The domStreams
component property enables you to access Events from your Vue.js templates as Streams insides your subscriptions function. You can then map the Events to other values and stream them back into your Vue.js templates.
Same as the last video. Had to import map from rxjs/operators. Looking at the examples for Vue-rx helped (https://github.com/vuejs/vue-rx/blob/master/example/counter-simple.html)