Describe the bug

When the template in SFC Vue files has language="pug" specified, it raises [Vue warn]: Component is missing template or render function. and expect nothing to be rendered.

Reproduction

• Clone vitest-ts-pug
• Run npm i && npm run test

System Info

System:
    OS: Linux 4.19 Ubuntu 18.04.4 LTS (Bionic Beaver)
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 8.47 GB / 12.42 GB
    Container: Yes
    Shell: 5.4.2 - /usr/bin/zsh
  Binaries:
    Node: 16.5.0 - /tmp/fnm_multishells/277_1640150130225/bin/node
    Yarn: 1.22.5 - /usr/bin/yarn
    npm: 7.19.1 - /tmp/fnm_multishells/277_1640150130225/bin/npm
  npmPackages:
    @vitejs/plugin-vue: ^2.0.0 => 2.0.1 
    vite: ^2.7.2 => 2.7.4 
    vitest: ^0.0.103 => 0.0.103

Used Package Manager

npm

Logs

No response

Validations

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• Read the Contributing Guidelines.
• Read the docs.
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• The provided reproduction is a minimal reproducible example of the bug.