Add support for Suspense & lazy() to the react-is package (#14423)

* Add support for lazy & Suspense to react-is

packages/react-is/src/ReactIs.js

@@ -16,11 +16,13 @@ import {
   REACT_ELEMENT_TYPE,
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
+  REACT_LAZY_TYPE,
   REACT_MEMO_TYPE,
   REACT_PORTAL_TYPE,
   REACT_PROFILER_TYPE,
   REACT_PROVIDER_TYPE,
   REACT_STRICT_MODE_TYPE,
+  REACT_SUSPENSE_TYPE,
 } from 'shared/ReactSymbols';
 import isValidElementType from 'shared/isValidElementType';
 import lowPriorityWarning from 'shared/lowPriorityWarning';
@@ -38,6 +40,7 @@ export function typeOf(object: any) {
           case REACT_FRAGMENT_TYPE:
           case REACT_PROFILER_TYPE:
           case REACT_STRICT_MODE_TYPE:
+          case REACT_SUSPENSE_TYPE:
             return type;
           default:
             const $$typeofType = type && type.$$typeof;
@@ -51,6 +54,7 @@ export function typeOf(object: any) {
                 return $$typeof;
             }
         }
+      case REACT_LAZY_TYPE:
       case REACT_MEMO_TYPE:
       case REACT_PORTAL_TYPE:
         return $$typeof;
@@ -68,10 +72,12 @@ export const ContextProvider = REACT_PROVIDER_TYPE;
 export const Element = REACT_ELEMENT_TYPE;
 export const ForwardRef = REACT_FORWARD_REF_TYPE;
 export const Fragment = REACT_FRAGMENT_TYPE;
-export const Profiler = REACT_PROFILER_TYPE;
-export const Portal = REACT_PORTAL_TYPE;
+export const Lazy = REACT_LAZY_TYPE;
 export const Memo = REACT_MEMO_TYPE;
+export const Portal = REACT_PORTAL_TYPE;
+export const Profiler = REACT_PROFILER_TYPE;
 export const StrictMode = REACT_STRICT_MODE_TYPE;
+export const Suspense = REACT_SUSPENSE_TYPE;
 
 export {isValidElementType};
 
@@ -114,8 +120,8 @@ export function isForwardRef(object: any) {
 export function isFragment(object: any) {
   return typeOf(object) === REACT_FRAGMENT_TYPE;
 }
-export function isProfiler(object: any) {
-  return typeOf(object) === REACT_PROFILER_TYPE;
+export function isLazy(object: any) {
+  return typeOf(object) === REACT_LAZY_TYPE;
 }
 export function isMemo(object: any) {
   return typeOf(object) === REACT_MEMO_TYPE;
@@ -123,6 +129,12 @@ export function isMemo(object: any) {
 export function isPortal(object: any) {
   return typeOf(object) === REACT_PORTAL_TYPE;
 }
+export function isProfiler(object: any) {
+  return typeOf(object) === REACT_PROFILER_TYPE;
+}
 export function isStrictMode(object: any) {
   return typeOf(object) === REACT_STRICT_MODE_TYPE;
 }
+export function isSuspense(object: any) {
+  return typeOf(object) === REACT_SUSPENSE_TYPE;
+}

packages/react-is/src/__tests__/ReactIs-test.js

@@ -39,17 +39,19 @@ describe('ReactIs', () => {
     }
 
     const FunctionComponent = () => React.createElement('div');
-
     const ForwardRefComponent = React.forwardRef((props, ref) =>
       React.createElement(Component, {forwardedRef: ref, ...props}),
     );
-
+    const LazyComponent = React.lazy(() => Component);
+    const MemoComponent = React.memo(Component);
     const Context = React.createContext(false);
 
     expect(ReactIs.isValidElementType('div')).toEqual(true);
     expect(ReactIs.isValidElementType(Component)).toEqual(true);
     expect(ReactIs.isValidElementType(FunctionComponent)).toEqual(true);
     expect(ReactIs.isValidElementType(ForwardRefComponent)).toEqual(true);
+    expect(ReactIs.isValidElementType(LazyComponent)).toEqual(true);
+    expect(ReactIs.isValidElementType(MemoComponent)).toEqual(true);
     expect(ReactIs.isValidElementType(Context.Provider)).toEqual(true);
     expect(ReactIs.isValidElementType(Context.Consumer)).toEqual(true);
     expect(ReactIs.isValidElementType(React.createFactory('div'))).toEqual(
@@ -60,6 +62,7 @@ describe('ReactIs', () => {
       true,
     );
     expect(ReactIs.isValidElementType(React.StrictMode)).toEqual(true);
+    expect(ReactIs.isValidElementType(React.Suspense)).toEqual(true);
 
     expect(ReactIs.isValidElementType(true)).toEqual(false);
     expect(ReactIs.isValidElementType(123)).toEqual(false);
@@ -116,6 +119,7 @@ describe('ReactIs', () => {
     expect(ReactIs.isElement(<React.Fragment />)).toBe(true);
     expect(ReactIs.isElement(<React.unstable_ConcurrentMode />)).toBe(true);
     expect(ReactIs.isElement(<React.StrictMode />)).toBe(true);
+    expect(ReactIs.isElement(<React.Suspense />)).toBe(true);
   });
 
   it('should identify ref forwarding component', () => {
@@ -152,6 +156,14 @@ describe('ReactIs', () => {
     expect(ReactIs.isMemo(Component)).toBe(false);
   });
 
+  it('should identify lazy', () => {
+    const Component = () => React.createElement('div');
+    const lazyComponent = React.lazy(() => Component);
+    expect(ReactIs.typeOf(lazyComponent)).toBe(ReactIs.Lazy);
+    expect(ReactIs.isLazy(lazyComponent)).toBe(true);
+    expect(ReactIs.isLazy(Component)).toBe(false);
+  });
+
   it('should identify strict mode', () => {
     expect(ReactIs.typeOf(<React.StrictMode />)).toBe(ReactIs.StrictMode);
     expect(ReactIs.isStrictMode(<React.StrictMode />)).toBe(true);
@@ -160,6 +172,14 @@ describe('ReactIs', () => {
     expect(ReactIs.isStrictMode(<div />)).toBe(false);
   });
 
+  it('should identify suspense', () => {
+    expect(ReactIs.typeOf(<React.Suspense />)).toBe(ReactIs.Suspense);
+    expect(ReactIs.isSuspense(<React.Suspense />)).toBe(true);
+    expect(ReactIs.isSuspense({type: ReactIs.Suspense})).toBe(false);
+    expect(ReactIs.isSuspense('React.Suspense')).toBe(false);
+    expect(ReactIs.isSuspense(<div />)).toBe(false);
+  });
+
   it('should identify profile root', () => {
     expect(
       ReactIs.typeOf(<React.unstable_Profiler id="foo" onRender={jest.fn()} />),