Add conditional rendering

src/nodes/ObjectNode.ts

@@ -19,12 +19,12 @@ export class ObjectNode extends AbstractNode<IObject> {
     })
   }
 
-  transform(value: IObject) {
+  transform(path: Path, value: IObject) {
     if (value === undefined) return undefined
     value = value || {}
     let res: any = {}
     Object.keys(this.fields).forEach(f =>
-      res[f] = this.fields[f].transform(value[f])
+      res[f] = this.fields[f].transform(path.push(f), value[f])
     )
     return res;
   }