Add testing WWW feature flag file

We need it because WWW has a different meaning of experimental now.

packages/shared/forks/ReactFeatureFlags.testing.www.js

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import invariant from 'shared/invariant';
+
+import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
+import typeof * as ExportsType from './ReactFeatureFlags.testing.www';
+
+export const debugRenderPhaseSideEffectsForStrictMode = false;
+export const enableUserTimingAPI = false;
+export const warnAboutDeprecatedLifecycles = true;
+export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
+export const enableProfilerTimer = false;
+export const enableSchedulerTracing = false;
+export const enableSuspenseServerRenderer = true;
+export const enableSelectiveHydration = true;
+export const enableChunksAPI = true;
+export const disableJavaScriptURLs = true;
+export const disableInputAttributeSyncing = false;
+export const exposeConcurrentModeAPIs = true;
+export const warnAboutShorthandPropertyCollision = true;
+export const enableSchedulerDebugging = false;
+export const enableDeprecatedFlareAPI = true;
+export const enableFundamentalAPI = false;
+export const enableScopeAPI = true;
+export const enableJSXTransformAPI = true;
+export const warnAboutUnmockedScheduler = true;
+export const flushSuspenseFallbacksInTests = true;
+export const enableSuspenseCallback = true;
+export const warnAboutDefaultPropsOnFunctionComponents = false;
+export const warnAboutStringRefs = false;
+export const disableLegacyContext = __EXPERIMENTAL__;
+export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
+export const enableTrainModelFix = true;
+export const enableTrustedTypesIntegration = false;
+export const enableNativeTargetAsInstance = false;
+export const disableCreateFactory = __EXPERIMENTAL__;
+export const disableLegacyReactDOMAPIs = __EXPERIMENTAL__;
+export const disableTextareaChildren = __EXPERIMENTAL__;
+export const disableMapsAsChildren = __EXPERIMENTAL__;
+export const disableUnstableRenderSubtreeIntoContainer = __EXPERIMENTAL__;
+export const warnUnstableRenderSubtreeIntoContainer = false;
+export const disableUnstableCreatePortal = __EXPERIMENTAL__;
+export const deferPassiveEffectCleanupDuringUnmount = false;
+export const isTestEnvironment = true;
+
+// Only used in www builds.
+export function addUserTimingListener() {
+  invariant(false, 'Not implemented.');
+}
+
+// Flow magic to verify the exports of this file match the original version.
+// eslint-disable-next-line no-unused-vars
+type Check<_X, Y: _X, X: Y = _X> = null;
+// eslint-disable-next-line no-unused-expressions
+(null: Check<ExportsType, FeatureFlagsType>);

scripts/rollup/forks.js

@@ -107,8 +107,13 @@ const forks = Object.freeze({
         }
         return 'shared/forks/ReactFeatureFlags.test-renderer.js';
       case 'react-dom/testing':
-        return 'shared/forks/ReactFeatureFlags.testing.js';
       case 'react/testing':
+        switch (bundleType) {
+          case FB_WWW_DEV:
+          case FB_WWW_PROD:
+          case FB_WWW_PROFILING:
+            return 'shared/forks/ReactFeatureFlags.testing.www.js';
+        }
         return 'shared/forks/ReactFeatureFlags.testing.js';
       default:
         switch (bundleType) {