diff --git a/src/main/ts/declare.ts b/src/main/ts/declare.ts
--- a/src/main/ts/declare.ts
+++ b/src/main/ts/declare.ts
@@ -186,7 +186,10 @@ function makeGetterName(prop: string) {
 
 interface NodeBindSpec {
     node: string;
-    type: string;
+    type: "attribute" | "innerText" | "textContent" | "innerHTML" | "class" | "toggleClass";
+    attribute?: string;
+
+    className?: string;
 }
 
 /**