.render(
+          React.createElement(Grandparent, {
+            count: 4,
+          }),
+          container,
+        ),
+      );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Grandparent>
@@ -102,8 +109,14 @@ describe('Store (legacy)', () => {
                   ▾ <Child key="3">
                       <div>
       `);
-
-      act(() => ReactDOM.render(<Grandparent count={2} />, container));
+      act(() =>
+        ReactDOM.render(
+          React.createElement(Grandparent, {
+            count: 2,
+          }),
+          container,
+        ),
+      );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Grandparent>
@@ -121,27 +134,38 @@ describe('Store (legacy)', () => {
                   ▾ <Child key="1">
                       <div>
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(container));
       expect(store).toMatchInlineSnapshot(``);
     });
-
     it('should support mount and update operations for multiple roots', () => {
-      const Parent = ({count}) => (
-        <div>
-          {new Array(count).fill(true).map((_, index) => (
-            <Child key={index} />
-          ))}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
-
+      const Parent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          new Array(count).fill(true).map((_, index) =>
+            React.createElement(Child, {
+              key: index,
+            }),
+          ),
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       const containerA = document.createElement('div');
       const containerB = document.createElement('div');
-
       act(() => {
-        ReactDOM.render(<Parent key="A" count={3} />, containerA);
-        ReactDOM.render(<Parent key="B" count={2} />, containerB);
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'A',
+            count: 3,
+          }),
+          containerA,
+        );
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'B',
+            count: 2,
+          }),
+          containerB,
+        );
       });
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -161,10 +185,21 @@ describe('Store (legacy)', () => {
               ▾ <Child key="1">
                   <div>
       `);
-
       act(() => {
-        ReactDOM.render(<Parent key="A" count={4} />, containerA);
-        ReactDOM.render(<Parent key="B" count={1} />, containerB);
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'A',
+            count: 4,
+          }),
+          containerA,
+        );
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'B',
+            count: 1,
+          }),
+          containerB,
+        );
       });
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -184,7 +219,6 @@ describe('Store (legacy)', () => {
               ▾ <Child key="0">
                   <div>
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(containerB));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -199,35 +233,46 @@ describe('Store (legacy)', () => {
               ▾ <Child key="3">
                   <div>
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(containerA));
       expect(store).toMatchInlineSnapshot(``);
     });
-
     it('should not filter DOM nodes from the store tree', () => {
-      const Grandparent = ({flip}) => (
-        <div>
-          <div>
-            <Parent flip={flip} />
-          </div>
-          <Parent flip={flip} />
-          <Nothing />
-        </div>
-      );
-      const Parent = ({flip}) => (
-        <div>
-          {flip ? 'foo' : null}
-          <Child />
-          {flip && [null, 'hello', 42]}
-          {flip ? 'bar' : 'baz'}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
+      const Grandparent = ({flip}) =>
+        React.createElement(
+          'div',
+          null,
+          React.createElement(
+            'div',
+            null,
+            React.createElement(Parent, {
+              flip: flip,
+            }),
+          ),
+          React.createElement(Parent, {
+            flip: flip,
+          }),
+          React.createElement(Nothing, null),
+        );
+      const Parent = ({flip}) =>
+        React.createElement(
+          'div',
+          null,
+          flip ? 'foo' : null,
+          React.createElement(Child, null),
+          flip && [null, 'hello', 42],
+          flip ? 'bar' : 'baz',
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       const Nothing = () => null;
-
       const container = document.createElement('div');
       act(() =>
-        ReactDOM.render(<Grandparent count={4} flip={false} />, container),
+        ReactDOM.render(
+          React.createElement(Grandparent, {
+            count: 4,
+            flip: false,
+          }),
+          container,
+        ),
       );
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -244,9 +289,14 @@ describe('Store (legacy)', () => {
                       <div>
                 <Nothing>
       `);
-
       act(() =>
-        ReactDOM.render(<Grandparent count={4} flip={true} />, container),
+        ReactDOM.render(
+          React.createElement(Grandparent, {
+            count: 4,
+            flip: true,
+          }),
+          container,
+        ),
       );
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -263,30 +313,37 @@ describe('Store (legacy)', () => {
                       <div>
                 <Nothing>
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(container));
       expect(store).toMatchInlineSnapshot(``);
     });
-
     it('should support collapsing parts of the tree', () => {
-      const Grandparent = ({count}) => (
-        <div>
-          <Parent count={count} />
-          <Parent count={count} />
-        </div>
-      );
-      const Parent = ({count}) => (
-        <div>
-          {new Array(count).fill(true).map((_, index) => (
-            <Child key={index} />
-          ))}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
-
+      const Grandparent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          React.createElement(Parent, {
+            count: count,
+          }),
+          React.createElement(Parent, {
+            count: count,
+          }),
+        );
+      const Parent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          new Array(count).fill(true).map((_, index) =>
+            React.createElement(Child, {
+              key: index,
+            }),
+          ),
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       act(() =>
         ReactDOM.render(
-          <Grandparent count={2} />,
+          React.createElement(Grandparent, {
+            count: 2,
+          }),
           document.createElement('div'),
         ),
       );
@@ -307,11 +364,9 @@ describe('Store (legacy)', () => {
                   ▾ <Child key="1">
                       <div>
       `);
-
       const grandparentID = store.getElementIDAtIndex(0);
       const parentOneID = store.getElementIDAtIndex(2);
       const parentTwoID = store.getElementIDAtIndex(8);
-
       act(() => store.toggleIsCollapsed(parentOneID, true));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -325,7 +380,6 @@ describe('Store (legacy)', () => {
                   ▾ <Child key="1">
                       <div>
       `);
-
       act(() => store.toggleIsCollapsed(parentTwoID, true));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -334,7 +388,6 @@ describe('Store (legacy)', () => {
               ▸ <Parent>
               ▸ <Parent>
       `);
-
       act(() => store.toggleIsCollapsed(parentOneID, false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -348,13 +401,11 @@ describe('Store (legacy)', () => {
                       <div>
               ▸ <Parent>
       `);
-
       act(() => store.toggleIsCollapsed(grandparentID, true));
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Grandparent>
       `);
-
       act(() => store.toggleIsCollapsed(grandparentID, false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -369,18 +420,19 @@ describe('Store (legacy)', () => {
               ▸ <Parent>
       `);
     });
-
     it('should support adding and removing children', () => {
-      const Root = ({children}) => <div>{children}</div>;
-      const Component = () => <div />;
-
+      const Root = ({children}) => React.createElement('div', null, children);
+      const Component = () => React.createElement('div', null);
       const container = document.createElement('div');
-
       act(() =>
         ReactDOM.render(
-          <Root>
-            <Component key="a" />
-          </Root>,
+          React.createElement(
+            Root,
+            null,
+            React.createElement(Component, {
+              key: 'a',
+            }),
+          ),
           container,
         ),
       );
@@ -391,13 +443,18 @@ describe('Store (legacy)', () => {
               ▾ <Component key="a">
                   <div>
       `);
-
       act(() =>
         ReactDOM.render(
-          <Root>
-            <Component key="a" />
-            <Component key="b" />
-          </Root>,
+          React.createElement(
+            Root,
+            null,
+            React.createElement(Component, {
+              key: 'a',
+            }),
+            React.createElement(Component, {
+              key: 'b',
+            }),
+          ),
           container,
         ),
