因为less-loader的版本过高

"devDependencies": {
    "css-loader": "^4.3.0",
    "less": "^4.1.1",
    "less-loader": "^10.0.0",
    "style-loader": "^1.3.0"
  }

改为:

"devDependencies": {
    ...
    "less-loader": "^6.0.0"
  }

重新npm install

重启 

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