A sketch of an approach for making it slightly easier to share elm native modules.

elm-native-wrapper.js

(function ElmNativeWrapper(name, actualNativeModule) {
  var initialised = false;
  window[name] = {
    init: function(appname) {
      // Could use Object.keys(window) here to try and detect if the name is wrong
      
      window[munge(appname) + "$Native_" + name] = actualNativeModule();
      initialised = true;
    }
  }

  setTimeout(function() {
    if (!initialised) {
      console.error("Native module " + name + " was not initialised");
    }
  }, 1000);

  function munge() {
    // TODO
  }
})(
  "ElmFirebase",
  function actualNativeModule() {
    return {
      whatever: "you",
      need: "here"
    };
  }
);

ElmFirebase.init("glenjamin/haxx");