From 1c6fa3367ffca880729860ca95728317923f7d2d Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <dg@domgan.com>
Date: Wed, 26 Sep 2018 13:07:22 +0100
Subject: [PATCH 1/6] Rename AsyncMode -> ConcurrentMode

Run Prettier

Fix up

More renames
---
 .../unstable-async/time-slicing/src/index.js  |  4 +-
 .../ReactDOMFiberAsync-test.internal.js       | 32 +++++++-------
 .../src/__tests__/ReactDOMRoot-test.js        | 16 +++----
 .../ReactDOMServerIntegrationModes-test.js    | 44 +++++++++----------
 packages/react-dom/src/client/ReactDOM.js     |  8 ++--
 .../SimpleEventPlugin-test.internal.js        |  4 +-
 .../src/server/ReactPartialRenderer.js        |  4 +-
 packages/react-is/README.md                   |  6 +--
 packages/react-is/src/ReactIs.js              | 10 ++---
 .../react-is/src/__tests__/ReactIs-test.js    | 28 +++++++-----
 .../src/createReactNoop.js                    | 12 ++---
 packages/react-reconciler/src/ReactFiber.js   | 19 +++++---
 .../src/ReactFiberBeginWork.js                |  4 +-
 .../src/ReactFiberReconciler.js               |  4 +-
 .../react-reconciler/src/ReactFiberRoot.js    |  4 +-
 .../src/ReactFiberScheduler.js                |  4 +-
 .../src/ReactFiberUnwindWork.js               |  6 +--
 .../react-reconciler/src/ReactTypeOfMode.js   |  2 +-
 .../ReactIncrementalPerf-test.internal.js     |  6 +--
 .../__tests__/ReactSuspense-test.internal.js  | 24 +++++-----
 ...ReactIncrementalPerf-test.internal.js.snap |  2 +-
 .../src/ReactTestRenderer.js                  | 10 ++---
 .../__tests__/ReactTestRendererAsync-test.js  | 14 +++---
 packages/react/src/React.js                   |  4 +-
 .../__tests__/ReactProfiler-test.internal.js  | 36 +++++++--------
 .../ReactStrictMode-test.internal.js          | 32 +++++++-------
 packages/shared/ReactSymbols.js               |  4 +-
 packages/shared/getComponentName.js           |  6 +--
 packages/shared/isValidElementType.js         |  4 +-
 29 files changed, 182 insertions(+), 171 deletions(-)

diff --git a/fixtures/unstable-async/time-slicing/src/index.js b/fixtures/unstable-async/time-slicing/src/index.js
index 0b1436e04eceb..8b84d723acf4b 100644
--- a/fixtures/unstable-async/time-slicing/src/index.js
+++ b/fixtures/unstable-async/time-slicing/src/index.js
@@ -147,8 +147,8 @@ class App extends PureComponent {
 
 const container = document.getElementById('root');
 render(
-  <React.unstable_AsyncMode>
+  <React.unstable_ConcurrentMode>
     <App />
-  </React.unstable_AsyncMode>,
+  </React.unstable_ConcurrentMode>,
   container
 );
diff --git a/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.internal.js b/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.internal.js
index 5768aa5f5d45d..84cfb049f0a01 100644
--- a/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.internal.js
+++ b/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.internal.js
@@ -14,7 +14,7 @@ let ReactFeatureFlags = require('shared/ReactFeatureFlags');
 
 let ReactDOM;
 
-const AsyncMode = React.unstable_AsyncMode;
+const ConcurrentMode = React.unstable_ConcurrentMode;
 
 const setUntrackedInputValue = Object.getOwnPropertyDescriptor(
   HTMLInputElement.prototype,
@@ -108,9 +108,9 @@ describe('ReactDOMFiberAsync', () => {
       }
     }
     ReactDOM.render(
-      <AsyncMode>
+      <ConcurrentMode>
         <Counter />
-      </AsyncMode>,
+      </ConcurrentMode>,
       container,
     );
     expect(asyncValueRef.current.textContent).toBe('');
@@ -137,17 +137,17 @@ describe('ReactDOMFiberAsync', () => {
 
     it('renders synchronously', () => {
       ReactDOM.render(
-        <AsyncMode>
+        <ConcurrentMode>
           <div>Hi</div>
-        </AsyncMode>,
+        </ConcurrentMode>,
         container,
       );
       expect(container.textContent).toEqual('Hi');
 
       ReactDOM.render(
-        <AsyncMode>
+        <ConcurrentMode>
           <div>Bye</div>
-        </AsyncMode>,
+        </ConcurrentMode>,
         container,
       );
       expect(container.textContent).toEqual('Bye');
@@ -197,7 +197,7 @@ describe('ReactDOMFiberAsync', () => {
       expect(container.textContent).toEqual('1');
     });
 
-    it('AsyncMode creates an async subtree', () => {
+    it('ConcurrentMode creates an async subtree', () => {
       let instance;
       class Component extends React.Component {
         state = {step: 0};
@@ -208,9 +208,9 @@ describe('ReactDOMFiberAsync', () => {
       }
 
       ReactDOM.render(
-        <AsyncMode>
+        <ConcurrentMode>
           <Component />
-        </AsyncMode>,
+        </ConcurrentMode>,
         container,
       );
       jest.runAllTimers();
@@ -233,9 +233,9 @@ describe('ReactDOMFiberAsync', () => {
 
       ReactDOM.render(
         <div>
-          <AsyncMode>
+          <ConcurrentMode>
             <Child />
-          </AsyncMode>
+          </ConcurrentMode>
         </div>,
         container,
       );
@@ -364,9 +364,9 @@ describe('ReactDOMFiberAsync', () => {
       }
 
       ReactDOM.render(
-        <AsyncMode>
+        <ConcurrentMode>
           <Component />
-        </AsyncMode>,
+        </ConcurrentMode>,
         container,
       );
       jest.runAllTimers();
@@ -409,9 +409,9 @@ describe('ReactDOMFiberAsync', () => {
         }
       }
       ReactDOM.render(
-        <AsyncMode>
+        <ConcurrentMode>
           <Counter />
-        </AsyncMode>,
+        </ConcurrentMode>,
         container,
       );
       expect(container.textContent).toEqual('0');
diff --git a/packages/react-dom/src/__tests__/ReactDOMRoot-test.js b/packages/react-dom/src/__tests__/ReactDOMRoot-test.js
index 9f7801d2246cb..4157e64b46cad 100644
--- a/packages/react-dom/src/__tests__/ReactDOMRoot-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMRoot-test.js
@@ -12,7 +12,7 @@
 let React = require('react');
 let ReactDOM = require('react-dom');
 let ReactDOMServer = require('react-dom/server');
-let AsyncMode = React.unstable_AsyncMode;
+let ConcurrentMode = React.unstable_ConcurrentMode;
 
 describe('ReactDOMRoot', () => {
   let container;
@@ -63,7 +63,7 @@ describe('ReactDOMRoot', () => {
     React = require('react');
     ReactDOM = require('react-dom');
     ReactDOMServer = require('react-dom/server');
-    AsyncMode = React.unstable_AsyncMode;
+    ConcurrentMode = React.unstable_ConcurrentMode;
   });
 
   it('renders children', () => {
@@ -85,7 +85,7 @@ describe('ReactDOMRoot', () => {
 
   it('`root.render` returns a thenable work object', () => {
     const root = ReactDOM.unstable_createRoot(container);
-    const work = root.render(<AsyncMode>Hi</AsyncMode>);
+    const work = root.render(<ConcurrentMode>Hi</ConcurrentMode>);
     let ops = [];
     work.then(() => {
       ops.push('inside callback: ' + container.textContent);
@@ -103,7 +103,7 @@ describe('ReactDOMRoot', () => {
 
   it('resolves `work.then` callback synchronously if the work already committed', () => {
     const root = ReactDOM.unstable_createRoot(container);
-    const work = root.render(<AsyncMode>Hi</AsyncMode>);
+    const work = root.render(<ConcurrentMode>Hi</ConcurrentMode>);
     jest.runAllTimers();
     let ops = [];
     work.then(() => {
@@ -196,9 +196,9 @@ describe('ReactDOMRoot', () => {
     const root = ReactDOM.unstable_createRoot(container);
     const batch = root.createBatch();
     batch.render(
-      <AsyncMode>
+      <ConcurrentMode>
         <App />
-      </AsyncMode>,
+      </ConcurrentMode>,
     );
 
     jest.runAllTimers();
@@ -246,7 +246,7 @@ describe('ReactDOMRoot', () => {
   it('can wait for a batch to finish', () => {
     const root = ReactDOM.unstable_createRoot(container);
     const batch = root.createBatch();
-    batch.render(<AsyncMode>Foo</AsyncMode>);
+    batch.render(<ConcurrentMode>Foo</ConcurrentMode>);
 
     jest.runAllTimers();
 
