[ctvo]

> On versioning: it's 2023 & in most cases, you can solve versioning in other ways than maintaining old API versions indefinitely. For RN there's OTA, for web you just need reload the page or "downgrade" your SPA-links to a classic link to get a new bundle (did an example here https://twitter.com/alexdotjs/status/1627739926782480409)

I would suggest you think more deeply about this problem.

In all the examples you listed there is a population on the new version and the old version, even in the happy case. Distributed systems are not instant, and changes take time to propagate. Publishing a new version of your website / RN bundle to a CDN does not mean all edge locations are serving it. Long lived single page applications (Gmail for example) are not typically refreshed often. For small applications, this may not be an issue -- when your scale is millions of users, the population that now receives a 500 due to a bad request is significant, even if it's seconds or minutes where clients access both versions, but the backend only supports the latest version.

> Also, we'll release tooling to help keeping track of changes in cases where you can't update the clients as easily.

The ease of updating the clients doesn't solve this issue, and avoiding leaking it into your framework because it's messy or introduces constraints won't make it go away.

[alexdotjs]

Thanks for the input! We have thought about it a lot.

The biggest challenge with trpc right now is that the API is transient so it's not obvious when you might be braking clients in flight and that you often can't guarantee perfect sync of deployments as you're rightly pointing out.

Once we have some more tooling around it, you'll be able to get the benefits of a traditional API where you consciously choose when to break the spec, but with the productivity benefits of not having to manually define it. I think that will scale pretty well.