node.js - 使用 Npm start 启动项目期间出现项目错误，使用 create-react-app 创建的项目

Question

我使用的是ubantu 16操作系统并且我已经安装了

Node version v10.13.0 and npm version 6.4.1

我正在基于create-react-app创建Reactjs项目.

我已经使用命令创建了项目

sudo npm init react-app my-app

此命令成功创建了 my-app，但是当我使用 npm start 运行项目时my-app 文件夹下的命令我收到以下错误

> my-app@0.1.0 start /home/karan/workspace/1425/my-app
> react-scripts start


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:

  "babel-jest": "23.6.0"

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

  /home/karan/workspace/node_modules/babel-jest (version: 22.4.4) 

Manually installing incompatible versions is known to cause hard-to-debug issues.

If prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project. That will permanently disable this message but you might encounter other issues.

To fix the dependency tree, try following the steps below in the exact order:

  1. Delete package-lock.json (not package.json!) and/or yarn.lock in your project folder.
  2. Delete node_modules in your project folder.
  3. Remove "babel-jest" from dependencies and/or devDependencies in the package.json file in your project folder.
  4. Run npm install or yarn, depending on the package manager you use.

In most cases, this should be enough to fix the problem. If this has not helped, there are a few other things you can try:

  5. If you used npm, install yarn (http://yarnpkg.com/) and repeat the above steps with it instead.
     This may help because npm has known issues with package hoisting which may get resolved in future versions.

  6. Check if /home/karan/workspace/node_modules/babel-jest is outside your project directory.
     For example, you might have accidentally installed something in your home folder.

  7. Try running npm ls babel-jest in your project folder.
     This will tell you which other package (apart from the expected react-scripts) installed babel-jest.

If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project. That would permanently disable this preflight check in case you want to proceed anyway.

P.S. We know this message is long but please read the steps above :-) We hope you find them helpful!

npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! my-app@0.1.0 start: `react-scripts start` npm ERR! Exit status 1 npm ERR!  npm ERR! Failed at the my-app@0.1.0 start script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

因为这显示了与问题相关的

react-scripts start ,"babel-jest": "23.6.0"

但是我是 js 框架(node/npm/react)的新手，这个问题将如何解决，请帮忙？

package.json

{
  "name": "my-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "react-scripts": "2.1.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ]
}

Answer 1

即使您收到 ELIFECYCLE 错误而不是 EACCES，也可能与您使用 sudo 的事实有关运行命令。尝试在不使用 sudo 的情况下再次创建并运行该项目。

关注此guide有关如何操作的更多详细信息。