fix: Reanimated failing when using Worklets as a prefab

.yarn/patches/@react-native-gradle-plugin-npm-0.82.0-10aedc0588.patch

@@ -0,0 +1,15 @@
+diff --git a/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt b/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt
+index 890e61c007d5b3e0a9a69d37ef10e8aa3ce5c6b6..91acd7b2930fedb4eca2461ba99287721ca1f38f 100644
+--- a/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt
++++ b/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt
+@@ -80,7 +80,9 @@ class ReactPlugin : Plugin<Project> {
+         configureRepositories(project)
+       }
+
+-      configureReactNativeNdk(project, extension)
++      if(!project.gradle.startParameter.taskNames.any { it.contains("clean") }) {
++        configureReactNativeNdk(project, extension)
++      }
+       configureBuildConfigFieldsForApp(project, extension)
+       configureDevServerLocation(project)
+       configureBackwardCompatibilityReactMap(project)

package.json

@@ -70,5 +70,8 @@
     "react-native-builder-bob": "0.40.13",
     "shelljs": "0.10.0",
     "typescript": "5.8.3"
+  },
+  "resolutions": {
+    "@react-native/gradle-plugin@npm:0.82.0": "patch:@react-native/gradle-plugin@npm%3A0.82.0#~/.yarn/patches/@react-native-gradle-plugin-npm-0.82.0-10aedc0588.patch"
   }
 }

packages/react-native-reanimated/android/CMakeLists.txt

@@ -45,6 +45,7 @@ file(GLOB_RECURSE REANIMATED_ANDROID_CPP_SOURCES CONFIGURE_DEPENDS
 
 find_package(fbjni REQUIRED CONFIG)
 find_package(ReactAndroid REQUIRED CONFIG)
+find_package(react-native-worklets REQUIRED CONFIG)
 
 add_library(reanimated SHARED ${REANIMATED_COMMON_CPP_SOURCES}
                               ${REANIMATED_ANDROID_CPP_SOURCES})
@@ -69,8 +70,7 @@ target_include_directories(
           "${REACT_NATIVE_DIR}/ReactCommon/runtimeexecutor"
           "${REACT_NATIVE_DIR}/ReactCommon/jsiexecutor"
           "${REACT_NATIVE_DIR}/ReactCommon/react/renderer/graphics/platform/cxx"
-          "${REACT_NATIVE_WORKLETS_DIR}/Common/cpp"
-          "${REACT_NATIVE_WORKLETS_DIR}/android/src/main/cpp")
+)
 
 set_target_properties(reanimated PROPERTIES LINKER_LANGUAGE CXX)
 
@@ -80,15 +80,6 @@ else()
   set(BUILD_TYPE "release")
 endif()
 
-add_library(worklets SHARED IMPORTED)
-
-set_target_properties(
-  worklets
-  PROPERTIES
-    IMPORTED_LOCATION
-    "${REACT_NATIVE_WORKLETS_DIR}/android/build/intermediates/cmake/${BUILD_TYPE}/obj/${ANDROID_ABI}/libworklets.so"
-)
-
 set_target_properties(reanimated PROPERTIES LINKER_LANGUAGE CXX)
 # remove dead code sections
 set_target_properties(reanimated PROPERTIES LINK_FLAGS "-Wl,--gc-sections")
@@ -108,4 +99,4 @@ target_link_libraries(
   ReactAndroid::jsi
   fbjni::fbjni
   android
-  worklets)
+  react-native-worklets::worklets)

packages/react-native-worklets/android/build.gradle

@@ -150,6 +150,8 @@ apply plugin: "com.android.library"
 apply plugin: "maven-publish"
 apply plugin: "de.undercouch.download"
 
+apply from: "./fix-prefab.gradle"
+
 
 android {
     compileSdkVersion safeExtGet("compileSdkVersion", 34)

packages/react-native-worklets/android/fix-prefab.gradle

@@ -0,0 +1,53 @@
+tasks.configureEach { task ->
+    // Make sure that we generate our prefab publication file only after having built the native library
+    // so that not a header publication file, but a full configuration publication will be generated, which
+    // will include the .so file
+
+    def prefabConfigurePattern = ~/^prefab(.+)ConfigurePackage$/
+    def matcher = task.name =~ prefabConfigurePattern
+    if (matcher.matches()) {
+        def variantName = matcher[0][1]
+        task.outputs.upToDateWhen { false }
+        task.dependsOn("externalNativeBuild${variantName}")
+    }
+}
+
+afterEvaluate {
+    def abis = reactNativeArchitectures()
+    rootProject.allprojects.each { proj ->
+
+        if (proj === rootProject) return
+
+        def dependsOnThisLib = proj.configurations.any { config ->
+            config.dependencies.any { dep ->
+                dep.group == project.group && dep.name == project.name
+            }
+        }
+
+        if (!dependsOnThisLib && proj != project) return
+
+        if (!proj.plugins.hasPlugin('com.android.application') && !proj.plugins.hasPlugin('com.android.library')) {
+            return
+        }
+
+        def variants = proj.android.hasProperty('applicationVariants') ? proj.android.applicationVariants : proj.android.libraryVariants
+        // Touch the prefab_config.json files to ensure that in ExternalNativeJsonGenerator.kt we will re-trigger the prefab CLI to
+        // generate a libnameConfig.cmake file that will contain our native library (.so).
+        // See this condition: https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:build-system/gradle-core/src/main/java/com/android/build/gradle/tasks/ExternalNativeJsonGenerator.kt;l=207-219?q=createPrefabBuildSystemGlue
+        variants.all { variant ->
+            def variantName = variant.name
+            abis.each { abi ->
+                def searchDir = new File(proj.projectDir, ".cxx/${variantName}")
+                if (!searchDir.exists()) return
+                def matches = []
+                searchDir.eachDir { randomDir ->
+                    def prefabFile = new File(randomDir, "${abi}/prefab_config.json")
+                    if (prefabFile.exists()) matches << prefabFile
+                }
+                matches.each { prefabConfig ->
+                    prefabConfig.setLastModified(System.currentTimeMillis())
+                }
+            }
+        }
+    }
+}

yarn.lock

@@ -6964,6 +6964,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@react-native/gradle-plugin@patch:@react-native/gradle-plugin@npm%3A0.82.0#~/.yarn/patches/@react-native-gradle-plugin-npm-0.82.0-10aedc0588.patch":
+  version: 0.82.0
+  resolution: "@react-native/gradle-plugin@patch:@react-native/gradle-plugin@npm%3A0.82.0#~/.yarn/patches/@react-native-gradle-plugin-npm-0.82.0-10aedc0588.patch::version=0.82.0&hash=60e1b9"
+  checksum: 10/493d986f2b23678dacd32a5e20a1c4b94e981b5d1abdf6fd35a9fb195b61900250dabb05d54e64af7e779c5b2e55cb96f431c16db0ba326ae8c0d43c5956616d
+  languageName: node
+  linkType: hard
+
 "@react-native/js-polyfills@npm:0.79.6":
   version: 0.79.6
   resolution: "@react-native/js-polyfills@npm:0.79.6"