fix(core): update

test/elements/test-demoelement.ts

@@ -20,6 +20,17 @@ enum ETestEnum {
 export class TestDemoelement extends DeesElement {
   public static demo = () => html`<test-demoelement>This is a slot text</test-demoelement>`;
 
+  @property()
+  public notTyped = 'hello';
+
+  @property({
+    type: String,
+  })
+  public typedAndNotInitizalized: string;
+
+  @property()
+  public notTypedAndNotInitizalized: string;
+
   @property({
     type: Boolean,
   })