When my app was much simpler (no routing, all client side Polymer w/ Firebase data back-end) I was pleasantly surprised with how quickly I wrapped up an iOS app with the PhoneGap/Cordova CLI. I simply pointed Cordova to the dart2js'ed results in the /build folder.
Now that my app is more complex (HTML5 pushstate/popstate URL routing, server request/response) I anticipate it'll be more difficult, but I haven't yet tried. I'm not sure how the URL routing in particular will work given its wrapped w/ Cordova, but maybe it just does. I'll get to trying it further down my prio list.
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Woven – together.