warning: "@charset" must be the first rule in the file

[mxp131011]

Describe the bug

vite build hint warning: "@charset" must be the first rule in the file

Reproduction

{
 css: { preprocessorOptions: { scss: { additionalData: `@use "@/styles/index.scss" as *;` } } },
       
 build: {
            cssCodeSplit: true, // 如果设置为false，整个项目中的所有 CSS 将被提取到一个 CSS 文件中
            sourcemap: false, // 构建后是否生成 source map 文件。如果为 true，将会创建一个独立的 source map 文件
            target: 'modules', // 设置最终构建的浏览器兼容目标。默认值是一个 Vite 特有的值——'modules'  还可设置为 'es2015' 'es2016'等
            chunkSizeWarningLimit: 550, // 单位kb  打包后文件大小警告的限制 (文件大于此此值会出现警告)
            assetsInlineLimit: 4096, // 单位字节（1024等于1kb） 小于此阈值的导入或引用资源将内联为 base64 编码，以避免额外的 http 请求。设置为 0 可以完全禁用此项。
            minify: 'terser', // 'terser' 相对较慢，但大多数情况下构建后的文件体积更小。'esbuild' 最小化混淆更快但构建后的文件相对更大。
            terserOptions: {
                compress: {
                    drop_console: true, // 生产环境去除console
                    drop_debugger: true // 生产环境去除debugger
                }
            },
            rollupOptions: {
                output: {
                    manualChunks: { // 拆分代码
                        'vue': ['vue', 'vue-router', 'vuex'], // 如果打包有BUG请屏蔽
                        'element-plus': ['element-plus'],
                        'echarts': ['echarts'],
                        'xlsx': ['xlsx']
                    }
                }
            }
        }
}```

### System Info

```shell
System:
    OS: Windows 10 10.0.22000
    CPU: (4) x64 Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz
    Memory: 10.14 GB / 15.94 GB
  Binaries:
    Node: 16.11.1 - F:\IDE\nodejs\node.EXE
    npm: 8.1.2 - F:\IDE\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.22000.120.0), Chromium (95.0.1020.40)
    Internet Explorer: 11.0.22000.120

Used Package Manager

npm

Logs

warnings when minifying css:
 > <stdin>:9:0: warning: "@charset" must be the first rule in the file
    9 │ @charset "UTF-8";
      ╵ ~~~~~~~~
   <stdin>:2:0: note: This rule cannot come before a "@charset" rule
    2 │ .svg-icon[data-v-77dc9f44] {
      ╵ ^

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/vue-next instead.
• 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.

[yinchengnuo]

vite.config:
css: { preprocessorOptions: { scss: { charset: false } } }

[mxp131011]

Thank you. That's very useful