@@ -286,7 +286,7 @@ describe('ReactDOMRoot', () => {
 
   it('can commit an empty batch', () => {
     const root = ReactDOM.unstable_createRoot(container);
-    root.render(<AsyncMode>1</AsyncMode>);
+    root.render(<ConcurrentMode>1</ConcurrentMode>);
 
     advanceCurrentTime(2000);
     // This batch has a later expiration time than the earlier update.
diff --git a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js
index ce37aa61616fb..3a4abc6abb249 100644
--- a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js
@@ -104,36 +104,36 @@ describe('ReactDOMServerIntegration', () => {
     });
   });
 
-  describe('React.unstable_AsyncMode', () => {
-    itRenders('an async mode with one child', async render => {
+  describe('React.unstable_ConcurrentMode', () => {
+    itRenders('an concurrent mode with one child', async render => {
       let e = await render(
-        <React.unstable_AsyncMode>
+        <React.unstable_ConcurrentMode>
           <div>text1</div>
-        </React.unstable_AsyncMode>,
+        </React.unstable_ConcurrentMode>,
       );
       let parent = e.parentNode;
       expect(parent.childNodes[0].tagName).toBe('DIV');
     });
 
-    itRenders('an async mode with several children', async render => {
+    itRenders('an concurrent mode with several children', async render => {
       let Header = props => {
         return <p>header</p>;
       };
       let Footer = props => {
         return (
-          <React.unstable_AsyncMode>
+          <React.unstable_ConcurrentMode>
             <h2>footer</h2>
             <h3>about</h3>
-          </React.unstable_AsyncMode>
+          </React.unstable_ConcurrentMode>
         );
       };
       let e = await render(
-        <React.unstable_AsyncMode>
+        <React.unstable_ConcurrentMode>
           <div>text1</div>
           <span>text2</span>
           <Header />
           <Footer />
-        </React.unstable_AsyncMode>,
+        </React.unstable_ConcurrentMode>,
       );
       let parent = e.parentNode;
       expect(parent.childNodes[0].tagName).toBe('DIV');
@@ -143,23 +143,23 @@ describe('ReactDOMServerIntegration', () => {
       expect(parent.childNodes[4].tagName).toBe('H3');
     });
 
-    itRenders('a nested async mode', async render => {
+    itRenders('a nested concurrent mode', async render => {
       let e = await render(
-        <React.unstable_AsyncMode>
-          <React.unstable_AsyncMode>
+        <React.unstable_ConcurrentMode>
+          <React.unstable_ConcurrentMode>
             <div>text1</div>
-          </React.unstable_AsyncMode>
+          </React.unstable_ConcurrentMode>
           <span>text2</span>
-          <React.unstable_AsyncMode>
-            <React.unstable_AsyncMode>
-              <React.unstable_AsyncMode>
+          <React.unstable_ConcurrentMode>
+            <React.unstable_ConcurrentMode>
+              <React.unstable_ConcurrentMode>
                 {null}
                 <p />
-              </React.unstable_AsyncMode>
+              </React.unstable_ConcurrentMode>
               {false}
-            </React.unstable_AsyncMode>
-          </React.unstable_AsyncMode>
-        </React.unstable_AsyncMode>,
+            </React.unstable_ConcurrentMode>
+          </React.unstable_ConcurrentMode>
+        </React.unstable_ConcurrentMode>,
       );
       let parent = e.parentNode;
       expect(parent.childNodes[0].tagName).toBe('DIV');
@@ -167,8 +167,8 @@ describe('ReactDOMServerIntegration', () => {
       expect(parent.childNodes[2].tagName).toBe('P');
     });
 
-    itRenders('an empty async mode', async render => {
-      expect(await render(<React.unstable_AsyncMode />)).toBe(null);
+    itRenders('an empty concurrent mode', async render => {
+      expect(await render(<React.unstable_ConcurrentMode />)).toBe(null);
     });
   });
 });
diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index f51239ca684b3..d82ee1a72cd2b 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -330,8 +330,8 @@ ReactWork.prototype._onCommit = function(): void {
   }
 };
 
-function ReactRoot(container: Container, isAsync: boolean, hydrate: boolean) {
-  const root = DOMRenderer.createContainer(container, isAsync, hydrate);
+function ReactRoot(container: Container, isConcurrent: boolean, hydrate: boolean) {
+  const root = DOMRenderer.createContainer(container, isConcurrent, hydrate);
   this._internalRoot = root;
 }
 ReactRoot.prototype.render = function(
@@ -497,8 +497,8 @@ function legacyCreateRootFromDOMContainer(
     }
   }
   // Legacy roots are not async by default.
-  const isAsync = false;
-  return new ReactRoot(container, isAsync, shouldHydrate);
+  const isConcurrent = false;
+  return new ReactRoot(container, isConcurrent, shouldHydrate);
 }
 
 function legacyRenderSubtreeIntoContainer(
diff --git a/packages/react-dom/src/events/__tests__/SimpleEventPlugin-test.internal.js b/packages/react-dom/src/events/__tests__/SimpleEventPlugin-test.internal.js
index ec74d34393682..3f11c7137145d 100644
--- a/packages/react-dom/src/events/__tests__/SimpleEventPlugin-test.internal.js
+++ b/packages/react-dom/src/events/__tests__/SimpleEventPlugin-test.internal.js
@@ -426,9 +426,9 @@ describe('SimpleEventPlugin', function() {
                 // Intentionally not using the updater form here
                 () => this.setState({highPriCount: this.state.highPriCount + 1})
               }>
-              <React.unstable_AsyncMode>
+              <React.unstable_ConcurrentMode>
                 <Button highPriCount={this.state.highPriCount} />
-              </React.unstable_AsyncMode>
+              </React.unstable_ConcurrentMode>
             </div>
           );
         }
diff --git a/packages/react-dom/src/server/ReactPartialRenderer.js b/packages/react-dom/src/server/ReactPartialRenderer.js
index 8989eaa1369ce..0b1e720595337 100644
--- a/packages/react-dom/src/server/ReactPartialRenderer.js
+++ b/packages/react-dom/src/server/ReactPartialRenderer.js
@@ -32,7 +32,7 @@ import {
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
   REACT_STRICT_MODE_TYPE,
-  REACT_ASYNC_MODE_TYPE,
+  REACT_CONCURRENT_MODE_TYPE,
   REACT_PLACEHOLDER_TYPE,
   REACT_PORTAL_TYPE,
   REACT_PROFILER_TYPE,
@@ -896,7 +896,7 @@ class ReactDOMServerRenderer {
 
       switch (elementType) {
         case REACT_STRICT_MODE_TYPE:
-        case REACT_ASYNC_MODE_TYPE:
+        case REACT_CONCURRENT_MODE_TYPE:
         case REACT_PROFILER_TYPE:
         case REACT_FRAGMENT_TYPE: {
           const nextChildren = toArray(
diff --git a/packages/react-is/README.md b/packages/react-is/README.md
index 80c1490b2e45c..a089be7359aee 100644
--- a/packages/react-is/README.md
+++ b/packages/react-is/README.md
@@ -44,14 +44,14 @@ ReactIs.isValidElementType(React.createFactory("div")); // true
 
 ### Determining an Element's Type
 
-#### AsyncMode
+#### ConcurrentMode
 
 ```js
 import React from "react";
 import * as ReactIs from 'react-is';
 
-ReactIs.isAsyncMode(<React.unstable_AsyncMode />); // true
-ReactIs.typeOf(<React.unstable_AsyncMode />) === ReactIs.AsyncMode; // true
+ReactIs.isConcurrentMode(<React.unstable_ConcurrentMode />); // true
+ReactIs.typeOf(<React.unstable_ConcurrentMode />) === ReactIs.ConcurrentMode; // true
 ```
 
