Remove custom error message from hook access error (#20604)

acdlite · web-flow · commit 58e8304483eb · 2021-01-19T14:20:22.000-08:00
It will still result in a null access error, so there's no change in
semantics. We will print a user-friendly error message in DEV.
diff --git a/packages/react-debug-tools/src/__tests__/ReactHooksInspection-test.js b/packages/react-debug-tools/src/__tests__/ReactHooksInspection-test.js
@@ -277,14 +277,17 @@ describe('ReactHooksInspection', () => {
     };
 
     expect(() => {
-      ReactDebugTools.inspectHooks(Foo, {}, FakeDispatcherRef);
-    }).toThrow(
+      expect(() => {
+        ReactDebugTools.inspectHooks(Foo, {}, FakeDispatcherRef);
+      }).toThrow("Cannot read property 'useState' of null");
+    }).toErrorDev(
       'Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for' +
         ' one of the following reasons:\n' +
         '1. You might have mismatching versions of React and the renderer (such as React DOM)\n' +
         '2. You might be breaking the Rules of Hooks\n' +
         '3. You might have more than one copy of React in the same app\n' +
         'See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.',
+      {withoutStack: true},
     );
 
     expect(getterCalls).toBe(1);
diff --git a/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js b/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
@@ -249,13 +249,18 @@ describe('ReactHooksWithNoopRenderer', () => {
   }
 
   it('throws when called outside the render phase', () => {
-    expect(() => useState(0)).toThrow(
+    expect(() => {
+      expect(() => useState(0)).toThrow(
+        "Cannot read property 'useState' of null",
+      );
+    }).toErrorDev(
       'Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for' +
         ' one of the following reasons:\n' +
         '1. You might have mismatching versions of React and the renderer (such as React DOM)\n' +
         '2. You might be breaking the Rules of Hooks\n' +
         '3. You might have more than one copy of React in the same app\n' +
         'See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.',
+      {withoutStack: true},
     );
   });
 
diff --git a/packages/react/src/ReactHooks.js b/packages/react/src/ReactHooks.js
@@ -7,6 +7,7 @@
  * @flow
  */
 
+import type {Dispatcher} from 'react-reconciler/src/ReactInternalTypes';
 import type {
   MutableSource,
   MutableSourceGetSnapshotFn,
@@ -15,25 +16,29 @@ import type {
 } from 'shared/ReactTypes';
 import type {OpaqueIDType} from 'react-reconciler/src/ReactFiberHostConfig';
 
-import invariant from 'shared/invariant';
-
 import ReactCurrentDispatcher from './ReactCurrentDispatcher';
 
 type BasicStateAction<S> = (S => S) | S;
 type Dispatch<A> = A => void;
 
 function resolveDispatcher() {
   const dispatcher = ReactCurrentDispatcher.current;
-  invariant(
-    dispatcher !== null,
-    'Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for' +
-      ' one of the following reasons:\n' +
-      '1. You might have mismatching versions of React and the renderer (such as React DOM)\n' +
-      '2. You might be breaking the Rules of Hooks\n' +
-      '3. You might have more than one copy of React in the same app\n' +
-      'See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.',
-  );
-  return dispatcher;
+  if (__DEV__) {
+    if (dispatcher === null) {
+      console.error(
+        'Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for' +
+          ' one of the following reasons:\n' +
+          '1. You might have mismatching versions of React and the renderer (such as React DOM)\n' +
+          '2. You might be breaking the Rules of Hooks\n' +
+          '3. You might have more than one copy of React in the same app\n' +
+          'See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.',
+      );
+    }
+  }
+  // Will result in a null access error if accessed outside render phase. We
+  // intentionally don't throw our own error because this is in a hot path.
+  // Also helps ensure this is inlined.
+  return ((dispatcher: any): Dispatcher);
 }
 
 export function getCacheForType<T>(resourceType: () => T): T {
