[plugin vite:asset] TypeError: The "path" argument must be of type string. Received undefined

[KieranP]

Describe the bug

I get the following error after switching a large Svelte/SCSS application to Rolldown-vite:

[plugin vite:asset]
TypeError: The "path" argument must be of type string. Received undefined
TypeError [PLUGIN_ERROR]: The "path" argument must be of type string. Received undefined
    at basename (node:path:1404:5)
    at Object.assetFileNames (file:///Volumes/Xpand/xpand/node_modules/vite-plugin-ruby/dist/index.js:269:23)
    at PluginContextImpl.getAssetFileNames (file:///Volumes/Xpand/xpand/node_modules/rolldown/dist/shared/src-Dwb_rX9h.mjs:2761:91)
    at PluginContextImpl.emitFile (file:///Volumes/Xpand/xpand/node_modules/rolldown/dist/shared/src-Dwb_rX9h.mjs:2753:51)
    at fileToBuiltUrl (file:///Volumes/Xpand/xpand/node_modules/vite/node_modules/rolldown-vite/dist/node/chunks/dep-BVD1pq3j.js:7861:39)
    at async PluginContextImpl.handler (file:///Volumes/Xpand/xpand/node_modules/vite/node_modules/rolldown-vite/dist/node/chunks/dep-BVD1pq3j.js:7708:19)
    at async plugin (file:///Volumes/Xpand/xpand/node_modules/rolldown/dist/shared/src-Dwb_rX9h.mjs:2942:16)
    at async plugin.<computed> (file:///Volumes/Xpand/xpand/node_modules/rolldown/dist/shared/src-Dwb_rX9h.mjs:3800:12)

Looks like vite-plugin-ruby might be relying on something Rolldown-vite has removed/lost during the changes?

Reproduction

TODO (difficult because it also relies on a configured Ruby on Rails application using vite-plugin-ruby to replicate)

Steps to reproduce

Given the following:

entrypoints/themes/client1.ts

import '@styles/themes/client1.scss'

stylesheets/themes/client1.scss

@use './base';

stylesheets/themes/base.scss

:root {
  --body-font-family: sans-serif;
}

System Info

System:
    OS: macOS 15.5
    CPU: (12) arm64 Apple M3 Pro
    Memory: 127.63 MB / 18.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.15.1 - ~/.asdf/installs/nodejs/22.15.1/bin/node
    Yarn: 4.9.1 - /opt/homebrew/bin/yarn
    npm: 10.9.2 - ~/.asdf/plugins/nodejs/shims/npm
  Browsers:
    Chrome: 137.0.7151.69
    Safari: 18.5
  npmPackages:
    rolldown-vite:  6.3.18

Used Package Manager

yarn

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

I think this needs to be fixed on vite ruby side (ElMassimo/vite_ruby#557 (comment)).