🐛 Bug report

When building a Vue 3 SFC with regular scoped styles, Parcel emits a CSS Modules tree-shaking warning even though CSS Modules are not used.

Reproduction

// ./App.vue

<template>
  <div class="foo">test</div>
</template>

<style scoped lang="scss">
.foo {
  color: red;
}
</style>

Build with:

parcel build --no-cache

Current behavior

Parcel emits:

@parcel/optimizer-css: CSS modules cannot be tree shaken when imported with a default specifier

Instead do: import * as style from "style:./App.vue";

The build itself succeeds.

The project does not use <style module>, only <style scoped>.

There is also no user-written import like:

import style from "style:./App.vue";

so the suggested fix cannot be applied in application code.

Expected behavior

Regular Vue <style scoped> blocks should not trigger a CSS Modules tree-shaking warning.

Environment

• Parcel: 2.16.4
• Vue: 3.5.41
• @parcel/transformer-vue: 2.16.4
• Node.js: v24.13.1
• OS: macOS

Additional information

The warning only appears during the optimized production build.
Using --no-optimize avoids the warning, but disabling optimization is not a desirable workaround.