升级依赖项时反应“TypeError：路径必须是字符串。收到未定义”答案

【问题标题】：React "TypeError: Path must be a string. Received undefined" while upgrading dependencies升级依赖项时反应“TypeError：路径必须是字符串。收到未定义”
【发布时间】：2020-08-14 12:45:25
【问题描述】：

将依赖项升级到最新版本时，我的 mern stack 应用程序崩溃了，我收到了一条 typeError 消息

TypeError：路径必须是字符串。收到未定义

有人可以帮忙吗？提前致谢。这是错误：

TypeError: Path must be a string. Received undefined
at assertPath (path.js:28:11)
at Object.join (path.js:489:7)
at noopServiceWorkerMiddleware (C:\Projects\react-portfolio\comfort-app\node_modules\react-dev-utils\noopServiceWorkerMiddleware.js:14:26)
at Layer.handle [as handle_request] (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:317:13)
at C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:335:12)
at next (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:275:10)
at launchEditorMiddleware (C:\Projects\react-portfolio\comfort-app\node_modules\react-dev-utils\errorOverlayMiddleware.js:20:7)
at Layer.handle [as handle_request] (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:317:13)
at C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:335:12)
at next (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\index.js:275:10)
at handleWebpackInternalMiddleware (C:\Projects\react-portfolio\comfort-app\node_modules\react-dev-utils\evalSourceMapMiddleware.js:42:7)
at Layer.handle [as handle_request] (C:\Projects\react-portfolio\comfort-app\node_modules\express\lib\router\layer.js:95:5)

package.json 文件在这里：


{
  "name": "comfort-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@fortawesome/react-fontawesome": "^0.1.9",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "axios": "^0.19.1",
    "bootstrap": "^4.4.1",
    "cloudinary-core": "^2.8.2",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-redux": "^7.2.0",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.3.0",
    "redux": "^4.0.5",
    "redux-devtools-extension": "^2.13.8",
    "redux-thunk": "^2.3.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

我应该降级到以前版本的 yarn 吗？恐怕如果我这样做，我会得到更多的错误。有什么想法吗？

【问题讨论】：

标签： reactjs redux yarnpkg mern

【解决方案1】：

这是一个bug that was fixed in react-script@3.4.0，将你的package.json中的react-scripts更改为"react-scripts": "3.4.0",并运行yarn install或者你可以这样做：

yarn add react-scripts@3.4.0

【讨论】：

谢谢分数！！！你救了我的命！我对使用问答功能很陌生。我怎么给你信任我的朋友！
很高兴我能帮上忙，你可以upvote and accept the answer
我想知道你试过什么 cmd ？ yarn install ?
我使用了 yarn add react-scripts@3.4.0
哦。我使用了纱线更新 cmd。它告诉我某些东西已被弃用，所以我输入了它建议的 cmd。