[regression] Bad Request: "/foo.svelte.css" should be requested as "/foo.svelte.js"

[Rich-Harris]

In SvelteKit, we inject <link rel="stylesheet" href="/foo.svelte.css"> elements when we server-render pages, to avoid FOUC while foo.svelte.js (which imports foo.svelte.css.proxy.js) loads. As of version 3 this no longer works. Should the Bad Request 404 only apply to requests for /foo.svelte itself?

[FredKSchott]

Taking a look now...

[FredKSchott]

Thanks for catching this, fixed in e63d70f. Preparing a new release now.

[Rich-Harris]

Thank you. Perhaps relatedly, I'm slightly unclear on the renaming rules — it seems that *.svelte becomes *.svelte.js but *.ts becomes *.js? Is there a reason that all non-.js files don't just get the .js added? I'm nervous that the logic I'm adding to massage URLs into the expected form will miss some cases

[FredKSchott]

Yup, that's correct. I posted about the rationale here: #2014 (comment)

If you're looking for a file name transformation helper, we could add one to Snowpack. Your plugins dictate which files Snowpack knows how to build, so it would probably be a safer bet long-term vs. SvelteKit needing to keep its own internal map of what file extension builds to what.

[Rich-Harris]

Ah, understood (sorry, I missed the GitHub mention) — the 1:1 vs 1:N distinction makes sense.

For now we can definitely get by just by appending .svelte with .js — long term, something built into Snowpack would probably feel a bit more robust

[FredKSchott]

Great, issue for prioritized work here: #2263