refactor[isChildPublicInstance]: don't leak ReactNativeFiberHostComponent to Fabric implementation

Author: hoxyq

packages/react-native-renderer/src/ReactNativePublicCompat.js

@@ -234,25 +234,6 @@ export function isChildPublicInstance(
   childInstance: FabricPublicInstance | PaperPublicInstance,
 ): boolean {
   if (__DEV__) {
-    // Paper
-    if (
-      parentInstance instanceof ReactNativeFiberHostComponent ||
-      childInstance instanceof ReactNativeFiberHostComponent
-    ) {
-      if (
-        parentInstance instanceof ReactNativeFiberHostComponent &&
-        childInstance instanceof ReactNativeFiberHostComponent
-      ) {
-        return doesFiberContain(
-          parentInstance._internalFiberInstanceHandleDEV,
-          childInstance._internalFiberInstanceHandleDEV,
-        );
-      }
-
-      // Means that one instance is from Fabric and other is from Paper.
-      return false;
-    }
-
     const parentInternalInstanceHandle =
       // $FlowExpectedError[incompatible-call] Type for parentInstance should have been PublicInstance from ReactFiberConfigFabric.
       getInternalInstanceHandleFromPublicInstance(parentInstance);
@@ -271,6 +252,24 @@ export function isChildPublicInstance(
       );
     }
 
+    // Paper
+    if (
+      // $FlowExpectedError[incompatible-type]
+      // $FlowExpectedError[prop-missing] Don't check via `instanceof ReactNativeFiberHostComponent`, so it won't be leaked to Fabric.
+      parentInstance._internalFiberInstanceHandleDEV &&
+      // $FlowExpectedError[incompatible-type]
+      // $FlowExpectedError[prop-missing] Don't check via `instanceof ReactNativeFiberHostComponent`, so it won't be leaked to Fabric.
+      childInstance._internalFiberInstanceHandleDEV
+    ) {
+      return doesFiberContain(
+        // $FlowExpectedError[incompatible-call]
+        parentInstance._internalFiberInstanceHandleDEV,
+        // $FlowExpectedError[incompatible-call]
+        childInstance._internalFiberInstanceHandleDEV,
+      );
+    }
+
+    // Means that one instance is from Fabric and other is from Paper.
     return false;
   } else {
     throw new Error('isChildPublicInstance() is not available in production.');