Document The Vaadin Way for working with service workers

[OlliTietavainenVaadin]

Service workers are useful for cases where extra caching and progressive improvement are needed, such as offline and poor network connectivity situations. Right now, there's no clear way on how service workers should interact with Hilla applications and Hilla endpoints. The Vaadin Way could document opinionated best practices for working here.

Some ideas for topics:

• Working with CSRF tokens in service workers
• Using Google WorkBox - yes, no, sometimes?
• Cache strategies
  • What to cache and what not to
• Passing message events - what to send and what not to send
• How to account for Vaadin specifics in sw.ts
  • message event handling order - should Vaadin's internal messages be handled first?
• Communication between the Hilla app and the service workers
• Constructing callbacks
• Message bus -style communication patterns
  • Example: chat messages that are synchronized in the background and pushed to the UI
• Error handling in service workers

[peholmst]

Is it technically possible to do all this right now, or are there any limitations in Hilla that must be addressed first?

[OlliTietavainenVaadin]

Is it technically possible to do all this right now, or are there any limitations in Hilla that must be addressed first?

Technically yes, but it requires hacky workarounds right now. Related issues:
#2788
#2789
#2790
#2791