ERR_UNKNOWN_FILE_EXTENSION with css inside dependency #3862
Description
Describe the bug
When a npm dependency imports CSS, vitest's resolution fails with node error ERR_UNKNOWN_FILE_EXTENSION, even with the css option is enabled. The same works fine when the imported CSS file is first-party, so I think it's an error in vitest's module resolution. vite is able to build this fine, but vitest fails.
Previous suggestions to this problem were to use deps.inline, but as this has now been deprecated, I'm looking for better solutions which ideally do not involve whitelisting the dependencies that have CSS imports.
Reproduction
Repo: https://github.com/silverwind/vitest-css.
Dependency vitest-css-test-module is published to npm from the subdirectory.
git clone https://github.com/silverwind/vitest-css
cd vitest-css
npm install
npx vitest
Will fail with
DEV v0.34.1 vitest-css
❯ index.test.js (0)
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FAIL index.test.js [ index.test.js ]
TypeError: Unknown file extension ".css" for node_modules/vitest-css-test-module/index.css
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Serialized Error: { code: 'ERR_UNKNOWN_FILE_EXTENSION' }
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Test Files 1 failed (1)
Tests no tests
Start at 14:30:10
Duration 343ms (transform 36ms, setup 0ms, collect 0ms, tests 0ms, environment 0ms, prepare 99ms)
System Info
System:
OS: macOS 13.4
CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
Memory: 84.09 MB / 16.00 GB
Shell: 5.9 - /usr/local/bin/zsh
Binaries:
Node: 20.3.0 - /usr/local/bin/node
Yarn: 1.22.19 - /usr/local/bin/yarn
npm: 9.7.1 - ~/.npm-global/bin/npm
pnpm: 8.6.2 - ~/.npm-global/bin/pnpm
Browsers:
Chrome: 113.0.5672.126
Chrome Canary: 114.0.5686.0
Firefox Nightly: 113.0a1
Safari: 16.5
npmPackages:
vitest: 0.34.1 => 0.34.1Used Package Manager
npm
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