fix(manifest): use resolved virtual module ID for CSS imports in Vite 8

[waterWang]

Description

Virtual CSS modules (e.g. UnoCSS /__uno.css) have dep.file === null and dep.id starting with \0. Using dep.url (e.g. /__uno.css) in the generated import() call fails in Vite 8 module runner with ERR_DENIED_ID because the URL looks like a nonexistent filesystem path.

Root Cause

In findStylesInModuleGraph, the code stores styles[dep.id] = dep.url for all CSS modules. For virtual modules:

• dep.url = /__uno.css (the URL form, not resolvable as a real file)
• dep.id = \0virtual:uno.css (the resolved virtual module ID)

The generated code does import("/__uno.css?inline") — Vite 8's module runner rejects this ID because it's neither a real file path nor a \0-prefixed virtual module.

Fix

For virtual modules (dep.file === null), use dep.id (the resolved ID) instead of dep.url. wrapId() converts \0virtual:uno.css to /@id/__x00__virtual:uno.css — a safe form that Vite's /@id/ resolution plugin can resolve through the plugin pipeline.

Real CSS files (dep.file is set) keep using dep.url as before.

Related

Fixes #2292

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npm i https://pkg.pr.new/@solidjs/start@2293

commit: 5d74ef5

[brenelz]

@katywings thoughts on this?

[birkskyum]

Upstream tracking is now available at unocss/unocss#5271.

I tested the published package from this PR against the official SolidStart with-unocss template. It still returns HTTP 500 with ERR_DENIED_ID /__uno.css?inline, including with unocss@66.7.5 and vite@8.2.1.

The actual UnoCSS module node is:

{
  id: "/__uno.css",
  url: "/__uno.css",
  file: "/__uno.css"
}

Therefore dep.file === null is false and the new branch never runs. A standards-compliant \0-prefixed virtual CSS control works with unchanged SolidStart 2.0.0, so this is being pursued upstream in UnoCSS. This PR should not be merged as-is.