Remove logged errors for feature flags not implemented in native when skipNativeAPI is used (#49050)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49050

Changelog: [internal]

We added support for feature flags that don't have a native module definition so we could handle cases where the JS changes progressed faster than native ones, but we recently saw that when native catches up, the API starts logging an error through `console.error` about the native module method not being available.

That's an expected result of this feature and it's when we can clean up the code in JS, so we shouldn't be logging errors in that case.

This removes the error for them specifically.

Reviewed By: elicwhite

Differential Revision: D68843247

fbshipit-source-id: 730f3eba8c26959825cd9c3897f055a02a5f9591

packages/react-native/scripts/featureflags/templates/js/ReactNativeFeatureFlags.js-template.js

@@ -75,7 +75,7 @@ ${Object.entries(definitions.common)
  */
 export const ${flagName}: Getter<${typeof flagConfig.defaultValue}> = createNativeFlagGetter('${flagName}', ${JSON.stringify(
         flagConfig.defaultValue,
-      )});`,
+      )}${flagConfig.skipNativeAPI === true ? ', true' : ''});`,
   )
   .join('\n')}
 

packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<1292b8fff14cbf6ea3bffea28d0428bc>>
+ * @generated SignedSource<<3c609bd4ace6147f8f32af07a5e3cc05>>
  * @flow strict
  */
 
@@ -169,11 +169,11 @@ export const commonTestFlag: Getter<boolean> = createNativeFlagGetter('commonTes
 /**
  * Common flag for testing (without native implementation). Do NOT modify.
  */
-export const commonTestFlagWithoutNativeImplementation: Getter<boolean> = createNativeFlagGetter('commonTestFlagWithoutNativeImplementation', false);
+export const commonTestFlagWithoutNativeImplementation: Getter<boolean> = createNativeFlagGetter('commonTestFlagWithoutNativeImplementation', false, true);
 /**
  * The bridgeless architecture enables the event loop by default. This feature flag allows us to force disabling it in specific instances.
  */
-export const disableEventLoopOnBridgeless: Getter<boolean> = createNativeFlagGetter('disableEventLoopOnBridgeless', false);
+export const disableEventLoopOnBridgeless: Getter<boolean> = createNativeFlagGetter('disableEventLoopOnBridgeless', false, true);
 /**
  * Prevent FabricMountingManager from reordering mountitems, which may lead to invalid state on the UI thread
  */

packages/react-native/src/private/featureflags/ReactNativeFeatureFlagsBase.js

@@ -62,12 +62,13 @@ type NativeFeatureFlags = $NonMaybeType<typeof NativeReactNativeFeatureFlags>;
 export function createNativeFlagGetter<K: $Keys<NativeFeatureFlags>>(
   configName: K,
   defaultValue: ReturnType<$NonMaybeType<NativeFeatureFlags[K]>>,
+  skipUnavailableNativeModuleError: boolean = false,
 ): Getter<ReturnType<$NonMaybeType<NativeFeatureFlags[K]>>> {
   return createGetter(
     configName,
     () => {
       const valueFromNative = NativeReactNativeFeatureFlags?.[configName]?.();
-      if (valueFromNative == null) {
+      if (valueFromNative == null && !skipUnavailableNativeModuleError) {
         logUnavailableNativeModuleError(configName);
       }
       return valueFromNative;

packages/react-native/src/private/featureflags/__tests__/ReactNativeFeatureFlags-test.js

@@ -26,6 +26,15 @@ describe('ReactNativeFeatureFlags', () => {
     );
   });
 
+  it('should provide default values for common flags and NOT log an error if the native module is NOT available and `skipNativeAPI` is used', () => {
+    const ReactNativeFeatureFlags = require('../ReactNativeFeatureFlags');
+    expect(
+      ReactNativeFeatureFlags.commonTestFlagWithoutNativeImplementation(),
+    ).toBe(false);
+
+    expect(console.error).toHaveBeenCalledTimes(0);
+  });
+
   it('should provide default values for common flags and log an error if the method in the native module is NOT available', () => {
     jest.doMock('../specs/NativeReactNativeFeatureFlags', () => ({
       __esModule: true,