Is this like https://github.com/wikimedia/apps-android-wikipedia/blob/master/www/js/actions.js and https://github.com/wikimedia/wikipedia-ios/blob/develop/www/js/clickHandling.js? Which way would you prefer?

@bearND this handles what's in both of those files as well as some new functionality. I don't think either approach should be directly re-used since there's platform-specific js-to-native bridging in each. Instead, the each app's native code calls into js to register the interactionHandler with the appropriate message handler.

On iOS the app would call:
wmf.setInteractionHandler((interaction) => { window.webkit.messageHandlers.interaction.postMessage(interaction); });

On Android (assuming there will be a new JavascriptInterface called InteractionWebInterface that could be used directly) the app would call:
wmf.setInteractionHandler((interaction) => { window.InteractionWebInterface.post(interaction); });

Mentioned in SAL (#wikimedia-operations) [2019-07-02T17:43:34Z] <bsitzmann@deploy1001> Started deploy [mobileapps/deploy@9ca9b0f]: Update mobileapps to 941e14f (T219998 T217352 T219909)

Mentioned in SAL (#wikimedia-operations) [2019-07-02T17:49:24Z] <bsitzmann@deploy1001> Finished deploy [mobileapps/deploy@9ca9b0f]: Update mobileapps to 941e14f (T219998 T217352 T219909) (duration: 05m 49s)