Does Vue support reactivity on Map and Set data types?

Vue.js does not support reactivity on Map and Set data types (yet?).

The feature ticket has some discussion and this work around (by user “inca”):

Sets and Maps are not observable by Vue. In order to use those —
either in v-for, or in computed properties, methods, watchers,
template expressions, etc. — you need to create a serializable replica
of this structure and expose it to Vue. Here’s a naive example which
uses a simple counter for providing Vue with information that Set is
updated:

data() {
  mySetChangeTracker: 1,
  mySet: new Set(),
},

computed: {
  mySetAsList() { 
    // By using `mySetChangeTracker` we tell Vue that this property depends on it,
    // so it gets re-evaluated whenever `mySetChangeTracker` changes
    return this.mySetChangeTracker && Array.from(this.mySet);
  },
},

methods: {
  add(item) {
    this.mySet.add(item);
    // Trigger Vue updates
    this.mySetChangeTracker += 1;
  }
}

This illustrates a kinda hacky but 100% working method for making
non-observable data reactive. Still, in real world cases I ended up
with serialized versions of Sets/Maps (e.g. you’d probably want to
store the modified versions of sets/maps in localstorage and thus
serialize them anyway), so no artificial counters/hacks were involved.