hmr does not take effect for config.js

[rxliuli]

Describe the bug

In short, after modifying .vitepress/config.js, the hot update is not triggered

Reproduction

Our package.json

{
  "name": "wiki",
  "version": "1.0.1",
  "main": "index.js",
  "private": true,
  "scripts": {
    "dev": "vitepress dev",
    "build": "vitepress build",
    "serve": "vitepress serve"
  },
  "devDependencies": {
    "markdown-it-disable-url-encode": "^1.0.1",
    "prettier": "^2.3.2",
    "vite-plugin-components": "^0.13.2",
    "vite-plugin-icons": "^0.6.3",
    "vite-plugin-windicss": "^1.2.7",
    "vitepress": "^0.16.1",
    "windicss": "^3.1.7"
  },
  "dependencies": {
    "@iconify/json": "^1.1.391",
    "@vueuse/core": "^6.0.0"
  }
}

Expected behavior

更新 config.js 之后能够自动热更新

System Info

System:
    OS: Windows 10 10.0.19043
    CPU: (16) x64 Intel(R) Core(TM) i7-10875H CPU @ 2.30GHz
    Memory: 31.43 GB / 63.87 GB
  Binaries:
    Node: 14.17.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.11 - C:\Program Files\nodejs\yarn.CMD
    npm: 6.14.13 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.19041.1023.0), Chromium (92.0.902.78)
    Internet Explorer: 11.0.19041.906

Additional context

No response

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