diff --git a/modules/compiler-core/src-2/internals/ExtensionsPlatform.scala b/modules/compiler-core/src-2/internals/ExtensionsPlatform.scala
new file mode 100644
index 0000000..50c3e0f
--- /dev/null
+++ b/modules/compiler-core/src-2/internals/ExtensionsPlatform.scala
@@ -0,0 +1,35 @@
+/* Copyright 2022 Disney Streaming
+ *
+ * Licensed under the Tomorrow Open Source Technology License, Version 1.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    https://disneystreaming.github.io/TOST-1.0.txt
+ *
+ * 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 smithytranslate.compiler
+package internals
+
+import scala.language.reflectiveCalls
+import scala.jdk.CollectionConverters._
+
+trait ExtensionsPlatform {
+  // Using reflective calls because openapi does not seem to have a common interface
+  // that exposes the presence of extensions.
+  type HasExtensions = { def getExtensions(): java.util.Map[String, Any] }
+  object HasExtensions {
+    def unsafeFrom(s: Any): HasExtensions = s.asInstanceOf[HasExtensions]
+  }
+
+  def getExtensions(s: HasExtensions) =
+    Option(s)
+      .flatMap(s => Option(s.getExtensions()))
+      .map(_.asScala)
+      .filterNot(_.isEmpty)
+}
diff --git a/modules/compiler-core/src-3/internals/ExtensionsPlatform.scala b/modules/compiler-core/src-3/internals/ExtensionsPlatform.scala
new file mode 100644
index 0000000..39c819a
--- /dev/null
+++ b/modules/compiler-core/src-3/internals/ExtensionsPlatform.scala
@@ -0,0 +1,36 @@
+/* Copyright 2022 Disney Streaming
+ *
+ * Licensed under the Tomorrow Open Source Technology License, Version 1.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    https://disneystreaming.github.io/TOST-1.0.txt
+ *
+ * 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 smithytranslate.compiler
+package internals
+
+import scala.language.reflectiveCalls
+import scala.jdk.CollectionConverters._
+import reflect.Selectable.reflectiveSelectable
+
+trait ExtensionsPlatform {
+  // Using reflective calls because openapi does not seem to have a common interface
+  // that exposes the presence of extensions.
+  type HasExtensions = { def getExtensions(): java.util.Map[String, Any] }
+  object HasExtensions {
+    def unsafeFrom(s: Any): HasExtensions = s.asInstanceOf[HasExtensions]
+  }
+
+  def getExtensions(s: HasExtensions) =
+    Option(s)
+      .flatMap(s => Option(s.getExtensions()))
+      .map(_.asScala)
+      .filterNot(_.isEmpty)
+}
diff --git a/modules/compiler-core/src/internals/GetExtensions.scala b/modules/compiler-core/src/internals/GetExtensions.scala
index 310c661..d0c7484 100644
--- a/modules/compiler-core/src/internals/GetExtensions.scala
+++ b/modules/compiler-core/src/internals/GetExtensions.scala
@@ -18,27 +18,16 @@ package internals
 
 import software.amazon.smithy.model.node.Node
 import scala.jdk.CollectionConverters._
-import scala.language.reflectiveCalls
 import smithytranslate.compiler.internals._
 import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.{node => jackson}
 import java.time.format.DateTimeFormatter
 import java.time.ZoneId
 
-private[compiler] object GetExtensions {
-
-  // Using reflective calls because openapi does not seem to have a common interface
-  // that exposes the presence of extensions.
-  type HasExtensions = { def getExtensions(): java.util.Map[String, Any] }
-  object HasExtensions {
-    def unsafeFrom(s: Any): HasExtensions = s.asInstanceOf[HasExtensions]
-  }
+private[compiler] object GetExtensions extends ExtensionsPlatform {
 
   def from(s: HasExtensions): List[Hint] =
-    Option(s)
-      .flatMap(s => Option(s.getExtensions()))
-      .map(_.asScala)
-      .filterNot(_.isEmpty)
+    getExtensions(s)
       .map[Hint] { ext =>
         val nodeMap = ext.map { case (k, v) =>
           (k, anyToNode(v))