 #### Context
diff --git a/packages/react-is/src/ReactIs.js b/packages/react-is/src/ReactIs.js
index ed5cfaa5355f6..c0e3b49dd978a 100644
--- a/packages/react-is/src/ReactIs.js
+++ b/packages/react-is/src/ReactIs.js
@@ -10,7 +10,7 @@
 'use strict';
 
 import {
-  REACT_ASYNC_MODE_TYPE,
+  REACT_CONCURRENT_MODE_TYPE,
   REACT_CONTEXT_TYPE,
   REACT_ELEMENT_TYPE,
   REACT_FORWARD_REF_TYPE,
@@ -31,7 +31,7 @@ export function typeOf(object: any) {
         const type = object.type;
 
         switch (type) {
-          case REACT_ASYNC_MODE_TYPE:
+          case REACT_CONCURRENT_MODE_TYPE:
           case REACT_FRAGMENT_TYPE:
           case REACT_PROFILER_TYPE:
           case REACT_STRICT_MODE_TYPE:
@@ -56,7 +56,7 @@ export function typeOf(object: any) {
   return undefined;
 }
 
-export const AsyncMode = REACT_ASYNC_MODE_TYPE;
+export const ConcurrentMode = REACT_CONCURRENT_MODE_TYPE;
 export const ContextConsumer = REACT_CONTEXT_TYPE;
 export const ContextProvider = REACT_PROVIDER_TYPE;
 export const Element = REACT_ELEMENT_TYPE;
@@ -68,8 +68,8 @@ export const StrictMode = REACT_STRICT_MODE_TYPE;
 
 export {isValidElementType};
 
-export function isAsyncMode(object: any) {
-  return typeOf(object) === REACT_ASYNC_MODE_TYPE;
+export function isConcurrentMode(object: any) {
+  return typeOf(object) === REACT_CONCURRENT_MODE_TYPE;
 }
 export function isContextConsumer(object: any) {
   return typeOf(object) === REACT_CONTEXT_TYPE;
diff --git a/packages/react-is/src/__tests__/ReactIs-test.js b/packages/react-is/src/__tests__/ReactIs-test.js
index 7833eae9563fa..86cca7a93e736 100644
--- a/packages/react-is/src/__tests__/ReactIs-test.js
+++ b/packages/react-is/src/__tests__/ReactIs-test.js
@@ -56,7 +56,9 @@ describe('ReactIs', () => {
       true,
     );
     expect(ReactIs.isValidElementType(React.Fragment)).toEqual(true);
-    expect(ReactIs.isValidElementType(React.unstable_AsyncMode)).toEqual(true);
+    expect(ReactIs.isValidElementType(React.unstable_ConcurrentMode)).toEqual(
+      true,
+    );
     expect(ReactIs.isValidElementType(React.StrictMode)).toEqual(true);
 
     expect(ReactIs.isValidElementType(true)).toEqual(false);
@@ -68,13 +70,17 @@ describe('ReactIs', () => {
   });
 
   it('should identify async mode', () => {
-    expect(ReactIs.typeOf(<React.unstable_AsyncMode />)).toBe(
-      ReactIs.AsyncMode,
+    expect(ReactIs.typeOf(<React.unstable_ConcurrentMode />)).toBe(
+      ReactIs.ConcurrentMode,
+    );
+    expect(ReactIs.isConcurrentMode(<React.unstable_ConcurrentMode />)).toBe(
+      true,
+    );
+    expect(ReactIs.isConcurrentMode({type: ReactIs.ConcurrentMode})).toBe(
+      false,
     );
-    expect(ReactIs.isAsyncMode(<React.unstable_AsyncMode />)).toBe(true);
-    expect(ReactIs.isAsyncMode({type: ReactIs.AsyncMode})).toBe(false);
-    expect(ReactIs.isAsyncMode(<React.StrictMode />)).toBe(false);
-    expect(ReactIs.isAsyncMode(<div />)).toBe(false);
+    expect(ReactIs.isConcurrentMode(<React.StrictMode />)).toBe(false);
+    expect(ReactIs.isConcurrentMode(<div />)).toBe(false);
   });
 
   it('should identify context consumers', () => {
@@ -108,7 +114,7 @@ describe('ReactIs', () => {
     expect(ReactIs.isElement(<Context.Provider />)).toBe(true);
     expect(ReactIs.isElement(<Context.Consumer />)).toBe(true);
     expect(ReactIs.isElement(<React.Fragment />)).toBe(true);
-    expect(ReactIs.isElement(<React.unstable_AsyncMode />)).toBe(true);
+    expect(ReactIs.isElement(<React.unstable_ConcurrentMode />)).toBe(true);
     expect(ReactIs.isElement(<React.StrictMode />)).toBe(true);
   });
 
@@ -117,7 +123,7 @@ describe('ReactIs', () => {
     expect(ReactIs.typeOf(<RefForwardingComponent />)).toBe(ReactIs.ForwardRef);
     expect(ReactIs.isForwardRef(<RefForwardingComponent />)).toBe(true);
     expect(ReactIs.isForwardRef({type: ReactIs.StrictMode})).toBe(false);
-    expect(ReactIs.isForwardRef(<React.unstable_AsyncMode />)).toBe(false);
+    expect(ReactIs.isForwardRef(<React.unstable_ConcurrentMode />)).toBe(false);
     expect(ReactIs.isForwardRef(<div />)).toBe(false);
   });
 
@@ -142,7 +148,7 @@ describe('ReactIs', () => {
     expect(ReactIs.typeOf(<React.StrictMode />)).toBe(ReactIs.StrictMode);
     expect(ReactIs.isStrictMode(<React.StrictMode />)).toBe(true);
     expect(ReactIs.isStrictMode({type: ReactIs.StrictMode})).toBe(false);
-    expect(ReactIs.isStrictMode(<React.unstable_AsyncMode />)).toBe(false);
+    expect(ReactIs.isStrictMode(<React.unstable_ConcurrentMode />)).toBe(false);
     expect(ReactIs.isStrictMode(<div />)).toBe(false);
   });
 
@@ -156,7 +162,7 @@ describe('ReactIs', () => {
       ),
     ).toBe(true);
     expect(ReactIs.isProfiler({type: ReactIs.unstable_Profiler})).toBe(false);
-    expect(ReactIs.isProfiler(<React.unstable_AsyncMode />)).toBe(false);
+    expect(ReactIs.isProfiler(<React.unstable_ConcurrentMode />)).toBe(false);
     expect(ReactIs.isProfiler(<div />)).toBe(false);
   });
 });
diff --git a/packages/react-noop-renderer/src/createReactNoop.js b/packages/react-noop-renderer/src/createReactNoop.js
index 85b3e7b44df69..691769f187d2e 100644
--- a/packages/react-noop-renderer/src/createReactNoop.js
+++ b/packages/react-noop-renderer/src/createReactNoop.js
@@ -451,13 +451,13 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
 
     getOrCreateRootContainer(
       rootID: string = DEFAULT_ROOT_ID,
-      isAsync: boolean = false,
+      isConcurrent: boolean = false,
     ) {
       let root = roots.get(rootID);
       if (!root) {
         const container = {rootID: rootID, children: []};
         rootContainers.set(rootID, container);
-        root = NoopRenderer.createContainer(container, isAsync, false);
+        root = NoopRenderer.createContainer(container, isConcurrent, false);
         roots.set(rootID, root);
       }
       return root.current.stateNode.containerInfo;
@@ -478,8 +478,8 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
 
     renderLegacySyncRoot(element: React$Element<any>, callback: ?Function) {
       const rootID = DEFAULT_ROOT_ID;
-      const isAsync = false;
-      const container = ReactNoop.getOrCreateRootContainer(rootID, isAsync);
+      const isConcurrent = false;
+      const container = ReactNoop.getOrCreateRootContainer(rootID, isConcurrent);
       const root = roots.get(container.rootID);
       NoopRenderer.updateContainer(element, root, null, callback);
     },
@@ -489,8 +489,8 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
       rootID: string,
       callback: ?Function,
     ) {
-      const isAsync = true;
-      const container = ReactNoop.getOrCreateRootContainer(rootID, isAsync);
+      const isConcurrent = true;
+      const container = ReactNoop.getOrCreateRootContainer(rootID, isConcurrent);
       const root = roots.get(container.rootID);
       NoopRenderer.updateContainer(element, root, null, callback);
     },
diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 5ba88f0011c95..019436c42fc4c 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -42,7 +42,12 @@ import getComponentName from 'shared/getComponentName';
 
 import {isDevToolsPresent} from './ReactFiberDevToolsHook';
 import {NoWork} from './ReactFiberExpirationTime';
-import {NoContext, AsyncMode, ProfileMode, StrictMode} from './ReactTypeOfMode';
+import {
+  NoContext,
+  ConcurrentMode,
+  ProfileMode,
+  StrictMode,
+} from './ReactTypeOfMode';
 import {
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
@@ -50,7 +55,7 @@ import {
   REACT_PROFILER_TYPE,
   REACT_PROVIDER_TYPE,
   REACT_CONTEXT_TYPE,
-  REACT_ASYNC_MODE_TYPE,
+  REACT_CONCURRENT_MODE_TYPE,
   REACT_PLACEHOLDER_TYPE,
 } from 'shared/ReactSymbols';
 
