[Bug]: CSS files in the public directory will cause the build to fail

[iwtem]

Version

System:
    OS: Linux 6.1 Debian GNU/Linux 12 (bookworm) 12 (bookworm)
    CPU: (2) x64 AMD EPYC
    Memory: 1.80 GB / 4.01 GB
    Container: Yes
    Shell: Unknown
  npmPackages:
    @rsbuild/core: 1.0.7 => 1.0.7 
    @rsbuild/plugin-react: 1.0.2 => 1.0.2

Details

这两天将 rsbuild 从 0.7.3 升级到 1.0.7 最后一个版本，正常本地开发没什么问题，在执行 rsbuild build 命令进行打包的时候一直报错，错误如下：

> RUST_BACKTRACE=full rsbuild build
  Rsbuild v1.0.7

Panic occurred at runtime. Please file an issue on GitHub with the backtrace below: https://github.com/web-infra-dev/rspack/issues
Message:  internal error: entered unreachable code
Location: index.crates.io-6f17d22bba15001f/lightningcss-1.0.0-alpha.58/src/values/color.rs:3225
Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 1: _napi_register_module_v1
    at <unknown source file>
 2: _napi_register_module_v1
    at <unknown source file>
 3: _napi_register_module_v1
    at <unknown source file>
 4: _napi_register_module_v1
    at <unknown source file>
 5: _wasmer_vm_f64_nearest
    at <unknown source file>
 6: _wasmer_vm_f64_nearest
    at <unknown source file>
 7: _blake3_compress_in_place_portable
    at <unknown source file>
 8: _blake3_compress_in_place_portable
    at <unknown source file>
 9: _blake3_compress_in_place_portable
    at <unknown source file>
10: _blake3_compress_in_place_portable
    at <unknown source file>
11: _blake3_compress_in_place_portable
    at <unknown source file>
12: _blake3_compress_in_place_portable
    at <unknown source file>
13: _blake3_compress_in_place_portable
    at <unknown source file>
14: _blake3_compress_in_place_portable
    at <unknown source file>
15: _blake3_compress_in_place_portable
    at <unknown source file>
16: _napi_register_module_v1
    at <unknown source file>
17: _napi_register_module_v1
    at <unknown source file>
18: _napi_register_module_v1
    at <unknown source file>
19: _napi_register_module_v1
    at <unknown source file>
20: _napi_register_module_v1
    at <unknown source file>
21: _napi_register_module_v1
    at <unknown source file>
22: _napi_register_module_v1
    at <unknown source file>
23: _napi_register_module_v1
    at <unknown source file>
24: _napi_register_module_v1
    at <unknown source file>
25: _napi_register_module_v1
    at <unknown source file>
26: _wasmer_vm_f64_nearest
    at <unknown source file>
27: _napi_register_module_v1
    at <unknown source file>
28: _napi_register_module_v1
    at <unknown source file>
29: _napi_register_module_v1
    at <unknown source file>
30: _napi_register_module_v1
    at <unknown source file>
31: _napi_register_module_v1
    at <unknown source file>
32: _napi_register_module_v1
    at <unknown source file>
33: _napi_register_module_v1
    at <unknown source file>
34: _wasmer_vm_f64_nearest
    at <unknown source file>
35: _napi_register_module_v1
    at <unknown source file>
36: _napi_register_module_v1
    at <unknown source file>
37: _napi_register_module_v1
    at <unknown source file>
38: __pthread_deallocate
    at <unknown source file>
 ELIFECYCLE  Command failed.

一直以为是 lightningcss 的问题，但是把 lightningcss loader 禁用掉仍然报这个错误。经过一番努力发现把 rsbuild 配置中的 output.copy 去掉，打包就成功了，然后继续排查该目录，最终锁定在某个 css 文件中的几行代码，去掉 color-mix 那行即可打包成功。

.textLayer ::selection{
  background:rgba(0 0 255 / 0.25);
  background:color-mix(in srgb, AccentColor, transparent 75%);
}

但是 public 目录不是单纯的复制吗，也会经过编译这一步骤？

Reproduce link

https://codesandbox.io/p/devbox/4wyjt5

Reproduce Steps

1. 打开控制台
2. 执行 pnpm build

[iwtem]

当然不局限于打包这个命令，正常的本地开发，在 css 中添加上述出现问题的样式，同样也会报一样的错误。

[chenjiahan]

There are two issues here:

• The copied module should not be processed by lightningcss.
• Lightningcss should not panic.