       );
@@ -410,12 +467,15 @@ describe('Store (legacy)', () => {
               ▾ <Component key="b">
                   <div>
       `);
-
       act(() =>
         ReactDOM.render(
-          <Root>
-            <Component key="b" />
-          </Root>,
+          React.createElement(
+            Root,
+            null,
+            React.createElement(Component, {
+              key: 'b',
+            }),
+          ),
           container,
         ),
       );
@@ -427,21 +487,34 @@ describe('Store (legacy)', () => {
                   <div>
       `);
     });
-
     it('should support reordering of children', () => {
-      const Root = ({children}) => <div>{children}</div>;
-      const Component = () => <div />;
-
-      const Foo = () => <div>{[<Component key="0" />]}</div>;
-      const Bar = () => (
-        <div>{[<Component key="0" />, <Component key="1" />]}</div>
-      );
-      const foo = <Foo key="foo" />;
-      const bar = <Bar key="bar" />;
-
+      const Root = ({children}) => React.createElement('div', null, children);
+      const Component = () => React.createElement('div', null);
+      const Foo = () =>
+        React.createElement('div', null, [
+          React.createElement(Component, {
+            key: '0',
+          }),
+        ]);
+      const Bar = () =>
+        React.createElement('div', null, [
+          React.createElement(Component, {
+            key: '0',
+          }),
+          React.createElement(Component, {
+            key: '1',
+          }),
+        ]);
+      const foo = React.createElement(Foo, {
+        key: 'foo',
+      });
+      const bar = React.createElement(Bar, {
+        key: 'bar',
+      });
       const container = document.createElement('div');
-
-      act(() => ReactDOM.render(<Root>{[foo, bar]}</Root>, container));
+      act(() =>
+        ReactDOM.render(React.createElement(Root, null, [foo, bar]), container),
+      );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Root>
@@ -457,8 +530,9 @@ describe('Store (legacy)', () => {
                   ▾ <Component key="1">
                       <div>
       `);
-
-      act(() => ReactDOM.render(<Root>{[bar, foo]}</Root>, container));
+      act(() =>
+        ReactDOM.render(React.createElement(Root, null, [bar, foo]), container),
+      );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Root>
@@ -474,13 +548,11 @@ describe('Store (legacy)', () => {
                   ▾ <Component key="0">
                       <div>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(0), true));
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Root>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(0), false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -499,30 +571,35 @@ describe('Store (legacy)', () => {
       `);
     });
   });
-
   describe('collapseNodesByDefault:true', () => {
     beforeEach(() => {
       store.collapseNodesByDefault = true;
     });
-
     it('should support mount and update operations', () => {
-      const Parent = ({count}) => (
-        <div>
-          {new Array(count).fill(true).map((_, index) => (
-            <Child key={index} />
-          ))}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
-
+      const Parent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          new Array(count).fill(true).map((_, index) =>
+            React.createElement(Child, {
+              key: index,
+            }),
+          ),
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       const container = document.createElement('div');
-
       act(() =>
         ReactDOM.render(
-          <div>
-            <Parent count={1} />
-            <Parent count={3} />
-          </div>,
+          React.createElement(
+            'div',
+            null,
+            React.createElement(Parent, {
+              count: 1,
+            }),
+            React.createElement(Parent, {
+              count: 3,
+            }),
+          ),
           container,
         ),
       );
@@ -530,13 +607,18 @@ describe('Store (legacy)', () => {
         [root]
           ▸ <div>
       `);
-
       act(() =>
         ReactDOM.render(
-          <div>
-            <Parent count={2} />
-            <Parent count={1} />
-          </div>,
+          React.createElement(
+            'div',
+            null,
+            React.createElement(Parent, {
+              count: 2,
+            }),
+            React.createElement(Parent, {
+              count: 1,
+            }),
+          ),
           container,
         ),
       );
@@ -544,27 +626,38 @@ describe('Store (legacy)', () => {
         [root]
           ▸ <div>
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(container));
       expect(store).toMatchInlineSnapshot(``);
     });
-
     it('should support mount and update operations for multiple roots', () => {
-      const Parent = ({count}) => (
-        <div>
-          {new Array(count).fill(true).map((_, index) => (
-            <Child key={index} />
-          ))}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
-
+      const Parent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          new Array(count).fill(true).map((_, index) =>
+            React.createElement(Child, {
+              key: index,
+            }),
+          ),
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       const containerA = document.createElement('div');
       const containerB = document.createElement('div');
-
       act(() => {
-        ReactDOM.render(<Parent key="A" count={3} />, containerA);
-        ReactDOM.render(<Parent key="B" count={2} />, containerB);
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'A',
+            count: 3,
+          }),
+          containerA,
+        );
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'B',
+            count: 2,
+          }),
+          containerB,
+        );
       });
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -572,10 +665,21 @@ describe('Store (legacy)', () => {
         [root]
           ▸ <Parent key="B">
       `);
-
       act(() => {
-        ReactDOM.render(<Parent key="A" count={4} />, containerA);
-        ReactDOM.render(<Parent key="B" count={1} />, containerB);
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'A',
+            count: 4,
+          }),
+          containerA,
+        );
+        ReactDOM.render(
+          React.createElement(Parent, {
+            key: 'B',
+            count: 1,
+          }),
+          containerB,
+        );
       });
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -583,54 +687,62 @@ describe('Store (legacy)', () => {
         [root]
           ▸ <Parent key="B">
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(containerB));
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Parent key="A">
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(containerA));
       expect(store).toMatchInlineSnapshot(``);
     });
-
     it('should not filter DOM nodes from the store tree', () => {
-      const Grandparent = ({flip}) => (
-        <div>
-          <div>
-            <Parent flip={flip} />
-          </div>
-          <Parent flip={flip} />
-          <Nothing />
-        </div>
-      );
-      const Parent = ({flip}) => (
-        <div>
-          {flip ? 'foo' : null}
-          <Child />
-          {flip && [null, 'hello', 42]}
-          {flip ? 'bar' : 'baz'}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
+      const Grandparent = ({flip}) =>
+        React.createElement(
+          'div',
+          null,
+          React.createElement(
+            'div',
+            null,
+            React.createElement(Parent, {
+              flip: flip,
+            }),
+          ),
+          React.createElement(Parent, {
+            flip: flip,
+          }),
+          React.createElement(Nothing, null),
+        );
+      const Parent = ({flip}) =>
+        React.createElement(
+          'div',
+          null,
+          flip ? 'foo' : null,
+          React.createElement(Child, null),
+          flip && [null, 'hello', 42],
+          flip ? 'bar' : 'baz',
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       const Nothing = () => null;
-
       const container = document.createElement('div');
       act(() =>
-        ReactDOM.render(<Grandparent count={4} flip={false} />, container),
+        ReactDOM.render(
+          React.createElement(Grandparent, {
+            count: 4,
+            flip: false,
+          }),
+          container,
+        ),
       );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Grandparent>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(0), false));
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Grandparent>
             ▸ <div>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(1), false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -640,9 +752,14 @@ describe('Store (legacy)', () => {
               ▸ <Parent>
                 <Nothing>
       `);
-
       act(() =>
-        ReactDOM.render(<Grandparent count={4} flip={true} />, container),
+        ReactDOM.render(
+          React.createElement(Grandparent, {
+            count: 4,
+            flip: true,
+          }),
+          container,
+        ),
       );
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -652,30 +769,37 @@ describe('Store (legacy)', () => {
