diff --git a/cloudflare/context.go b/cloudflare/context.go
new file mode 100644
index 0000000..a395bb2
--- /dev/null
+++ b/cloudflare/context.go
@@ -0,0 +1,18 @@
+package cloudflare
+
+import (
+	"context"
+	"syscall/js"
+
+	"github.com/syumai/workers/cloudflare/internal/cfruntimecontext"
+	"github.com/syumai/workers/internal/jsutil"
+)
+
+func WaitUntil(ctx context.Context, task func()) {
+	executionContext := cfruntimecontext.GetExecutionContext(ctx)
+
+	executionContext.Call("waitUntil", jsutil.NewPromise(js.FuncOf(func(this js.Value, args []js.Value) any {
+		task()
+		return nil
+	})))
+}