@@ -133,7 +138,7 @@ export type Fiber = {|
   firstContextDependency: ContextDependency<mixed> | null,
 
   // Bitfield that describes properties about the fiber and its subtree. E.g.
-  // the AsyncMode flag indicates whether the subtree should be async-by-
+  // the ConcurrentMode flag indicates whether the subtree should be async-by-
   // default. When a fiber is created, it inherits the mode of its
   // parent. Additional flags can be set at creation time, but after that the
   // value should remain unchanged throughout the fiber's lifetime, particularly
@@ -387,8 +392,8 @@ export function createWorkInProgress(
   return workInProgress;
 }
 
-export function createHostRootFiber(isAsync: boolean): Fiber {
-  let mode = isAsync ? AsyncMode | StrictMode : NoContext;
+export function createHostRootFiber(isConcurrent: boolean): Fiber {
+  let mode = isConcurrent ? ConcurrentMode | StrictMode : NoContext;
 
   if (enableProfilerTimer && isDevToolsPresent) {
     // Always collect profile timings when DevTools are present.
@@ -429,9 +434,9 @@ export function createFiberFromElement(
           expirationTime,
           key,
         );
-      case REACT_ASYNC_MODE_TYPE:
+      case REACT_CONCURRENT_MODE_TYPE:
         fiberTag = Mode;
-        mode |= AsyncMode | StrictMode;
+        mode |= ConcurrentMode | StrictMode;
         break;
       case REACT_STRICT_MODE_TYPE:
         fiberTag = Mode;
diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.js b/packages/react-reconciler/src/ReactFiberBeginWork.js
index 61c75d05cddc6..48f680cad3a3e 100644
--- a/packages/react-reconciler/src/ReactFiberBeginWork.js
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.js
@@ -66,7 +66,7 @@ import {
 } from './ReactChildFiber';
 import {processUpdateQueue} from './ReactUpdateQueue';
 import {NoWork, Never} from './ReactFiberExpirationTime';
-import {AsyncMode, StrictMode} from './ReactTypeOfMode';
+import {ConcurrentMode, StrictMode} from './ReactTypeOfMode';
 import {
   shouldSetTextContent,
   shouldDeprioritizeSubtree,
@@ -568,7 +568,7 @@ function updateHostComponent(current, workInProgress, renderExpirationTime) {
   // Check the host config to see if the children are offscreen/hidden.
   if (
     renderExpirationTime !== Never &&
-    workInProgress.mode & AsyncMode &&
+    workInProgress.mode & ConcurrentMode &&
     shouldDeprioritizeSubtree(type, nextProps)
   ) {
     // Schedule this fiber to re-render at offscreen priority. Then bailout.
diff --git a/packages/react-reconciler/src/ReactFiberReconciler.js b/packages/react-reconciler/src/ReactFiberReconciler.js
index 194f01503f82f..ca072d0c938f6 100644
--- a/packages/react-reconciler/src/ReactFiberReconciler.js
+++ b/packages/react-reconciler/src/ReactFiberReconciler.js
@@ -211,10 +211,10 @@ function findHostInstance(component: Object): PublicInstance | null {
 
 export function createContainer(
   containerInfo: Container,
-  isAsync: boolean,
+  isConcurrent: boolean,
   hydrate: boolean,
 ): OpaqueRoot {
-  return createFiberRoot(containerInfo, isAsync, hydrate);
+  return createFiberRoot(containerInfo, isConcurrent, hydrate);
 }
 
 export function updateContainer(
diff --git a/packages/react-reconciler/src/ReactFiberRoot.js b/packages/react-reconciler/src/ReactFiberRoot.js
index 9fa00cb805b7e..d257f3c93ab6f 100644
--- a/packages/react-reconciler/src/ReactFiberRoot.js
+++ b/packages/react-reconciler/src/ReactFiberRoot.js
@@ -101,12 +101,12 @@ export type FiberRoot = {
 
 export function createFiberRoot(
   containerInfo: any,
-  isAsync: boolean,
+  isConcurrent: boolean,
   hydrate: boolean,
 ): FiberRoot {
   // Cyclic construction. This cheats the type system right now because
   // stateNode is any.
-  const uninitializedFiber = createHostRootFiber(isAsync);
+  const uninitializedFiber = createHostRootFiber(isConcurrent);
 
   let root;
   if (enableSchedulerTracing) {
diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
index d312e60be8eb5..dcb0b8c105f78 100644
--- a/packages/react-reconciler/src/ReactFiberScheduler.js
+++ b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -112,7 +112,7 @@ import {
   computeAsyncExpiration,
   computeInteractiveExpiration,
 } from './ReactFiberExpirationTime';
-import {AsyncMode, ProfileMode} from './ReactTypeOfMode';
+import {ConcurrentMode, ProfileMode} from './ReactTypeOfMode';
 import {enqueueUpdate, resetCurrentlyProcessingQueue} from './ReactUpdateQueue';
 import {createCapturedValue} from './ReactCapturedValue';
 import {
@@ -1545,7 +1545,7 @@ function computeExpirationForFiber(currentTime: ExpirationTime, fiber: Fiber) {
   } else {
     // No explicit expiration context was set, and we're not currently
     // performing work. Calculate a new expiration time.
-    if (fiber.mode & AsyncMode) {
+    if (fiber.mode & ConcurrentMode) {
       if (isBatchingInteractiveUpdates) {
         // This is an interactive update
         expirationTime = computeInteractiveExpiration(currentTime);
diff --git a/packages/react-reconciler/src/ReactFiberUnwindWork.js b/packages/react-reconciler/src/ReactFiberUnwindWork.js
index 546af6c0e2138..bfd7714966e28 100644
--- a/packages/react-reconciler/src/ReactFiberUnwindWork.js
+++ b/packages/react-reconciler/src/ReactFiberUnwindWork.js
@@ -38,7 +38,7 @@ import {
   enableSuspense,
   enableSchedulerTracing,
 } from 'shared/ReactFeatureFlags';
-import {StrictMode, AsyncMode} from './ReactTypeOfMode';
+import {StrictMode, ConcurrentMode} from './ReactTypeOfMode';
 
 import {createCapturedValue} from './ReactCapturedValue';
 import {
@@ -211,10 +211,10 @@ function throwException(
         if (!didTimeout) {
           // Found the nearest boundary.
 
