Create refactoring heirarchy

Author: kapunga

core/js/src/main/scala/cats/effect/IOApp.scala

@@ -143,7 +143,7 @@ import scala.util.Try
  * @see
  *   [[IOApp.Simple]]
  */
-trait IOApp {
+trait IOApp extends IOAppPlatform {
 
   private[this] var _runtime: unsafe.IORuntime = null
 

core/js/src/main/scala/cats/effect/IOAppPlatform.scala

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020-2025 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cats.effect
+
+trait IOAppPlatform extends IOAppCommon {}

core/jvm-native/src/main/scala/cats/effect/IOAppMultiThreaded.scala

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020-2025 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cats.effect
+
+trait IOAppMultiThreaded {}

core/jvm/src/main/scala/cats/effect/IOApp.scala

@@ -140,7 +140,7 @@ import java.util.concurrent.atomic.AtomicInteger
  * @see
  *   [[IOApp.Simple]]
  */
-trait IOApp {
+trait IOApp extends IOAppPlatform {
 
   private[this] var _runtime: unsafe.IORuntime = null
 

core/jvm/src/main/scala/cats/effect/IOAppPlatform.scala

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020-2025 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cats.effect
+
+trait IOAppPlatform extends IOAppCommon with IOAppMultiThreaded {}

core/native/src/main/scala/cats/effect/IOApp.scala

@@ -139,7 +139,7 @@ import java.util.concurrent.atomic.AtomicInteger
  * @see
  *   [[IOApp.Simple]]
  */
-trait IOApp {
+trait IOApp extends IOAppPlatform {
 
   private[this] var _runtime: unsafe.IORuntime = null
 

core/native/src/main/scala/cats/effect/IOAppPlatform.scala

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020-2025 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cats.effect
+
+trait IOAppPlatform extends IOAppCommon with IOAppMultiThreaded {}

core/shared/src/main/scala/cats/effect/IOAppCommon.scala

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020-2025 Typelevel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cats.effect
+
+trait IOAppCommon {}