安装了node-sass依赖以后出现了问题

Question

  "dependencies": {
    "cnchar-poly": "2.0.8",
    "cnchar": "2.0.8"
  },
  "devDependencies": {
    "@babel/core": "7.8.3",
    "@babel/polyfill": "7.8.3",
    "@babel/preset-env": "7.8.3",
    "babel-loader": "8.0.6",
    "chai": "4.2.0",
    "css-loader": "3.4.2",
    "jest": "25.1.0",
    "node-sass": "^4.13.1",
    "sass-loader": "8.0.2",
    "vue": "2.6.11",
    "vue-loader": "15.8.3",
    "vue-style-loader": "4.1.2",
    "vue-template-compiler": "2.6.11",
    "webpack": "4.41.5",
    "webpack-cli": "3.3.10",
    "webpack-merge": "^4.2.2"
  }

package.json如图所示.

现在不管我按照什么包都会出现在这样的画面：
比如我执行yarn add webpack-dev-server -D

然后就会一直显示失败

导致包安装不上。。。

为什么安装webpack-dev-server还需要build node-sass呢？我明明安装了python 2.7和window-build-tool在环境里了，webpack-dev-server安装了为什么会触发构建node-sass，我的yarn已经切换成淘宝镜像了。。。