postcssIsolateStyles type issue with inline postcss plugin config in vite configs

[xsjcTony]

Describe the bug

config.ts

export default defineConfig({
  vite: {
    css: {
      postcss: {
        plugins: [
          postcssIsolateStyles({
            includeFiles: [/vp-doc\.css/]
          }),
        ],
      },
    }
})

Reproduction

See above

Expected behavior

No error

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (16) x64 11th Gen Intel(R) Core(TM) i9-11900K @ 3.50GHz
    Memory: 38.35 GB / 63.84 GB
  Binaries:
    Node: 18.16.0 - C:\NodeJS\node.EXE
    Yarn: 1.22.19 - C:\NodeJS\yarn.CMD
    npm: 9.8.1 - C:\NodeJS\npm.CMD
    pnpm: 8.7.0 - C:\NodeJS\pnpm.CMD
  Browsers:
    Edge: Spartan (44.19041.1266.0), Chromium (116.0.1938.62)
    Internet Explorer: 11.0.19041.1566
  npmPackages:
    vitepress: ^1.0.0-rc.9 => 1.0.0-rc.9

Additional context

No response

Validations

• Check if you're on the latest VitePress version.
• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.