react脚本和jest版本24.7.1之间的冲突

Question

用'create-react-app'创建一个反应应用程序后，事情一直很成功。我做了一个有效的反应项目。但现在我正在寻求用开玩笑实现单元测试。

使用npm安装：'npm install --save-dev jest'然后运行：npm ls jest我注意到react-script正在寻找一个非常老的开玩笑版本。

的package.json：

"dependencies": {
"react": "^16.8.1",
"react-dom": "^16.8.1",
"react-redux": "^6.0.0",
"react-scripts": "2.1.5",
"redux": "^4.0.1"
},

"devDependencies": {
"jest": "^24.7.1"
},

"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "jest",
"eject": "react-scripts eject"
}

npm ls是结果：

+-- [email protected]
`-- [email protected]
  `-- [email protected]

npm开始错误：

There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix 
locally.

The react-scripts package provided by Create React App requires a         
dependency:

"jest": "23.6.0"

Don't try to install it manually: your package manager does it 
automatically.
However, a different version of jest was detected higher up in the tree:

C:\Users\userName\sample js codes\redux\songs\node_modules\jest (version: 
24.7.1)

有没有解决这个依赖版本问题的解决方案？

Answer 1

Create-react-app内置Jest，无需另外安装。

您现在有版本冲突，因为您另外安装了它。要修复它，请将更改还原到package.json。