-          // If the boundary is not in async mode, we should not suspend, and
+          // If the boundary is not in concurrent mode, we should not suspend, and
           // likewise, when the promise resolves, we should ping synchronously.
           const pingTime =
-            (workInProgress.mode & AsyncMode) === NoEffect
+            (workInProgress.mode & ConcurrentMode) === NoEffect
               ? Sync
               : renderExpirationTime;
 
diff --git a/packages/react-reconciler/src/ReactTypeOfMode.js b/packages/react-reconciler/src/ReactTypeOfMode.js
index e579e05d9d344..a727bec843425 100644
--- a/packages/react-reconciler/src/ReactTypeOfMode.js
+++ b/packages/react-reconciler/src/ReactTypeOfMode.js
@@ -10,6 +10,6 @@
 export type TypeOfMode = number;
 
 export const NoContext = 0b000;
-export const AsyncMode = 0b001;
+export const ConcurrentMode = 0b001;
 export const StrictMode = 0b010;
 export const ProfileMode = 0b100;
diff --git a/packages/react-reconciler/src/__tests__/ReactIncrementalPerf-test.internal.js b/packages/react-reconciler/src/__tests__/ReactIncrementalPerf-test.internal.js
index f5725080ad9f5..bc1dca7adf592 100644
--- a/packages/react-reconciler/src/__tests__/ReactIncrementalPerf-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/ReactIncrementalPerf-test.internal.js
@@ -186,14 +186,14 @@ describe('ReactDebugFiberPerf', () => {
     expect(getFlameChart()).toMatchSnapshot();
   });
 
-  it('does not include AsyncMode, StrictMode, or Profiler components in measurements', () => {
+  it('does not include ConcurrentMode, StrictMode, or Profiler components in measurements', () => {
     ReactNoop.render(
       <React.unstable_Profiler id="test" onRender={jest.fn()}>
         <React.StrictMode>
           <Parent>
-            <React.unstable_AsyncMode>
+            <React.unstable_ConcurrentMode>
               <Child />
-            </React.unstable_AsyncMode>
+            </React.unstable_ConcurrentMode>
           </Parent>
         </React.StrictMode>
       </React.unstable_Profiler>,
diff --git a/packages/react-reconciler/src/__tests__/ReactSuspense-test.internal.js b/packages/react-reconciler/src/__tests__/ReactSuspense-test.internal.js
index 82ae915266328..2033b4e145385 100644
--- a/packages/react-reconciler/src/__tests__/ReactSuspense-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/ReactSuspense-test.internal.js
@@ -5,7 +5,7 @@ let ReactNoop;
 let SimpleCacheProvider;
 let Placeholder;
 let StrictMode;
-let AsyncMode;
+let ConcurrentMode;
 let lazy;
 
 let cache;
@@ -25,7 +25,7 @@ describe('ReactSuspense', () => {
     SimpleCacheProvider = require('simple-cache-provider');
     Placeholder = React.Placeholder;
     StrictMode = React.StrictMode;
-    AsyncMode = React.unstable_AsyncMode;
+    ConcurrentMode = React.unstable_ConcurrentMode;
     lazy = React.lazy;
 
     function invalidateCache() {
@@ -927,10 +927,10 @@ describe('ReactSuspense', () => {
       function App() {
         return (
           <Placeholder delayMs={1000} fallback={<Spinner />}>
-            <AsyncMode>
+            <ConcurrentMode>
               <UpdatingText ref={text} />
               <Text text="Sibling" />
-            </AsyncMode>
+            </ConcurrentMode>
           </Placeholder>
         );
       }
@@ -1004,7 +1004,7 @@ describe('ReactSuspense', () => {
           return (
             <StrictMode>
               <Placeholder delayMs={1000} fallback={<Text text="Loading..." />}>
-                <AsyncMode>
+                <ConcurrentMode>
                   <UpdatingText ref={text1} initialText="Async: 1">
                     {text => (
                       <Fragment>
@@ -1014,9 +1014,9 @@ describe('ReactSuspense', () => {
                       </Fragment>
                     )}
                   </UpdatingText>
-                </AsyncMode>
+                </ConcurrentMode>
               </Placeholder>
-              <AsyncMode>
+              <ConcurrentMode>
                 <UpdatingText ref={text2} initialText="Sync: 1">
                   {text => (
                     <Fragment>
@@ -1026,7 +1026,7 @@ describe('ReactSuspense', () => {
                     </Fragment>
                   )}
                 </UpdatingText>
-              </AsyncMode>
+              </ConcurrentMode>
             </StrictMode>
           );
         }
@@ -1136,7 +1136,7 @@ describe('ReactSuspense', () => {
           return (
             <Fragment>
               <Placeholder delayMs={1000} fallback={<Text text="Loading..." />}>
-                <AsyncMode>
+                <ConcurrentMode>
                   <UpdatingText ref={text1} initialText="Async: 1">
                     {text => (
                       <Fragment>
@@ -1146,9 +1146,9 @@ describe('ReactSuspense', () => {
                       </Fragment>
                     )}
                   </UpdatingText>
-                </AsyncMode>
+                </ConcurrentMode>
               </Placeholder>
-              <AsyncMode>
+              <ConcurrentMode>
                 <UpdatingText ref={text2} initialText="Sync: 1">
                   {text => (
                     <Fragment>
@@ -1158,7 +1158,7 @@ describe('ReactSuspense', () => {
                     </Fragment>
                   )}
                 </UpdatingText>
-              </AsyncMode>
+              </ConcurrentMode>
             </Fragment>
           );
         }
diff --git a/packages/react-reconciler/src/__tests__/__snapshots__/ReactIncrementalPerf-test.internal.js.snap b/packages/react-reconciler/src/__tests__/__snapshots__/ReactIncrementalPerf-test.internal.js.snap
index d725bf9bb0e37..dcef20d96875d 100644
--- a/packages/react-reconciler/src/__tests__/__snapshots__/ReactIncrementalPerf-test.internal.js.snap
+++ b/packages/react-reconciler/src/__tests__/__snapshots__/ReactIncrementalPerf-test.internal.js.snap
@@ -91,7 +91,7 @@ exports[`ReactDebugFiberPerf deduplicates lifecycle names during commit to reduc
 "
 `;
 
-exports[`ReactDebugFiberPerf does not include AsyncMode, StrictMode, or Profiler components in measurements 1`] = `
+exports[`ReactDebugFiberPerf does not include ConcurrentMode, StrictMode, or Profiler components in measurements 1`] = `
 "⚛ (Waiting for async callback... will force flush in 5250 ms)
 
 // Mount
diff --git a/packages/react-test-renderer/src/ReactTestRenderer.js b/packages/react-test-renderer/src/ReactTestRenderer.js
index ca9e59419e9ad..10b664651a017 100644
--- a/packages/react-test-renderer/src/ReactTestRenderer.js
+++ b/packages/react-test-renderer/src/ReactTestRenderer.js
@@ -39,7 +39,7 @@ import * as TestRendererScheduling from './ReactTestRendererScheduling';
 
 type TestRendererOptions = {
   createNodeMock: (element: React$Element<any>) => any,
-  unstable_isAsync: boolean,
+  unstable_isConcurrent: boolean,
 };
 
 type ReactTestRendererJSON = {|
@@ -419,13 +419,13 @@ function propsMatch(props: Object, filter: Object): boolean {
 const ReactTestRendererFiber = {
   create(element: React$Element<any>, options: TestRendererOptions) {
     let createNodeMock = defaultTestOptions.createNodeMock;
-    let isAsync = false;
+    let isConcurrent = false;
     if (typeof options === 'object' && options !== null) {
       if (typeof options.createNodeMock === 'function') {
         createNodeMock = options.createNodeMock;
       }
-      if (options.unstable_isAsync === true) {
-        isAsync = true;
+      if (options.unstable_isConcurrent === true) {
+        isConcurrent = true;
       }
     }
     let container = {
@@ -435,7 +435,7 @@ const ReactTestRendererFiber = {
     };
     let root: FiberRoot | null = TestRenderer.createContainer(
       container,
-      isAsync,
+      isConcurrent,
       false,
     );
     invariant(root != null, 'something went wrong');
diff --git a/packages/react-test-renderer/src/__tests__/ReactTestRendererAsync-test.js b/packages/react-test-renderer/src/__tests__/ReactTestRendererAsync-test.js
index 80963eced872c..bdf019e0fe031 100644
--- a/packages/react-test-renderer/src/__tests__/ReactTestRendererAsync-test.js
+++ b/packages/react-test-renderer/src/__tests__/ReactTestRendererAsync-test.js
@@ -25,7 +25,7 @@ describe('ReactTestRendererAsync', () => {
       return props.children;
     }
     const renderer = ReactTestRenderer.create(<Foo>Hi</Foo>, {
-      unstable_isAsync: true,
+      unstable_isConcurrent: true,
     });
 
     // Before flushing, nothing has mounted.
@@ -59,7 +59,7 @@ describe('ReactTestRendererAsync', () => {
       );
     }
     const renderer = ReactTestRenderer.create(<Parent step={1} />, {
-      unstable_isAsync: true,
+      unstable_isConcurrent: true,
     });
 
     expect(renderer).toFlushAll(['A:1', 'B:1', 'C:1']);
@@ -85,7 +85,7 @@ describe('ReactTestRendererAsync', () => {
       );
     }
     const renderer = ReactTestRenderer.create(<Parent step={1} />, {
-      unstable_isAsync: true,
+      unstable_isConcurrent: true,
     });
 
