It doesn't crash now, but I don't think that I made much progress despite that

weather/imports/ui/dataview.js

@@ -4,8 +4,8 @@ import { WeatherData } from '../api/data.js';
 
 import '../../client/weather.html';
 
-export default Template.body.helpers({
-  current() {
+Template.body.helpers({
+  export function current() {
     return WeatherData.find({});
   },
 });

weather/weather.js

-import '../imports/ui/dataview.js'; //seems to be the problem?
+//import 'imports/ui/dataview.js'; //seems to be the problem?
 
 if (Meteor.isClient) {
     for(var key in LOCATIONS) {