In (late) response to Luci's comment in the page above, plugin vue generates two files for this app, http://dev.tiki.org/temp/public/vue_App.js which seems to work fine and is Content-Type: application/javascript and also http://dev.tiki.org/temp/public/vue_todolist.js which appears to be Content-Type: text/plain; charset=utf-8 and fails with a 404 (and yet has a content type??)

The first one is included as a "normal" js file, but the second is included as a module, so presumably something on the server needs fixing to make this work? (i.e. i don't think it's my fault! 😁)