Re: jsinterop export method that returns Optional

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.

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