[POC] feat: migrate to Broadcast Channel API

[skjnldsv]

This is a first DIRTY try to support cross-tab event sharing.
Here you can see it work in action (see the favorites list in the navigation):

Peek.27-04-2023.14-42.mp4

Refs

• https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API
• https://github.com/pubkey/broadcast-channel

Issues:

• If you emit complex objects that have bindings to window, it will fail hard.
  e.g. I was emitting a files:legacy-view:initialized with this as data, and the try...catch didn't prevent it from failing. You will get a failed to execute 'postMessage' on 'BroadcastChannel'

@ChristophWurst @nickvergessen @juliushaertl (feel free to loop anyone you'd like to discuss this)

[ChristophWurst]

This should not be the default, right? Most events will still be local to the tab. Do we need a second emit for these cross-tab events?

[nickvergessen]

cc @ShGKme

[ChristophWurst]

This should not be the default, right? Most events will still be local to the tab. Do we need a second emit for these cross-tab events?

Do we lose anything by not making those event global? thinking EDIT: I'm also ok making it local :)

For some events the context is local. E.g. for a sidebar opened event.

[ShGKme]

Do we lose anything by not making those event global?

It seems that most (or just many) of events are local.

Even with global events, it may not work globally, depending on a local data. (mentioned in the PR as complex data issue).

Or the opposite. It works globally, but each tab emits the event, like

1. Open 10 tabs
2. Receive a notification
3. Each tab makes emit()
4. We have 10 notifications

Examples are very "pseudo", but it is very related on the usage.

[ShGKme]

🚀🚀🚀

I think, using the Broadcast channel is a great option, that may improve many things in UX and performance / load.

In some cases moving to a "global" approach would probably require also a data sync or moving some modules to a Shared Worker or Web Locks API to implement Leader pattern. And this update in the event hub is a great start to change the way we work with updates in many apps, and to make it uniformly.

Looking forward for this update 🚀