     // Flush the first two siblings
@@ -122,7 +122,7 @@ describe('ReactTestRendererAsync', () => {
     }
 
     const renderer = ReactTestRenderer.create(<Example step={1} />, {
-      unstable_isAsync: true,
+      unstable_isConcurrent: true,
     });
 
     // Flush the some of the changes, but don't commit
@@ -152,7 +152,7 @@ describe('ReactTestRendererAsync', () => {
           <Yield id="baz" />
         </div>,
         {
-          unstable_isAsync: true,
+          unstable_isConcurrent: true,
         },
       );
 
@@ -174,7 +174,7 @@ describe('ReactTestRendererAsync', () => {
           <Yield id="baz" />
         </div>,
         {
-          unstable_isAsync: true,
+          unstable_isConcurrent: true,
         },
       );
 
@@ -218,7 +218,7 @@ describe('ReactTestRendererAsync', () => {
       }
 
       const renderer = ReactTestRenderer.create(<App />, {
-        unstable_isAsync: true,
+        unstable_isConcurrent: true,
       });
 
       expect(() => {
diff --git a/packages/react/src/React.js b/packages/react/src/React.js
index 106ab898dc93f..27a5638a0845a 100644
--- a/packages/react/src/React.js
+++ b/packages/react/src/React.js
@@ -7,7 +7,7 @@
 
 import ReactVersion from 'shared/ReactVersion';
 import {
-  REACT_ASYNC_MODE_TYPE,
+  REACT_CONCURRENT_MODE_TYPE,
   REACT_FRAGMENT_TYPE,
   REACT_PROFILER_TYPE,
   REACT_STRICT_MODE_TYPE,
@@ -52,7 +52,7 @@ const React = {
 
   Fragment: REACT_FRAGMENT_TYPE,
   StrictMode: REACT_STRICT_MODE_TYPE,
-  unstable_AsyncMode: REACT_ASYNC_MODE_TYPE,
+  unstable_ConcurrentMode: REACT_CONCURRENT_MODE_TYPE,
   unstable_Profiler: REACT_PROFILER_TYPE,
 
   createElement: __DEV__ ? createElementWithValidation : createElement,
diff --git a/packages/react/src/__tests__/ReactProfiler-test.internal.js b/packages/react/src/__tests__/ReactProfiler-test.internal.js
index 802aa31c0dd22..ca6120b51ce4d 100644
--- a/packages/react/src/__tests__/ReactProfiler-test.internal.js
+++ b/packages/react/src/__tests__/ReactProfiler-test.internal.js
@@ -223,7 +223,7 @@ describe('Profiler', () => {
             <Yield value="last" />
           </React.unstable_Profiler>,
           {
-            unstable_isAsync: true,
+            unstable_isConcurrent: true,
           },
         );
 
@@ -578,7 +578,7 @@ describe('Profiler', () => {
               <Yield renderTime={2} />
               <Yield renderTime={3} />
             </React.unstable_Profiler>,
-            {unstable_isAsync: true},
+            {unstable_isConcurrent: true},
           );
           expect(renderer).toFlushThrough(['Yield:2']);
           expect(callback).toHaveBeenCalledTimes(0);
@@ -616,7 +616,7 @@ describe('Profiler', () => {
                 <Yield renderTime={17} />
               </React.unstable_Profiler>
             </React.unstable_Profiler>,
-            {unstable_isAsync: true},
+            {unstable_isConcurrent: true},
           );
           expect(renderer).toFlushThrough(['Yield:5']);
           expect(callback).toHaveBeenCalledTimes(0);
@@ -663,7 +663,7 @@ describe('Profiler', () => {
               <Yield renderTime={10} />
               <Yield renderTime={20} />
             </React.unstable_Profiler>,
-            {unstable_isAsync: true},
+            {unstable_isConcurrent: true},
           );
           expect(renderer).toFlushThrough(['Yield:10']);
           expect(callback).toHaveBeenCalledTimes(0);
@@ -714,7 +714,7 @@ describe('Profiler', () => {
               <Yield renderTime={6} />
               <Yield renderTime={15} />
             </React.unstable_Profiler>,
-            {unstable_isAsync: true},
+            {unstable_isConcurrent: true},
           );
 
           // Render everything initially.
@@ -820,7 +820,7 @@ describe('Profiler', () => {
               <FirstComponent />
               <SecondComponent />
             </React.unstable_Profiler>,
-            {unstable_isAsync: true},
+            {unstable_isConcurrent: true},
           );
 
           // Render everything initially.
@@ -1295,7 +1295,7 @@ describe('Profiler', () => {
         expect(() => {
           SchedulerTracing.unstable_trace('event', mockNow(), () => {
             renderer = ReactTestRenderer.create(<Component>fail</Component>, {
-              unstable_isAsync: true,
+              unstable_isConcurrent: true,
             });
           });
         }).toThrow('Expected error onWorkScheduled');
@@ -1304,7 +1304,7 @@ describe('Profiler', () => {
 
         // But should not leave React in a broken state for subsequent renders.
         renderer = ReactTestRenderer.create(<Component>succeed</Component>, {
-          unstable_isAsync: true,
+          unstable_isConcurrent: true,
         });
         expect(renderer).toFlushAll(['Component:succeed']);
         const tree = renderer.toTree();
@@ -1321,7 +1321,7 @@ describe('Profiler', () => {
         let renderer;
         SchedulerTracing.unstable_trace('event', mockNow(), () => {
           renderer = ReactTestRenderer.create(<Component>text</Component>, {
-            unstable_isAsync: true,
+            unstable_isConcurrent: true,
           });
         });
         onWorkStarted.mockClear();
@@ -1350,7 +1350,7 @@ describe('Profiler', () => {
         let renderer;
         SchedulerTracing.unstable_trace('event', mockNow(), () => {
           renderer = ReactTestRenderer.create(<Component>text</Component>, {
-            unstable_isAsync: true,
+            unstable_isConcurrent: true,
           });
         });
         expect(onInteractionScheduledWorkCompleted).not.toHaveBeenCalled();
@@ -1393,7 +1393,7 @@ describe('Profiler', () => {
         SchedulerTracing.unstable_trace(eventOne.name, mockNow(), () => {
           SchedulerTracing.unstable_trace(eventTwo.name, mockNow(), () => {
             renderer = ReactTestRenderer.create(<Component>text</Component>, {
-              unstable_isAsync: true,
+              unstable_isConcurrent: true,
             });
           });
         });
@@ -1482,7 +1482,7 @@ describe('Profiler', () => {
               <Example />
             </React.unstable_Profiler>,
             {
-              unstable_isAsync: true,
+              unstable_isConcurrent: true,
             },
           );
         },
@@ -1723,7 +1723,7 @@ describe('Profiler', () => {
           <FirstComponent />
           <SecondComponent />
         </React.unstable_Profiler>,
-        {unstable_isAsync: true},
+        {unstable_isConcurrent: true},
       );
 
       // Initial mount.
@@ -1897,7 +1897,7 @@ describe('Profiler', () => {
           <React.unstable_Profiler id="test" onRender={onRender}>
             <Example />
           </React.unstable_Profiler>,
-          {unstable_isAsync: true},
+          {unstable_isConcurrent: true},
         );
       });
 
