ComponentDetails = r'''  When a VDom element is selected by the user, the assist extracts the selection into the return value of `render` within a new OverReact component declaration:  **EXAMPLE:** ``` ReactElement renderTheFoo() {   return Dom.div()(     'oh hai',     Dom.span()('again'),     Dom.em()(' wow this is a lot we should extract it into a component!'),   ); } ```  **BECOMES:** ``` ReactElement renderTheFoo() {   return Foo()(); }  UiFactory<FooProps> Foo = _$Foo; // ignore: undefined_identifier  mixin FooProps on UiProps {}  