Convert EmptyReactNativeConfig to Kotlin (#42286)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/42286

Convert EmptyReactNativeConfig to Kotlin

Changelog:
[Internal] [Changed] - Convert EmptyReactNativeConfig to Kotlin

Reviewed By: huntie

Differential Revision: D52698594

fbshipit-source-id: c4963ff4edc5054d1b78d1c1858e22eb4ef9279e

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/EmptyReactNativeConfig.java

@@ -1,40 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-package com.facebook.react.fabric;
-
-import androidx.annotation.NonNull;
-import com.facebook.jni.HybridData;
-import com.facebook.proguard.annotations.DoNotStripAny;
-
-/**
- * An empty {@link ReactNativeConfig} that is backed by the C++ implementation where the defaults
- * are store.
- */
-@DoNotStripAny
-public class EmptyReactNativeConfig implements ReactNativeConfig {
-
-  @NonNull private final HybridData mHybridData;
-
-  private static native HybridData initHybrid();
-
-  public EmptyReactNativeConfig() {
-    mHybridData = initHybrid();
-  }
-
-  @Override
-  public native boolean getBool(final String param);
-
-  @Override
-  public native long getInt64(final String param);
-
-  @Override
-  public native String getString(final String param);
-
-  @Override
-  public native double getDouble(final String param);
-}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/EmptyReactNativeConfig.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+package com.facebook.react.fabric
+
+import com.facebook.jni.HybridData
+import com.facebook.proguard.annotations.DoNotStripAny
+
+/**
+ * An empty [ReactNativeConfig] that is backed by the C++ implementation where the defaults
+ * are stored.
+ */
+@DoNotStripAny
+class EmptyReactNativeConfig : ReactNativeConfig {
+    private val mHybridData: HybridData = initHybrid()
+
+    private external fun initHybrid(): HybridData
+
+    external override fun getBool(param: String): Boolean
+    external override fun getInt64(param: String): Long
+    external override fun getString(param: String): String
+    external override fun getDouble(param: String): Double
+}