diff --git a/ts/core/index.ts b/ts/core/index.ts
new file mode 100644
index 0000000..2b16807
--- /dev/null
+++ b/ts/core/index.ts
@@ -0,0 +1,15 @@
+import * as smartenv from '@push.rocks/smartenv';
+
+let usedImplementation: typeof import('../core_base/index.js');
+
+const smartenvInstance = new smartenv.Smartenv();
+
+export const getImplementation = async () => {
+  if (smartenvInstance.isNode) {
+    usedImplementation = await smartenvInstance.getSafeNodeModule<
+      typeof import('../core_node/index.js')
+    >('../core_node/index.js');
+  } else {
+    usedImplementation = await import('../core_fetch/index.js');
+  }
+};