               ▸ <Parent>
                 <Nothing>
       `);
-
       act(() => ReactDOM.unmountComponentAtNode(container));
       expect(store).toMatchInlineSnapshot(``);
     });
-
     it('should support expanding parts of the tree', () => {
-      const Grandparent = ({count}) => (
-        <div>
-          <Parent count={count} />
-          <Parent count={count} />
-        </div>
-      );
-      const Parent = ({count}) => (
-        <div>
-          {new Array(count).fill(true).map((_, index) => (
-            <Child key={index} />
-          ))}
-        </div>
-      );
-      const Child = () => <div>Hi!</div>;
-
+      const Grandparent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          React.createElement(Parent, {
+            count: count,
+          }),
+          React.createElement(Parent, {
+            count: count,
+          }),
+        );
+      const Parent = ({count}) =>
+        React.createElement(
+          'div',
+          null,
+          new Array(count).fill(true).map((_, index) =>
+            React.createElement(Child, {
+              key: index,
+            }),
+          ),
+        );
+      const Child = () => React.createElement('div', null, 'Hi!');
       act(() =>
         ReactDOM.render(
-          <Grandparent count={2} />,
+          React.createElement(Grandparent, {
+            count: 2,
+          }),
           document.createElement('div'),
         ),
       );
@@ -683,16 +807,13 @@ describe('Store (legacy)', () => {
         [root]
           ▸ <Grandparent>
       `);
-
       const grandparentID = store.getElementIDAtIndex(0);
-
       act(() => store.toggleIsCollapsed(grandparentID, false));
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Grandparent>
             ▸ <div>
       `);
-
       const parentDivID = store.getElementIDAtIndex(1);
       act(() => store.toggleIsCollapsed(parentDivID, false));
       expect(store).toMatchInlineSnapshot(`
@@ -702,10 +823,8 @@ describe('Store (legacy)', () => {
               ▸ <Parent>
               ▸ <Parent>
       `);
-
       const parentOneID = store.getElementIDAtIndex(2);
       const parentTwoID = store.getElementIDAtIndex(3);
-
       act(() => store.toggleIsCollapsed(parentOneID, false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -715,7 +834,6 @@ describe('Store (legacy)', () => {
                 ▸ <div>
               ▸ <Parent>
       `);
-
       act(() => store.toggleIsCollapsed(parentTwoID, false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -726,7 +844,6 @@ describe('Store (legacy)', () => {
               ▾ <Parent>
                 ▸ <div>
       `);
-
       act(() => store.toggleIsCollapsed(parentOneID, true));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -736,7 +853,6 @@ describe('Store (legacy)', () => {
               ▾ <Parent>
                 ▸ <div>
       `);
-
       act(() => store.toggleIsCollapsed(parentTwoID, true));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -745,7 +861,6 @@ describe('Store (legacy)', () => {
               ▸ <Parent>
               ▸ <Parent>
       `);
-
       act(() => store.toggleIsCollapsed(grandparentID, true));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -760,24 +875,29 @@ describe('Store (legacy)', () => {
     // one can use an older transform.
     if (!require('shared/ReactFeatureFlags').enableRefAsProp) {
       it('should support expanding deep parts of the tree', () => {
-        const Wrapper = ({forwardedRef}) => (
-          <Nested depth={3} forwardedRef={forwardedRef} />
-        );
+        const Wrapper = ({forwardedRef}) =>
+          React.createElement(Nested, {
+            depth: 3,
+            forwardedRef: forwardedRef,
+          });
         const Nested = ({depth, forwardedRef}) =>
-          depth > 0 ? (
-            <Nested depth={depth - 1} forwardedRef={forwardedRef} />
-          ) : (
-            <div ref={forwardedRef} />
-          );
-
+          depth > 0
+            ? React.createElement(Nested, {
+                depth: depth - 1,
+                forwardedRef: forwardedRef,
+              })
+            : React.createElement('div', {
+                ref: forwardedRef,
+              });
         let ref = null;
         const refSetter = value => {
           ref = value;
         };
-
         act(() =>
           ReactDOM.render(
-            <Wrapper forwardedRef={refSetter} />,
+            React.createElement(Wrapper, {
+              forwardedRef: refSetter,
+            }),
             document.createElement('div'),
           ),
         );
@@ -785,9 +905,7 @@ describe('Store (legacy)', () => {
         [root]
           ▸ <Wrapper>
       `);
-
         const deepestedNodeID = global.agent.getIDForNode(ref);
-
         act(() => store.toggleIsCollapsed(deepestedNodeID, false));
         expect(store).toMatchInlineSnapshot(`
         [root]
@@ -798,15 +916,12 @@ describe('Store (legacy)', () => {
                   ▾ <Nested>
                       <div>
       `);
-
         const rootID = store.getElementIDAtIndex(0);
-
         act(() => store.toggleIsCollapsed(rootID, true));
         expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Wrapper>
       `);
-
         act(() => store.toggleIsCollapsed(rootID, false));
         expect(store).toMatchInlineSnapshot(`
         [root]
@@ -817,16 +932,13 @@ describe('Store (legacy)', () => {
                   ▾ <Nested>
                       <div>
       `);
-
         const id = store.getElementIDAtIndex(1);
-
         act(() => store.toggleIsCollapsed(id, true));
         expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Wrapper>
             ▸ <Nested>
       `);
-
         act(() => store.toggleIsCollapsed(id, false));
         expect(store).toMatchInlineSnapshot(`
         [root]
@@ -839,39 +951,51 @@ describe('Store (legacy)', () => {
       `);
       });
     }
-
     it('should support reordering of children', () => {
-      const Root = ({children}) => <div>{children}</div>;
-      const Component = () => <div />;
-
-      const Foo = () => <div>{[<Component key="0" />]}</div>;
-      const Bar = () => (
-        <div>{[<Component key="0" />, <Component key="1" />]}</div>
-      );
-      const foo = <Foo key="foo" />;
-      const bar = <Bar key="bar" />;
-
+      const Root = ({children}) => React.createElement('div', null, children);
+      const Component = () => React.createElement('div', null);
+      const Foo = () =>
+        React.createElement('div', null, [
+          React.createElement(Component, {
+            key: '0',
+          }),
+        ]);
+      const Bar = () =>
+        React.createElement('div', null, [
+          React.createElement(Component, {
+            key: '0',
+          }),
+          React.createElement(Component, {
+            key: '1',
+          }),
+        ]);
+      const foo = React.createElement(Foo, {
+        key: 'foo',
+      });
+      const bar = React.createElement(Bar, {
+        key: 'bar',
+      });
       const container = document.createElement('div');
-
-      act(() => ReactDOM.render(<Root>{[foo, bar]}</Root>, container));
+      act(() =>
+        ReactDOM.render(React.createElement(Root, null, [foo, bar]), container),
+      );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Root>
       `);
-
-      act(() => ReactDOM.render(<Root>{[bar, foo]}</Root>, container));
+      act(() =>
+        ReactDOM.render(React.createElement(Root, null, [bar, foo]), container),
+      );
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▸ <Root>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(0), false));
       expect(store).toMatchInlineSnapshot(`
         [root]
           ▾ <Root>
             ▸ <div>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(1), false));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -880,7 +1004,6 @@ describe('Store (legacy)', () => {
               ▸ <Bar key="bar">
               ▸ <Foo key="foo">
       `);
-
       act(() => {
         store.toggleIsCollapsed(store.getElementIDAtIndex(3), false);
         store.toggleIsCollapsed(store.getElementIDAtIndex(2), false);
@@ -894,7 +1017,6 @@ describe('Store (legacy)', () => {
               ▾ <Foo key="foo">
                 ▸ <div>
       `);
-
       act(() => store.toggleIsCollapsed(store.getElementIDAtIndex(0), true));
       expect(store).toMatchInlineSnapshot(`
         [root]
@@ -902,14 +1024,11 @@ describe('Store (legacy)', () => {
       `);
     });
   });
-
   describe('StrictMode compliance', () => {
     it('should mark all elements as strict mode compliant', () => {
       const App = () => null;
-
       const container = document.createElement('div');
-      act(() => ReactDOM.render(<App />, container));
-
+      act(() => ReactDOM.render(React.createElement(App, null), container));
       expect(store.getElementAtIndex(0).isStrictModeNonCompliant).toBe(false);
     });
   });
diff --git a/packages/react-devtools-shared/src/devtools/cache.js b/packages/react-devtools-shared/src/devtools/cache.js
index cae03a8877f1f..7d0cb7af03311 100644
--- a/packages/react-devtools-shared/src/devtools/cache.js
+++ b/packages/react-devtools-shared/src/devtools/cache.js
@@ -60,7 +60,7 @@ const Resolved = 1;
 const Rejected = 2;
 
