Google does it with Inbox. They have Java business logic that they cross-compile to Javascript on the web, ObjC on iOS, and run as-is on Android. The respective UIs are done natively on the respective platforms. (Surprisingly, they do not use GWT for the web UI.)
I guess there is a lot of complex logic in there, the GWT chunk is a good megabyte or so, if I remember right. I think it's all syncing and conflict resolution stuff, but it's hard to tell for sure. (GWT code is optimized/compacted enough that I only have the string constants to go on.)
I guess there is a lot of complex logic in there, the GWT chunk is a good megabyte or so, if I remember right. I think it's all syncing and conflict resolution stuff, but it's hard to tell for sure. (GWT code is optimized/compacted enough that I only have the string constants to go on.)