fix(engine): define setter along with getter in global html attr (#277)

* fix(engine): define setter along with getter in global html attr

* wip: fix lint, update comment

* wip: dummy commit to re-run Best

packages/lwc-engine/src/framework/html-element.ts

@@ -346,10 +346,11 @@ if (process.env.NODE_ENV !== 'production') {
                 console.log(msg.join('\n')); // tslint:disable-line
                 return; // explicit undefined
             },
+            // a setter is required here to avoid TypeError's when an attribute is set in a template but only the above getter is defined
+            set() {}, // tslint:disable-line
             enumerable: false,
         });
     });
-
 }
 
 freeze(LWCElement);