react-create-app中的babel loader问题 [英] Problems with babel loader in react-create-app

问题描述

create-react-app 初始化一个存储库，在该存储库中，babel-loader安装为比所需版本更旧的版本.

create-react-app initializes a repository where babel-loader is installed as an older version than needed.

日志:

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-loader": "8.0.4"

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

  C:\Users\user\node_modules\babel-loader (version: 8.0.2)

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-loader" 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 C:\Users\User\node_modules\babel-loader is outside your project directory.
         For example, you might have accidentally installed something in your home folder.

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

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

    npm ERR! A complete log of this run can be found in:
    npm ERR!     C:\Users\User\AppData\Roaming\npm-cache\_logs\2018-12-13T18_22_47_802Z-debug.log

发生了什么事

$ npx create-react-app reg&&cd reg&&npm start

我试图删除 node_modules 文件夹和 package-lock.json ，然后运行 npm install .

I tried to remove node_modules folder and package-lock.json, then run npm install.

还安装了纱线并运行了 yarn&&纱线开始.

Also installed yarn and ran yarn && yarn start.

我已经重新创建了3次应用，并得到了相同的结果.

I've recreated the app 3 times and got the same result.

节点版本: 10.8.0
NPM版本: 6.5.0
create-react-app/react-scripts: 2.1.1
babel-loader: 8.0.4
全局软件包列表( npm ls --depth = 0 -g ):

Node version: 10.8.0
NPM Version: 6.5.0
create-react-app / react-scripts: 2.1.1
babel-loader: 8.0.4
Global packages list (npm ls --depth=0 -g):

+-- create-react-app@2.1.1
+-- node-gyp@3.6.2
+-- npm@6.5.0
+-- yarn@1.12.3

package.json文件:

package.json file:

{
  "name": "reg",
  "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"
  ]
}

推荐答案

遇到相同的问题，但要花一个小时才能解决当我们运行 npm start 时，您会遇到这种错误，它是此问题的与版本有关的问题.转到node_modules文件夹:

Getting the same issue but given an hour on it get the solution When we run npm start then you got this kind of an error that is version related issues for this issue. Go to node_modules folder:

Project->node_modules->react-scripts->package.json

检查package.json文件

check the package.json file

您得到了:"babel-loader":"8.0.4" 首先删除: Project-> node_modules-> babel-loader 的babel-loader文件夹然后运行 npm i babel-loader@8.0.4 (这取决于您的版本，您可以将其更改为:npm i babel-loader@8.0.5)，这可能是您遇到了webpack问题然后从" Project-> node_modules-> webpack "遵循相同的内容remvoe webpack并重新安装 npm i webpack@4.19.1

there you got : "babel-loader": "8.0.4" first remove : babel-loader folder for Project->node_modules->babel-loader and then run npm i babel-loader@8.0.4 (it is depend on your version you can change it like : npm i babel-loader@8.0.5) after that may be you got webpack issue then follow same thing remvoe webpack from "Project->node_modules->webpack" and reinstall npm i webpack@4.19.1

4.19.1 * webpack的版本可能会有所更改..

4.19.1* webpack's version it may be change..

这篇关于react-create-app中的babel loader问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！