diff --git a/packages/stdlib/src/async/index.ts b/packages/stdlib/src/async/index.ts
new file mode 100644
index 0000000..e69de29
diff --git a/packages/stdlib/src/async/pool/index.ts b/packages/stdlib/src/async/pool/index.ts
new file mode 100644
index 0000000..4a6125c
--- /dev/null
+++ b/packages/stdlib/src/async/pool/index.ts
@@ -0,0 +1,3 @@
+export type AsyncPoolOptions = {
+  concurrency?: number;
+}
\ No newline at end of file