why remove $on in Vue3
Feb 10th 2021
What problem does this feature solve?
create a second Vue instance as a global event-hub
What does the proposed API look like?
Support Vue.$on Vue.$off just like Vue2.x
Jun 13th 2022
https://v3.vuejs.org/guide/migration/events-api.html#overview
That link broke; here’s a working one: https://v3-migration.vuejs.org/breaking-changes/events-api.html