@@ -2102,7 +2102,7 @@ describe('Profiler', () => {
       advanceTimeBy(1);
 
       const renderer = ReactTestRenderer.create(<Parent />, {
-        unstable_isAsync: true,
+        unstable_isConcurrent: true,
       });
       renderer.unstable_flushAll(['Child:0']);
       onRender.mockClear();
@@ -2413,7 +2413,7 @@ describe('Profiler', () => {
                 </React.Placeholder>
               </React.unstable_Profiler>,
               {
-                unstable_isAsync: true,
+                unstable_isConcurrent: true,
               },
             );
           },
@@ -2456,7 +2456,7 @@ describe('Profiler', () => {
                   <AsyncText text="loaded" ms={1000} />
                 </React.Placeholder>
               </React.unstable_Profiler>,
-              {unstable_isAsync: true},
+              {unstable_isConcurrent: true},
             );
           },
         );
@@ -2587,7 +2587,7 @@ describe('Profiler', () => {
                 </React.Placeholder>
                 <Text text="initial" />
               </React.unstable_Profiler>,
-              {unstable_isAsync: true},
+              {unstable_isConcurrent: true},
             );
           },
         );
diff --git a/packages/react/src/__tests__/ReactStrictMode-test.internal.js b/packages/react/src/__tests__/ReactStrictMode-test.internal.js
index 286587bc0e7cb..896c7c179e301 100644
--- a/packages/react/src/__tests__/ReactStrictMode-test.internal.js
+++ b/packages/react/src/__tests__/ReactStrictMode-test.internal.js
@@ -313,9 +313,9 @@ describe('ReactStrictMode', () => {
         UNSAFE_componentWillReceiveProps() {}
         render() {
           return (
-            <React.unstable_AsyncMode>
+            <React.unstable_ConcurrentMode>
               <AsyncRoot />
-            </React.unstable_AsyncMode>
+            </React.unstable_ConcurrentMode>
           );
         }
       }
@@ -357,7 +357,7 @@ describe('ReactStrictMode', () => {
         rendered = ReactTestRenderer.create(<SyncRoot />);
       }).toWarnDev(
         'Unsafe lifecycle methods were found within a strict-mode tree:' +
-          '\n    in AsyncMode (at **)' +
+          '\n    in ConcurrentMode (at **)' +
           '\n    in SyncRoot (at **)' +
           '\n\ncomponentWillMount: Please update the following components ' +
           'to use componentDidMount instead: AsyncRoot' +
@@ -381,9 +381,9 @@ describe('ReactStrictMode', () => {
         UNSAFE_componentWillReceiveProps() {}
         render() {
           return (
-            <React.unstable_AsyncMode>
+            <React.unstable_ConcurrentMode>
               <AsyncRoot />
-            </React.unstable_AsyncMode>
+            </React.unstable_ConcurrentMode>
           );
         }
       }
@@ -415,7 +415,7 @@ describe('ReactStrictMode', () => {
         () => (rendered = ReactTestRenderer.create(<SyncRoot />)),
       ).toWarnDev(
         'Unsafe lifecycle methods were found within a strict-mode tree:' +
-          '\n    in AsyncMode (at **)' +
+          '\n    in ConcurrentMode (at **)' +
           '\n    in SyncRoot (at **)' +
           '\n\ncomponentWillMount: Please update the following components ' +
           'to use componentDidMount instead: AsyncRoot, Parent' +
@@ -449,22 +449,22 @@ describe('ReactStrictMode', () => {
       class AsyncRootOne extends React.Component {
         render() {
           return (
-            <React.unstable_AsyncMode>
+            <React.unstable_ConcurrentMode>
               <Foo>
                 <Bar />
               </Foo>
-            </React.unstable_AsyncMode>
+            </React.unstable_ConcurrentMode>
           );
         }
       }
       class AsyncRootTwo extends React.Component {
         render() {
           return (
-            <React.unstable_AsyncMode>
+            <React.unstable_ConcurrentMode>
               <Foo>
                 <Baz />
               </Foo>
-            </React.unstable_AsyncMode>
+            </React.unstable_ConcurrentMode>
           );
         }
       }
@@ -493,14 +493,14 @@ describe('ReactStrictMode', () => {
         () => (rendered = ReactTestRenderer.create(<SyncRoot />)),
       ).toWarnDev([
         'Unsafe lifecycle methods were found within a strict-mode tree:' +
-          '\n    in AsyncMode (at **)' +
+          '\n    in ConcurrentMode (at **)' +
           '\n    in AsyncRootOne (at **)' +
           '\n    in div (at **)' +
           '\n    in SyncRoot (at **)' +
           '\n\ncomponentWillMount: Please update the following components ' +
           'to use componentDidMount instead: Bar, Foo',
         'Unsafe lifecycle methods were found within a strict-mode tree:' +
-          '\n    in AsyncMode (at **)' +
+          '\n    in ConcurrentMode (at **)' +
           '\n    in AsyncRootTwo (at **)' +
           '\n    in div (at **)' +
           '\n    in SyncRoot (at **)' +
@@ -517,9 +517,9 @@ describe('ReactStrictMode', () => {
       class AsyncRoot extends React.Component {
         render() {
           return (
-            <React.unstable_AsyncMode>
+            <React.unstable_ConcurrentMode>
               {this.props.foo ? <Foo /> : <Bar />}
-            </React.unstable_AsyncMode>
+            </React.unstable_ConcurrentMode>
           );
         }
       }
@@ -541,7 +541,7 @@ describe('ReactStrictMode', () => {
         rendered = ReactTestRenderer.create(<AsyncRoot foo={true} />);
       }).toWarnDev(
         'Unsafe lifecycle methods were found within a strict-mode tree:' +
-          '\n    in AsyncMode (at **)' +
+          '\n    in ConcurrentMode (at **)' +
           '\n    in AsyncRoot (at **)' +
           '\n\ncomponentWillMount: Please update the following components ' +
           'to use componentDidMount instead: Foo' +
@@ -551,7 +551,7 @@ describe('ReactStrictMode', () => {
 
       expect(() => rendered.update(<AsyncRoot foo={false} />)).toWarnDev(
         'Unsafe lifecycle methods were found within a strict-mode tree:' +
-          '\n    in AsyncMode (at **)' +
+          '\n    in ConcurrentMode (at **)' +
           '\n    in AsyncRoot (at **)' +
           '\n\ncomponentWillMount: Please update the following components ' +
           'to use componentDidMount instead: Bar' +
diff --git a/packages/shared/ReactSymbols.js b/packages/shared/ReactSymbols.js
index 0653cae1656c1..a13a5fc792eb8 100644
--- a/packages/shared/ReactSymbols.js
+++ b/packages/shared/ReactSymbols.js
@@ -32,8 +32,8 @@ export const REACT_PROVIDER_TYPE = hasSymbol
 export const REACT_CONTEXT_TYPE = hasSymbol
   ? Symbol.for('react.context')
   : 0xeace;
-export const REACT_ASYNC_MODE_TYPE = hasSymbol
-  ? Symbol.for('react.async_mode')
+export const REACT_CONCURRENT_MODE_TYPE = hasSymbol
+  ? Symbol.for('react.concurrent_mode')
   : 0xeacf;
 export const REACT_FORWARD_REF_TYPE = hasSymbol
   ? Symbol.for('react.forward_ref')
diff --git a/packages/shared/getComponentName.js b/packages/shared/getComponentName.js
index e39a6965e02e3..00625cf3304c5 100644
--- a/packages/shared/getComponentName.js
+++ b/packages/shared/getComponentName.js
@@ -11,7 +11,7 @@ import type {Thenable} from 'shared/ReactLazyComponent';
 
 import warningWithoutStack from 'shared/warningWithoutStack';
 import {
-  REACT_ASYNC_MODE_TYPE,
+  REACT_CONCURRENT_MODE_TYPE,
   REACT_CONTEXT_TYPE,
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
@@ -44,8 +44,8 @@ function getComponentName(type: mixed): string | null {
     return type;
   }
   switch (type) {
-    case REACT_ASYNC_MODE_TYPE:
-      return 'AsyncMode';
+    case REACT_CONCURRENT_MODE_TYPE:
+      return 'ConcurrentMode';
     case REACT_FRAGMENT_TYPE:
       return 'Fragment';
     case REACT_PORTAL_TYPE:
diff --git a/packages/shared/isValidElementType.js b/packages/shared/isValidElementType.js
index 7fb50fa5f84da..22fab9d39aae3 100644
--- a/packages/shared/isValidElementType.js
+++ b/packages/shared/isValidElementType.js
@@ -8,7 +8,7 @@
  */
 
 import {
-  REACT_ASYNC_MODE_TYPE,
+  REACT_CONCURRENT_MODE_TYPE,
   REACT_CONTEXT_TYPE,
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
@@ -24,7 +24,7 @@ export default function isValidElementType(type: mixed) {
     typeof type === 'function' ||
     // Note: its typeof might be other than 'symbol' or 'number' if it's a polyfill.
     type === REACT_FRAGMENT_TYPE ||
-    type === REACT_ASYNC_MODE_TYPE ||
+    type === REACT_CONCURRENT_MODE_TYPE ||
     type === REACT_PROFILER_TYPE ||
     type === REACT_STRICT_MODE_TYPE ||
     type === REACT_PLACEHOLDER_TYPE ||