 const ReactSharedInternals = (React: any)
-  .__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
 function readContext(Context: ReactContext<null>) {
   const dispatcher = ReactSharedInternals.H;
diff --git a/packages/react-dom/client.js b/packages/react-dom/client.js
index 1379aaa9d3c53..21aac9369ebb8 100644
--- a/packages/react-dom/client.js
+++ b/packages/react-dom/client.js
@@ -19,7 +19,7 @@ import type {
 import {
   createRoot as createRootImpl,
   hydrateRoot as hydrateRootImpl,
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED as Internals,
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE as Internals,
 } from './';
 
 export function createRoot(
diff --git a/packages/react-dom/index.classic.fb.js b/packages/react-dom/index.classic.fb.js
index 37a39667a86fc..a565a91f43b1f 100644
--- a/packages/react-dom/index.classic.fb.js
+++ b/packages/react-dom/index.classic.fb.js
@@ -44,4 +44,4 @@ export {
   unmountComponentAtNode,
 } from './src/client/ReactDOMRootFB';
 
-export {Internals as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED};
+export {Internals as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE};
diff --git a/packages/react-dom/index.experimental.js b/packages/react-dom/index.experimental.js
index 0d38031e60b21..f2d3c27aea0c5 100644
--- a/packages/react-dom/index.experimental.js
+++ b/packages/react-dom/index.experimental.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-export {default as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './src/ReactDOMSharedInternals';
+export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './src/ReactDOMSharedInternals';
 export {
   createPortal,
   createRoot,
diff --git a/packages/react-dom/index.js b/packages/react-dom/index.js
index 4357044d90818..50ad087dfaf6c 100644
--- a/packages/react-dom/index.js
+++ b/packages/react-dom/index.js
@@ -9,7 +9,7 @@
 
 // Export all exports so that they're available in tests.
 // We can't use export * from in Flow for some reason.
-export {default as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './src/ReactDOMSharedInternals';
+export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './src/ReactDOMSharedInternals';
 export {
   createPortal,
   createRoot,
diff --git a/packages/react-dom/index.modern.fb.js b/packages/react-dom/index.modern.fb.js
index f392b0dd9490f..0d2fa4b4dccbd 100644
--- a/packages/react-dom/index.modern.fb.js
+++ b/packages/react-dom/index.modern.fb.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-export {default as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './src/ReactDOMSharedInternalsFB';
+export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './src/ReactDOMSharedInternalsFB';
 export {
   createPortal,
   flushSync,
diff --git a/packages/react-dom/index.stable.js b/packages/react-dom/index.stable.js
index 6da13efa643cd..a9306083c0e61 100644
--- a/packages/react-dom/index.stable.js
+++ b/packages/react-dom/index.stable.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-export {default as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './src/ReactDOMSharedInternals';
+export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './src/ReactDOMSharedInternals';
 export {
   createPortal,
   createRoot,
diff --git a/packages/react-dom/npm/client.js b/packages/react-dom/npm/client.js
index bef4756404cfd..af04d9eb2ad9f 100644
--- a/packages/react-dom/npm/client.js
+++ b/packages/react-dom/npm/client.js
@@ -5,7 +5,7 @@ if (process.env.NODE_ENV === 'production') {
   exports.createRoot = m.createRoot;
   exports.hydrateRoot = m.hydrateRoot;
 } else {
-  var i = m.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  var i = m.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
   exports.createRoot = function (c, o) {
     i.usingClientEntryPoint = true;
     try {
diff --git a/packages/react-dom/server-rendering-stub.js b/packages/react-dom/server-rendering-stub.js
index db427710333a5..30f4f80e38903 100644
--- a/packages/react-dom/server-rendering-stub.js
+++ b/packages/react-dom/server-rendering-stub.js
@@ -13,7 +13,7 @@
 import ReactVersion from 'shared/ReactVersion';
 export {ReactVersion as version};
 
-export {default as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './src/ReactDOMSharedInternals';
+export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './src/ReactDOMSharedInternals';
 
 export {
   createPortal,
diff --git a/packages/react-dom/src/ReactDOMServer.js b/packages/react-dom/src/ReactDOMServer.js
index 9322ed3c1ba23..01aa77d759cfe 100644
--- a/packages/react-dom/src/ReactDOMServer.js
+++ b/packages/react-dom/src/ReactDOMServer.js
@@ -8,7 +8,7 @@
  */
 
