I have set up a project using Vue 3.2.33 and Vite 2.9.5

I get undefined error when I try to access any global variable or mixin from any vue component. This problem does not occur in scss files.

The import itself appears to be working fine, as any css rules within it are valid.

vite.config.ts：

import { fileURLToPath, URL } from 'url';

import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';

// https://vitejs.dev/config/
export default defineConfig({
    plugins: [vue()],
    resolve: {
        alias: {
            '@': fileURLToPath(new URL('./src', import.meta.url)),
        },
    },
    css: {
        preprocessorOptions: {
            scss: {
                additionalData: '@use "@/styles/variables";',
            },
        },
    },
});

src/styles/_variables.scss：

// breakpoints
$breakpoints: (
    "sm": 576px,
    "md": 768px,
    "lg": 992px,
    "xl": 1200px,
    "xxl": 1400px,
);

@mixin test {
    border: 3px solid red;
}

Usage example:

<style scoped lang="scss">
@use 'sass:map';

.container {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
    @include test; // <- undefined

    &--fluid {
        max-width: 100%;
        width: 100%;
    }
}

$widths: (
    'sm': 540px,
    'md': 720px,
    'lg': 960px,
    'xl': 1140px,
    'xxl': 1320px,
);

@each $breakpoint, $width in $widths {
    @media (min-width: map.get($breakpoints, $breakpoint)) { // <- $breakpoints undefined
        .container {
            max-width: $width;
        }
    }
}
</style>