From 5d6d348e0d286cbe460f104095e847df4860e4ca Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <dg@domgan.com>
Date: Wed, 26 Sep 2018 13:20:55 +0100
Subject: [PATCH 2/6] Run Prettier

---
 packages/react-dom/src/client/ReactDOM.js           |  6 +++++-
 packages/react-noop-renderer/src/createReactNoop.js | 10 ++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index d82ee1a72cd2b..f0cf8ea162795 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -330,7 +330,11 @@ ReactWork.prototype._onCommit = function(): void {
   }
 };
 
-function ReactRoot(container: Container, isConcurrent: boolean, hydrate: boolean) {
+function ReactRoot(
+  container: Container,
+  isConcurrent: boolean,
+  hydrate: boolean,
+) {
   const root = DOMRenderer.createContainer(container, isConcurrent, hydrate);
   this._internalRoot = root;
 }
diff --git a/packages/react-noop-renderer/src/createReactNoop.js b/packages/react-noop-renderer/src/createReactNoop.js
index 691769f187d2e..5cb913b5d1a1f 100644
--- a/packages/react-noop-renderer/src/createReactNoop.js
+++ b/packages/react-noop-renderer/src/createReactNoop.js
@@ -479,7 +479,10 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
     renderLegacySyncRoot(element: React$Element<any>, callback: ?Function) {
       const rootID = DEFAULT_ROOT_ID;
       const isConcurrent = false;
-      const container = ReactNoop.getOrCreateRootContainer(rootID, isConcurrent);
+      const container = ReactNoop.getOrCreateRootContainer(
+        rootID,
+        isConcurrent,
+      );
       const root = roots.get(container.rootID);
       NoopRenderer.updateContainer(element, root, null, callback);
     },
@@ -490,7 +493,10 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
       callback: ?Function,
     ) {
       const isConcurrent = true;
-      const container = ReactNoop.getOrCreateRootContainer(rootID, isConcurrent);
+      const container = ReactNoop.getOrCreateRootContainer(
+        rootID,
+        isConcurrent,
+      );
       const root = roots.get(container.rootID);
       NoopRenderer.updateContainer(element, root, null, callback);
     },

From 87728c3ed1501a27efbb6e5d91acce5dfc5ee880 Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <dg@domgan.com>
Date: Wed, 26 Sep 2018 13:52:25 +0100
Subject: [PATCH 3/6] Add deprecation warning for ReactIs.isAsyncMode

---
 packages/react-is/src/ReactIs.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/packages/react-is/src/ReactIs.js b/packages/react-is/src/ReactIs.js
index c0e3b49dd978a..86e779f3f1401 100644
--- a/packages/react-is/src/ReactIs.js
+++ b/packages/react-is/src/ReactIs.js
@@ -21,6 +21,7 @@ import {
   REACT_STRICT_MODE_TYPE,
 } from 'shared/ReactSymbols';
 import isValidElementType from 'shared/isValidElementType';
+import lowPriorityWarning from 'shared/lowPriorityWarning';
 
 export function typeOf(object: any) {
   if (typeof object === 'object' && object !== null) {
@@ -56,6 +57,8 @@ export function typeOf(object: any) {
   return undefined;
 }
 
+// AsyncMode alias is deprecated along with isAsyncMode
+export const AsyncMode = REACT_CONCURRENT_MODE_TYPE;
 export const ConcurrentMode = REACT_CONCURRENT_MODE_TYPE;
 export const ContextConsumer = REACT_CONTEXT_TYPE;
 export const ContextProvider = REACT_PROVIDER_TYPE;
@@ -68,6 +71,16 @@ export const StrictMode = REACT_STRICT_MODE_TYPE;
 
 export {isValidElementType};
 
+// AsyncMode should be deprecated
+export function isAsyncMode(object: any) {
+  lowPriorityWarning(
+    false,
+    'The ReactIs.isAsyncMode() alias has been deprecated, ' +
+      'and will be removed in React 17+. Update your code to use ' +
+      'ReactIs.isConcurrentMode() instead. It has the exact same API.'
+  );
+  return isConcurrentMode(object);
+}
 export function isConcurrentMode(object: any) {
   return typeOf(object) === REACT_CONCURRENT_MODE_TYPE;
 }

From b9a37295c10ec8ef77ab19b64d9a07324ad1d9c2 Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <dg@domgan.com>
Date: Wed, 26 Sep 2018 13:52:41 +0100
Subject: [PATCH 4/6] Prettier

---
 packages/react-is/src/ReactIs.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-is/src/ReactIs.js b/packages/react-is/src/ReactIs.js
index 86e779f3f1401..f2fba44f30796 100644
--- a/packages/react-is/src/ReactIs.js
+++ b/packages/react-is/src/ReactIs.js
@@ -77,7 +77,7 @@ export function isAsyncMode(object: any) {
     false,
     'The ReactIs.isAsyncMode() alias has been deprecated, ' +
       'and will be removed in React 17+. Update your code to use ' +
-      'ReactIs.isConcurrentMode() instead. It has the exact same API.'
+      'ReactIs.isConcurrentMode() instead. It has the exact same API.',
   );
   return isConcurrentMode(object);
 }

From 27828319c05e2ff97bb3743a87b2c659b1ed7279 Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <dg@domgan.com>
Date: Wed, 26 Sep 2018 13:58:24 +0100
Subject: [PATCH 5/6] add boolean flag around deprecation warning

---
 packages/react-is/src/ReactIs.js | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/packages/react-is/src/ReactIs.js b/packages/react-is/src/ReactIs.js
index f2fba44f30796..2be14b7b4411e 100644
--- a/packages/react-is/src/ReactIs.js
+++ b/packages/react-is/src/ReactIs.js
@@ -71,14 +71,19 @@ export const StrictMode = REACT_STRICT_MODE_TYPE;
 
 export {isValidElementType};
 
+let hasWarnedAboutDeprecatedIsAsyncMode = false;
+
 // AsyncMode should be deprecated
 export function isAsyncMode(object: any) {
-  lowPriorityWarning(
-    false,
-    'The ReactIs.isAsyncMode() alias has been deprecated, ' +
-      'and will be removed in React 17+. Update your code to use ' +
-      'ReactIs.isConcurrentMode() instead. It has the exact same API.',
-  );
+  if (!hasWarnedAboutDeprecatedIsAsyncMode) {
+    hasWarnedAboutDeprecatedIsAsyncMode = true;
+    lowPriorityWarning(
+      false,
+      'The ReactIs.isAsyncMode() alias has been deprecated, ' +
+        'and will be removed in React 17+. Update your code to use ' +
+        'ReactIs.isConcurrentMode() instead. It has the exact same API.',
+    );
+  }
   return isConcurrentMode(object);
 }
 export function isConcurrentMode(object: any) {

From d02c8b8a997a90cf60210de859cd202d96411c2f Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <dg@domgan.com>
Date: Wed, 26 Sep 2018 16:52:44 +0100
Subject: [PATCH 6/6] add DEV check

---
 packages/react-is/src/ReactIs.js | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/packages/react-is/src/ReactIs.js b/packages/react-is/src/ReactIs.js
index 2be14b7b4411e..97a4212d6c85e 100644
--- a/packages/react-is/src/ReactIs.js
+++ b/packages/react-is/src/ReactIs.js
@@ -75,14 +75,16 @@ let hasWarnedAboutDeprecatedIsAsyncMode = false;
 
 // AsyncMode should be deprecated
 export function isAsyncMode(object: any) {
-  if (!hasWarnedAboutDeprecatedIsAsyncMode) {
-    hasWarnedAboutDeprecatedIsAsyncMode = true;
-    lowPriorityWarning(
-      false,
-      'The ReactIs.isAsyncMode() alias has been deprecated, ' +
-        'and will be removed in React 17+. Update your code to use ' +
-        'ReactIs.isConcurrentMode() instead. It has the exact same API.',
-    );
+  if (__DEV__) {
+    if (!hasWarnedAboutDeprecatedIsAsyncMode) {
+      hasWarnedAboutDeprecatedIsAsyncMode = true;
+      lowPriorityWarning(
+        false,
+        'The ReactIs.isAsyncMode() alias has been deprecated, ' +
+          'and will be removed in React 17+. Update your code to use ' +
+          'ReactIs.isConcurrentMode() instead. It has the exact same API.',
+      );
+    }
   }
   return isConcurrentMode(object);
 }