As a workaround you can probably copy GWT's Optional emulation into your own project, add JsInterop annotations and then it should work.
GWT does not place JsInterop annotations on most JRE emulations because the compiler only has an "all-or-nothing" switch (-generatesJsInteropExports). That means all code that can be accessed from the @JsType annotated class can not be pruned because it might be called by external JS. So it would result in a final JS code size increase. But you can make a feature request on Github, as GWT has @JsType some Collections: https://gwt-review.googlesource.com/#/c/15191/ -- J. -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