 // This is the subset of APIs that can be accessed from Server Component modules
-export {default as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './ReactDOMSharedInternals';
+export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactDOMSharedInternals';
 export {
   prefetchDNS,
   preconnect,
diff --git a/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js b/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
index 030573a38075d..e098c93ca7a18 100644
--- a/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
+++ b/packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
@@ -68,7 +68,7 @@ describe('ReactCompositeComponent', () => {
     ReactDOM = require('react-dom');
     ReactDOMClient = require('react-dom/client');
     ReactSharedInternals =
-      require('react').__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      require('react').__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
     Scheduler = require('scheduler');
     assertLog = require('internal-test-utils').assertLog;
     act = require('internal-test-utils').act;
diff --git a/packages/react-dom/src/__tests__/ReactDOM-test.js b/packages/react-dom/src/__tests__/ReactDOM-test.js
index 2cb0f24e6944a..e4d7b0ddec658 100644
--- a/packages/react-dom/src/__tests__/ReactDOM-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOM-test.js
@@ -23,7 +23,8 @@ describe('ReactDOM', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     findDOMNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode;
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode;
     ReactDOMClient = require('react-dom/client');
     ReactDOMServer = require('react-dom/server');
 
diff --git a/packages/react-dom/src/__tests__/ReactDOMComponent-test.js b/packages/react-dom/src/__tests__/ReactDOMComponent-test.js
index 1d0c3581387da..b72b3da8ced02 100644
--- a/packages/react-dom/src/__tests__/ReactDOMComponent-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMComponent-test.js
@@ -2121,7 +2121,7 @@ describe('ReactDOMComponent', () => {
         componentWillUnmount() {
           // Should not throw
           expect(
-            ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+            ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
               this,
             ).nodeName,
           ).toBe('SPAN');
diff --git a/packages/react-dom/src/__tests__/ReactDOMEventListener-test.js b/packages/react-dom/src/__tests__/ReactDOMEventListener-test.js
index 189bc1d99f423..f6447642bceba 100644
--- a/packages/react-dom/src/__tests__/ReactDOMEventListener-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMEventListener-test.js
@@ -115,14 +115,14 @@ describe('ReactDOMEventListener', () => {
           };
           componentDidMount() {
             expect(
-              ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+              ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
                 this,
               ),
             ).toBe(container.firstChild);
           }
           componentDidUpdate() {
             expect(
-              ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+              ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
                 this,
               ),
             ).toBe(container.firstChild);
diff --git a/packages/react-dom/src/__tests__/ReactDOMLegacyFiber-test.js b/packages/react-dom/src/__tests__/ReactDOMLegacyFiber-test.js
index 9725d5fe0fbdc..b81dea9f18263 100644
--- a/packages/react-dom/src/__tests__/ReactDOMLegacyFiber-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMLegacyFiber-test.js
@@ -112,7 +112,7 @@ describe('ReactDOMLegacyFiber', () => {
     );
 
     const textNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
         instance,
       );
     expect(textNode).toBe(container.firstChild);
@@ -134,7 +134,7 @@ describe('ReactDOMLegacyFiber', () => {
     expect(container.childNodes.length).toBe(2);
 
     const firstNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
         instance,
       );
     expect(firstNode).toBe(container.firstChild);
@@ -166,7 +166,7 @@ describe('ReactDOMLegacyFiber', () => {
     expect(container.childNodes.length).toBe(2);
 
     const firstNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
         instance,
       );
     expect(firstNode).toBe(container.firstChild);
@@ -193,7 +193,7 @@ describe('ReactDOMLegacyFiber', () => {
     expect(container.childNodes.length).toBe(2);
 
     const firstNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
         instance,
       );
     expect(firstNode).toBe(container.firstChild);
@@ -891,7 +891,7 @@ describe('ReactDOMLegacyFiber', () => {
 
     const myNodeA = ReactDOM.render(<MyNode />, container);
     const a =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
         myNodeA,
       );
     expect(a.tagName).toBe('DIV');
@@ -900,7 +900,7 @@ describe('ReactDOMLegacyFiber', () => {
     expect(myNodeA === myNodeB).toBe(true);
 
     const b =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode(
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.findDOMNode(
         myNodeB,
       );
     expect(b.tagName).toBe('SPAN');
diff --git a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js
index 464e71ed43f70..e1aeea70fd806 100644
--- a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js
@@ -775,7 +775,7 @@ describe('ReactDOMServerHooks', () => {
   describe('readContext', () => {
     function readContext(Context) {
       const dispatcher =
-        React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.H;
+        React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.H;
       return dispatcher.readContext(Context);
     }
 
diff --git a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationNewContext-test.js b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationNewContext-test.js
index 850b52e3be8fb..2e573164a2e16 100644
--- a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationNewContext-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationNewContext-test.js
@@ -161,7 +161,8 @@ describe('ReactDOMServerIntegration', () => {
     itRenders('readContext() in different components', async render => {
       function readContext(Ctx) {
         const dispatcher =
-          React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.H;
+          React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+            .H;
         return dispatcher.readContext(Ctx);
       }
 
diff --git a/packages/react-dom/src/__tests__/ReactDOMSuspensePlaceholder-test.js b/packages/react-dom/src/__tests__/ReactDOMSuspensePlaceholder-test.js
index 12916166ecf0a..69789ad482349 100644
--- a/packages/react-dom/src/__tests__/ReactDOMSuspensePlaceholder-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMSuspensePlaceholder-test.js
@@ -26,7 +26,8 @@ describe('ReactDOMSuspensePlaceholder', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     findDOMNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode;
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode;
     ReactDOMClient = require('react-dom/client');
     Scheduler = require('scheduler');
     act = require('internal-test-utils').act;
diff --git a/packages/react-dom/src/__tests__/ReactEmptyComponent-test.js b/packages/react-dom/src/__tests__/ReactEmptyComponent-test.js
index d5274f964c2b5..0cb47904b6f56 100644
--- a/packages/react-dom/src/__tests__/ReactEmptyComponent-test.js
+++ b/packages/react-dom/src/__tests__/ReactEmptyComponent-test.js
@@ -27,7 +27,8 @@ describe('ReactEmptyComponent', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     findDOMNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode;
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode;
     ReactDOMClient = require('react-dom/client');
     Scheduler = require('scheduler');
     const InternalTestUtils = require('internal-test-utils');
diff --git a/packages/react-dom/src/__tests__/ReactLegacyCompositeComponent-test.js b/packages/react-dom/src/__tests__/ReactLegacyCompositeComponent-test.js
index 1f62d9ab20d97..a39fbb0540881 100644
--- a/packages/react-dom/src/__tests__/ReactLegacyCompositeComponent-test.js
+++ b/packages/react-dom/src/__tests__/ReactLegacyCompositeComponent-test.js
@@ -22,7 +22,8 @@ describe('ReactLegacyCompositeComponent', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     findDOMNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode;
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode;
     ReactDOMClient = require('react-dom/client');
     PropTypes = require('prop-types');
     act = require('internal-test-utils').act;
diff --git a/packages/react-dom/src/__tests__/ReactLegacyUpdates-test.js b/packages/react-dom/src/__tests__/ReactLegacyUpdates-test.js
index 942191372a3c0..2d539e750cfca 100644
--- a/packages/react-dom/src/__tests__/ReactLegacyUpdates-test.js
+++ b/packages/react-dom/src/__tests__/ReactLegacyUpdates-test.js
@@ -24,7 +24,8 @@ describe('ReactLegacyUpdates', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     findDOMNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode;
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode;
     act = require('internal-test-utils').act;
     Scheduler = require('scheduler');
 
