What's the current state of local-cache cross-tab synchronization?

[FezVrasta]

Does urql provide any way to sync local-cache across different tabs of the same application? Is there any example available?

Thanks!

[kitten]

That’s an interesting question. Personally I’d opt for synchronizing responses as they come back from the API which could maybe be a BroadcastChannel on which the tab that actively makes a request publishes the result to, which then other tabs (and hence other instance of e.g. Graphcache can pick up)

They could also elect a leader that actually makes the request if any duplicates occur.

I’d imagine hence that this would be an additional exchange that can be put in front of the fetchExchange to reduce complexity on the caching side.

[FezVrasta]

Thanks for the quick reply! How would your idea work with local cache mutations though?

[kitten]

As those are always based on raw data, especially in Graphcache, we don't have to react to anything but results. Basically we reap the benefits of encouraging a cache that reflects server state at all times.