In Vue 2, we were able to use the power of the global Vue object to create a new Vue instance, and use this instance as an event bus that could transport messages between components and functions without any hassle. We just needed to publish and subscribe to the event bus, and everything was perfect.
This was a good way to transfer data between components, but was an anti-pattern approach for the Vue framework and components. The correct way to transfer data between components in Vue is via a parent-child communication, or state management, also known as state-driven architecture.
In Vue 3, the $on, $off, and $once instance methods were removed. To use an event bus strategy now, it is recommended to use a third-party plugin or framework such as mitt (https://github.com/developit/mitt).
