fix(core): update

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstream',
-  version: '3.0.6',
+  version: '3.0.7',
   description: 'simplifies access to node streams'
 }

ts/smartstream.classes.passthrough.ts

@@ -13,7 +13,9 @@ export class PassThrough extends plugins.stream.Duplex {
     if (this.push(chunk, encoding)) {
       callback();
     } else {
-      this.once('drain', callback);
+      this.once('drain', () => {
+        callback();
+      });
     }
   }
 }