next-urql's ssr doesn't work with Next 12.1.5

[arcanis]

Steps to reproduce

Clone https://github.com/arcanis/next-bug-context-ssr, run yarn && yarn next dev, and open localhost. It will crash. If you run yarn add next@12.1.5-canary.1 before restarting the server, it'll work.

I'm not sure if the actual problem comes from Next having a regression, or next-urql doing something bad, so I figured I should open an issue on both trackers - the Next.js counterpart is vercel/next.js#36198.

Expected behavior

Should work.

Actual behavior

I have some contexts defined inside layout components (using a pattern similar to the one described here), and since this upgrade those contexts are missing in the SSR build, crashing the direct page load (navigating to the page client-side works fine). It's almost as if pages were built without the _app wrapper.

[pdong]

I ran into the same issue as you and narrowed it down to a change in canary.1 and canary.2 as well. I was able to get it working by disabling Suspense in urql via the options in withUrqlClient. e.g.

{ ssr: true, neverSuspend: true }

I haven't dug into it too much but it seems like something changed in Next that is causing prepass to maybe not be catching errors anymore? LMK if neverSuspend fixes your issue; it seems to have resolved my inability to access context when doing SSR

[arcanis]

The problem seems to have been a regression now fixed in Next; it's not released yet, but I had success building a fresh next package off their main branch and referencing it via a file: dependency.