diff --git a/packages/react-dom/src/__tests__/ReactServerRendering-test.js b/packages/react-dom/src/__tests__/ReactServerRendering-test.js
index 3dd1ca5ac3f8b..d2590e21f7d28 100644
--- a/packages/react-dom/src/__tests__/ReactServerRendering-test.js
+++ b/packages/react-dom/src/__tests__/ReactServerRendering-test.js
@@ -22,7 +22,7 @@ describe('ReactDOMServer', () => {
     PropTypes = require('prop-types');
     ReactDOMServer = require('react-dom/server');
     ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
   });
 
   describe('renderToString', () => {
diff --git a/packages/react-dom/src/__tests__/ReactUpdates-test.js b/packages/react-dom/src/__tests__/ReactUpdates-test.js
index d4acfaa9b35f8..d2a02f7956ec1 100644
--- a/packages/react-dom/src/__tests__/ReactUpdates-test.js
+++ b/packages/react-dom/src/__tests__/ReactUpdates-test.js
@@ -25,7 +25,8 @@ describe('ReactUpdates', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     findDOMNode =
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode;
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode;
     ReactDOMClient = require('react-dom/client');
     act = require('internal-test-utils').act;
     Scheduler = require('scheduler');
diff --git a/packages/react-dom/src/__tests__/react-dom-server-rendering-stub-test.js b/packages/react-dom/src/__tests__/react-dom-server-rendering-stub-test.js
index 28c4cb536d77d..9425ca1dd1f15 100644
--- a/packages/react-dom/src/__tests__/react-dom-server-rendering-stub-test.js
+++ b/packages/react-dom/src/__tests__/react-dom-server-rendering-stub-test.js
@@ -31,7 +31,8 @@ describe('react-dom-server-rendering-stub', () => {
     expect(ReactDOM.hydrateRoot).toBe(undefined);
     expect(ReactDOM.findDOMNode).toBe(undefined);
     expect(
-      ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.findDOMNode,
+      ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+        .findDOMNode,
     ).toBe(null);
     expect(ReactDOM.hydrate).toBe(undefined);
     expect(ReactDOM.render).toBe(undefined);
diff --git a/packages/react-dom/src/test-utils/ReactTestUtilsFB.js b/packages/react-dom/src/test-utils/ReactTestUtilsFB.js
index 0c82865384b9e..ad9a18d58abda 100644
--- a/packages/react-dom/src/test-utils/ReactTestUtilsFB.js
+++ b/packages/react-dom/src/test-utils/ReactTestUtilsFB.js
@@ -27,7 +27,7 @@ import isArray from 'shared/isArray';
 
 // Keep in sync with ReactDOM.js:
 const SecretInternals =
-  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 const EventInternals = SecretInternals.Events;
 const getInstanceFromNode = EventInternals[0];
 const getNodeFromInstance = EventInternals[1];
diff --git a/packages/react-dom/unstable_testing.classic.fb.js b/packages/react-dom/unstable_testing.classic.fb.js
index 9958b22cc3277..db9a26388fb93 100644
--- a/packages/react-dom/unstable_testing.classic.fb.js
+++ b/packages/react-dom/unstable_testing.classic.fb.js
@@ -26,7 +26,7 @@ export {
   preinit,
   preinitModule,
   version,
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
 } from './index.classic.fb.js';
 
 export {createRoot, hydrateRoot} from './client.js';
diff --git a/packages/react-dom/unstable_testing.experimental.js b/packages/react-dom/unstable_testing.experimental.js
index 2cbd3557cca93..da7aeb1fb1a92 100644
--- a/packages/react-dom/unstable_testing.experimental.js
+++ b/packages/react-dom/unstable_testing.experimental.js
@@ -20,7 +20,7 @@ export {
   preinit,
   preinitModule,
   version,
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
 } from './index.experimental.js';
 
 export {createRoot, hydrateRoot} from './client.js';
diff --git a/packages/react-dom/unstable_testing.modern.fb.js b/packages/react-dom/unstable_testing.modern.fb.js
index 17e78ae012adc..244d82025105f 100644
--- a/packages/react-dom/unstable_testing.modern.fb.js
+++ b/packages/react-dom/unstable_testing.modern.fb.js
@@ -21,7 +21,7 @@ export {
   preinit,
   preinitModule,
   version,
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
 } from './index.modern.fb.js';
 export {createRoot, hydrateRoot} from './client.js';
 export {
diff --git a/packages/react-dom/unstable_testing.stable.js b/packages/react-dom/unstable_testing.stable.js
index a0a460ce83a99..59b667fa15a7d 100644
--- a/packages/react-dom/unstable_testing.stable.js
+++ b/packages/react-dom/unstable_testing.stable.js
@@ -20,6 +20,6 @@ export {
   preinit,
   preinitModule,
   version,
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
 } from './index.stable.js';
 export {createRoot, hydrateRoot} from './client.js';
diff --git a/packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js b/packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js
index 2b72ddbf726a4..be4119bb797b9 100644
--- a/packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js
@@ -949,7 +949,7 @@ describe('ReactHooks', () => {
   it('warns when reading context inside useMemo', async () => {
     const {useMemo, createContext} = React;
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = createContext('light');
     function App() {
@@ -968,7 +968,7 @@ describe('ReactHooks', () => {
   it('warns when reading context inside useMemo after reading outside it', async () => {
     const {useMemo, createContext} = React;
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = createContext('light');
     let firstRead, secondRead;
@@ -994,7 +994,7 @@ describe('ReactHooks', () => {
   it('throws when reading context inside useEffect', async () => {
     const {useEffect, createContext} = React;
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = createContext('light');
     function App() {
@@ -1015,7 +1015,7 @@ describe('ReactHooks', () => {
   it('throws when reading context inside useLayoutEffect', async () => {
     const {useLayoutEffect, createContext} = React;
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = createContext('light');
     function App() {
@@ -1038,7 +1038,7 @@ describe('ReactHooks', () => {
   it('warns when reading context inside useReducer', async () => {
     const {useReducer, createContext} = React;
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = createContext('light');
     function App() {
@@ -1065,7 +1065,7 @@ describe('ReactHooks', () => {
     const ThemeContext = createContext('light');
 
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     let _setState;
     function Fn() {
@@ -1155,7 +1155,7 @@ describe('ReactHooks', () => {
 
   it('resets warning internal state when interrupted by an error', async () => {
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = React.createContext('light');
     function App() {
@@ -1243,7 +1243,7 @@ describe('ReactHooks', () => {
   it('warns when reading context inside useMemo', async () => {
     const {useMemo, createContext} = React;
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
     const ThemeContext = createContext('light');
     function App() {
diff --git a/packages/react-reconciler/src/__tests__/ReactMemo-test.js b/packages/react-reconciler/src/__tests__/ReactMemo-test.js
index 74ef98125b7c9..408629effec5a 100644
--- a/packages/react-reconciler/src/__tests__/ReactMemo-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactMemo-test.js
@@ -138,7 +138,9 @@ describe('memo', () => {
 
         function readContext(Context) {
           const dispatcher =
-            React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.H;
+            React
+              .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
+              .H;
           return dispatcher.readContext(Context);
         }
 
diff --git a/packages/react-reconciler/src/__tests__/ReactNewContext-test.js b/packages/react-reconciler/src/__tests__/ReactNewContext-test.js
index 6f8462607cc06..f5f043f8b7572 100644
--- a/packages/react-reconciler/src/__tests__/ReactNewContext-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactNewContext-test.js
@@ -49,7 +49,7 @@ describe('ReactNewContext', () => {
 
