SSR support (render)

[lmiller1990]

We should support render, for SSR: https://vue-test-utils.vuejs.org/api/#render

[samturrell]

Migrating from vue 2 to vue 3, and this seems to be a missing feature in the test utils. Is this something that is actively planned to be reintroduced?

[cexbrayat]

@samturrell Yes, there is an open PR from a contributor that should land as a first step to support SSR. See #1572

[lmiller1990]

@samturrell if you want to pick up where the original author in #1572 left off, that'd be great! I think we just need to rebase and get his branch green, and we can release something to get feedback and testing.

[freakzlike]

renderToString has been added with #1971
https://test-utils.vuejs.org/guide/advanced/ssr.html

[craigrileyuk]

This is a good addition, but I assume it's an emulated function rather than an adapted version of the proper renderToString function since it fails in a NodeJS envrionment. For example:

// @vitest-environment node

at the top of your test file gets you a ReferenceError: document is not defined from vue-test-utils.esm-bundler.mjs.

[lmiller1990]

Hm, should document be defined in that context? Test Utils assumes document exists.

Any recommendation for how renderToString should be implemented here?