[react-is] add back proper AsyncMode symbol, for back compat

- Partial revert of facebook#13732 - Fixes facebook#13958.
ljharb · Oct 24, 2018 · 3ea64dd · 3ea64dd
1 parent 275e76e
commit 3ea64dd
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Showing 3 changed files with 9 additions and 4 deletions.
diff --git a/packages/react-is/src/ReactIs.js b/packages/react-is/src/ReactIs.js
@@ -10,6 +10,7 @@
 'use strict';
 
 import {
+  REACT_ASYNC_MODE_TYPE,
   REACT_CONCURRENT_MODE_TYPE,
   REACT_CONTEXT_TYPE,
   REACT_ELEMENT_TYPE,
@@ -32,6 +33,7 @@ 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:
@@ -57,8 +59,8 @@ export function typeOf(object: any) {
   return undefined;
 }
 
-// AsyncMode alias is deprecated along with isAsyncMode
-export const AsyncMode = REACT_CONCURRENT_MODE_TYPE;
+// AsyncMode is deprecated along with isAsyncMode
+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;
@@ -86,7 +88,7 @@ export function isAsyncMode(object: any) {
       );
     }
   }
-  return isConcurrentMode(object);
+  return isConcurrentMode(object) || typeOf(object) === REACT_ASYNC_MODE_TYPE;
 }
 export function isConcurrentMode(object: any) {
   return typeOf(object) === REACT_CONCURRENT_MODE_TYPE;

diff --git a/packages/react-is/src/__tests__/ReactIs-test.js b/packages/react-is/src/__tests__/ReactIs-test.js
@@ -69,7 +69,7 @@ describe('ReactIs', () => {
     expect(ReactIs.isValidElementType({type: 'div', props: {}})).toEqual(false);
   });
 
-  it('should identify async mode', () => {
+  it('should identify concurrent mode', () => {
     expect(ReactIs.typeOf(<React.unstable_ConcurrentMode />)).toBe(
       ReactIs.ConcurrentMode,
     );

diff --git a/packages/shared/ReactSymbols.js b/packages/shared/ReactSymbols.js
@@ -32,6 +32,9 @@ 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')
+  : 0xeacf;
 export const REACT_CONCURRENT_MODE_TYPE = hasSymbol
   ? Symbol.for('react.concurrent_mode')
   : 0xeacf;