   function readContext(Context) {
     const dispatcher =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.H;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.H;
     return dispatcher.readContext(Context);
   }
 
diff --git a/packages/react-server/src/ReactSharedInternalsServer.js b/packages/react-server/src/ReactSharedInternalsServer.js
index cf356f36a5423..8ef67044feca1 100644
--- a/packages/react-server/src/ReactSharedInternalsServer.js
+++ b/packages/react-server/src/ReactSharedInternalsServer.js
@@ -11,7 +11,7 @@ import * as React from 'react';
 
 const ReactSharedInternalsServer =
   // $FlowFixMe: It's defined in the one we resolve to.
-  React.__SECRET_SERVER_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  React.__SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
 if (!ReactSharedInternalsServer) {
   throw new Error(
diff --git a/packages/react/index.classic.fb.js b/packages/react/index.classic.fb.js
index 00e6ee8a4077e..f38e4ec4a4597 100644
--- a/packages/react/index.classic.fb.js
+++ b/packages/react/index.classic.fb.js
@@ -8,7 +8,7 @@
  */
 
 export {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   act,
   Children,
   Component,
diff --git a/packages/react/index.experimental.js b/packages/react/index.experimental.js
index a7cb3e3cdf4a6..6c594578bfeec 100644
--- a/packages/react/index.experimental.js
+++ b/packages/react/index.experimental.js
@@ -8,7 +8,7 @@
  */
 
 export {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   act,
   Children,
   Component,
diff --git a/packages/react/index.js b/packages/react/index.js
index ba3a705cac28a..6dcbe3a83ef1f 100644
--- a/packages/react/index.js
+++ b/packages/react/index.js
@@ -29,7 +29,7 @@ export type ChildrenArray<+T> = $ReadOnlyArray<ChildrenArray<T>> | T;
 // Export all exports so that they're available in tests.
 // We can't use export * from in Flow for some reason.
 export {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   act,
   Children,
   Component,
diff --git a/packages/react/index.modern.fb.js b/packages/react/index.modern.fb.js
index 85a620595188e..fc2bf6dfeaa2a 100644
--- a/packages/react/index.modern.fb.js
+++ b/packages/react/index.modern.fb.js
@@ -8,7 +8,7 @@
  */
 
 export {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   act,
   Children,
   Component,
diff --git a/packages/react/index.stable.js b/packages/react/index.stable.js
index 5e356cf698987..a08110e809bd1 100644
--- a/packages/react/index.stable.js
+++ b/packages/react/index.stable.js
@@ -8,7 +8,7 @@
  */
 
 export {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   act,
   Children,
   Component,
diff --git a/packages/react/src/ReactClient.js b/packages/react/src/ReactClient.js
index 99492359fc7b9..759112f3e8b8b 100644
--- a/packages/react/src/ReactClient.js
+++ b/packages/react/src/ReactClient.js
@@ -106,7 +106,7 @@ export {
   cloneElement,
   isValidElement,
   ReactVersion as version,
-  ReactSharedInternals as __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  ReactSharedInternals as __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   // Concurrent Mode
   useTransition,
   startTransition,
diff --git a/packages/react/src/ReactServer.experimental.js b/packages/react/src/ReactServer.experimental.js
index c6036c79611ca..50efd138248c0 100644
--- a/packages/react/src/ReactServer.experimental.js
+++ b/packages/react/src/ReactServer.experimental.js
@@ -10,7 +10,7 @@
 // Patch fetch
 import './ReactFetch';
 
-export {default as __SECRET_SERVER_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './ReactSharedInternalsServer';
+export {default as __SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactSharedInternalsServer';
 
 import {forEach, map, count, toArray, only} from './ReactChildren';
 import {
diff --git a/packages/react/src/ReactServer.js b/packages/react/src/ReactServer.js
index fe1d13e9e5f23..79560c9129ea4 100644
--- a/packages/react/src/ReactServer.js
+++ b/packages/react/src/ReactServer.js
@@ -10,7 +10,7 @@
 // Patch fetch
 import './ReactFetch';
 
-export {default as __SECRET_SERVER_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED} from './ReactSharedInternalsServer';
+export {default as __SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactSharedInternalsServer';
 
 import {forEach, map, count, toArray, only} from './ReactChildren';
 import {
diff --git a/packages/scheduler/npm/umd/scheduler.development.js b/packages/scheduler/npm/umd/scheduler.development.js
index f7d2e7cd4cf0b..1b9682d8c5372 100644
--- a/packages/scheduler/npm/umd/scheduler.development.js
+++ b/packages/scheduler/npm/umd/scheduler.development.js
@@ -20,91 +20,91 @@
     : (global.Scheduler = factory(global));
 })(this, function (global) {
   function unstable_now() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_now.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_now.apply(
       this,
       arguments
     );
   }
 
   function unstable_scheduleCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_scheduleCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_scheduleCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_cancelCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_cancelCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_cancelCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_shouldYield() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_shouldYield.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_shouldYield.apply(
       this,
       arguments
     );
   }
 
   function unstable_requestPaint() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_requestPaint.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_requestPaint.apply(
       this,
       arguments
     );
   }
 
   function unstable_runWithPriority() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_runWithPriority.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_runWithPriority.apply(
       this,
       arguments
     );
   }
 
   function unstable_next() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_next.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_next.apply(
       this,
       arguments
     );
   }
 
   function unstable_wrapCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_wrapCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_wrapCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_getCurrentPriorityLevel() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_getCurrentPriorityLevel.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_getCurrentPriorityLevel.apply(
       this,
       arguments
     );
   }
 
   function unstable_getFirstCallbackNode() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_getFirstCallbackNode.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_getFirstCallbackNode.apply(
       this,
       arguments
     );
   }
 
   function unstable_pauseExecution() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_pauseExecution.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_pauseExecution.apply(
       this,
       arguments
     );
   }
 
   function unstable_continueExecution() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_continueExecution.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_continueExecution.apply(
       this,
       arguments
     );
   }
 
   function unstable_forceFrameRate() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_forceFrameRate.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_forceFrameRate.apply(
       this,
       arguments
     );
@@ -125,27 +125,33 @@
     unstable_getFirstCallbackNode: unstable_getFirstCallbackNode,
     unstable_forceFrameRate: unstable_forceFrameRate,
     get unstable_IdlePriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_IdlePriority;
     },
     get unstable_ImmediatePriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_ImmediatePriority;
     },
     get unstable_LowPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_LowPriority;
     },
     get unstable_NormalPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_NormalPriority;
     },
     get unstable_UserBlockingPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_UserBlockingPriority;
     },
     get unstable_Profiling() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_Profiling;
     },
   });
diff --git a/packages/scheduler/npm/umd/scheduler.production.min.js b/packages/scheduler/npm/umd/scheduler.production.min.js
index 1a1f5f5ee0b50..e6a5a94fc39a4 100644
--- a/packages/scheduler/npm/umd/scheduler.production.min.js
+++ b/packages/scheduler/npm/umd/scheduler.production.min.js
@@ -20,70 +20,70 @@
     : (global.Scheduler = factory(global));
 })(this, function (global) {
   function unstable_now() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_now.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_now.apply(
       this,
       arguments
     );
   }
 
   function unstable_scheduleCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_scheduleCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_scheduleCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_cancelCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_cancelCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_cancelCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_shouldYield() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_shouldYield.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_shouldYield.apply(
       this,
       arguments
     );
   }
 
   function unstable_requestPaint() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_requestPaint.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_requestPaint.apply(
       this,
       arguments
     );
   }
 
   function unstable_runWithPriority() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_runWithPriority.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_runWithPriority.apply(
       this,
       arguments
     );
   }
 
   function unstable_next() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_next.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_next.apply(
       this,
       arguments
     );
   }
 
   function unstable_wrapCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_wrapCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_wrapCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_getCurrentPriorityLevel() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_getCurrentPriorityLevel.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_getCurrentPriorityLevel.apply(
       this,
       arguments
     );
   }
 
   function unstable_getFirstCallbackNode() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_getFirstCallbackNode.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_getFirstCallbackNode.apply(
       this,
       arguments
     );
@@ -98,7 +98,7 @@
   }
 
   function unstable_forceFrameRate() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_forceFrameRate.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_forceFrameRate.apply(
       this,
       arguments
     );
@@ -119,27 +119,33 @@
     unstable_getFirstCallbackNode: unstable_getFirstCallbackNode,
     unstable_forceFrameRate: unstable_forceFrameRate,
     get unstable_IdlePriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_IdlePriority;
     },
     get unstable_ImmediatePriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_ImmediatePriority;
     },
     get unstable_LowPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_LowPriority;
     },
     get unstable_NormalPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_NormalPriority;
     },
     get unstable_UserBlockingPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_UserBlockingPriority;
     },
     get unstable_Profiling() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_Profiling;
     },
   });
diff --git a/packages/scheduler/npm/umd/scheduler.profiling.min.js b/packages/scheduler/npm/umd/scheduler.profiling.min.js
index 1a1f5f5ee0b50..e6a5a94fc39a4 100644
--- a/packages/scheduler/npm/umd/scheduler.profiling.min.js
+++ b/packages/scheduler/npm/umd/scheduler.profiling.min.js
@@ -20,70 +20,70 @@
     : (global.Scheduler = factory(global));
 })(this, function (global) {
   function unstable_now() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_now.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_now.apply(
       this,
       arguments
     );
   }
 
   function unstable_scheduleCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_scheduleCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_scheduleCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_cancelCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_cancelCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_cancelCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_shouldYield() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_shouldYield.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_shouldYield.apply(
       this,
       arguments
     );
   }
 
   function unstable_requestPaint() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_requestPaint.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_requestPaint.apply(
       this,
       arguments
     );
   }
 
   function unstable_runWithPriority() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_runWithPriority.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_runWithPriority.apply(
       this,
       arguments
     );
   }
 
   function unstable_next() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_next.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_next.apply(
       this,
       arguments
     );
   }
 
   function unstable_wrapCallback() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_wrapCallback.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_wrapCallback.apply(
       this,
       arguments
     );
   }
 
   function unstable_getCurrentPriorityLevel() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_getCurrentPriorityLevel.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_getCurrentPriorityLevel.apply(
       this,
       arguments
     );
   }
 
   function unstable_getFirstCallbackNode() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_getFirstCallbackNode.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_getFirstCallbackNode.apply(
       this,
       arguments
     );
@@ -98,7 +98,7 @@
   }
 
   function unstable_forceFrameRate() {
-    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_forceFrameRate.apply(
+    return global.React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.Scheduler.unstable_forceFrameRate.apply(
       this,
       arguments
     );
@@ -119,27 +119,33 @@
     unstable_getFirstCallbackNode: unstable_getFirstCallbackNode,
     unstable_forceFrameRate: unstable_forceFrameRate,
     get unstable_IdlePriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_IdlePriority;
     },
     get unstable_ImmediatePriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_ImmediatePriority;
     },
     get unstable_LowPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_LowPriority;
     },
     get unstable_NormalPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_NormalPriority;
     },
     get unstable_UserBlockingPriority() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_UserBlockingPriority;
     },
     get unstable_Profiling() {
-      return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+      return global.React
+        .__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE
         .Scheduler.unstable_Profiling;
     },
   });
diff --git a/packages/shared/ReactDOMSharedInternals.js b/packages/shared/ReactDOMSharedInternals.js
index d1cec6cab9785..515628acafe4e 100644
--- a/packages/shared/ReactDOMSharedInternals.js
+++ b/packages/shared/ReactDOMSharedInternals.js
@@ -10,6 +10,6 @@
 import * as ReactDOM from 'react-dom';
 
 const ReactDOMSharedInternals =
-  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  ReactDOM.__DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
 export default ReactDOMSharedInternals;
diff --git a/packages/shared/ReactSharedInternals.js b/packages/shared/ReactSharedInternals.js
index ebaf4340e4568..02573f9e8c6e6 100644
--- a/packages/shared/ReactSharedInternals.js
+++ b/packages/shared/ReactSharedInternals.js
@@ -10,6 +10,6 @@
 import * as React from 'react';
 
 const ReactSharedInternals =
-  React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+  React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
 export default ReactSharedInternals;
diff --git a/packages/shared/forks/Scheduler.umd.js b/packages/shared/forks/Scheduler.umd.js
index c202753d82520..9bcc8fa9db2f3 100644
--- a/packages/shared/forks/Scheduler.umd.js
+++ b/packages/shared/forks/Scheduler.umd.js
@@ -9,7 +9,8 @@
 
 import * as React from 'react';
 
-const ReactInternals = React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+const ReactInternals =
+  React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
 
 const {
   unstable_cancelCallback,
diff --git a/packages/shared/forks/consoleWithStackDev.www.js b/packages/shared/forks/consoleWithStackDev.www.js
index 7c0a40fe2a118..9a1b5e6167d03 100644
--- a/packages/shared/forks/consoleWithStackDev.www.js
+++ b/packages/shared/forks/consoleWithStackDev.www.js
@@ -35,7 +35,7 @@ function printWarning(level, format, args) {
   if (__DEV__) {
     const React = require('react');
     const ReactSharedInternals =
-      React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
     // Defensive in case this is fired before React is initialized.
     if (ReactSharedInternals != null) {
       const stack = ReactSharedInternals.getStackAddendum();
diff --git a/scripts/rollup/shims/facebook-www/ReactBrowserEventEmitter_DO_NOT_USE.js b/scripts/rollup/shims/facebook-www/ReactBrowserEventEmitter_DO_NOT_USE.js
index f262007ff65ba..38a1171bc2921 100644
--- a/scripts/rollup/shims/facebook-www/ReactBrowserEventEmitter_DO_NOT_USE.js
+++ b/scripts/rollup/shims/facebook-www/ReactBrowserEventEmitter_DO_NOT_USE.js
@@ -8,8 +8,8 @@
 'use strict';
 
 const {
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
 } = require('ReactDOM');
 
 module.exports =
-  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactBrowserEventEmitter;
+  __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE.ReactBrowserEventEmitter;