Problems with babel loader in react-create-app

Question

The Problem

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

LOG:

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! [email protected] start: `react-scripts start`
    npm ERR! Exit status 1
    npm ERR!
    npm ERR! Failed at the [email protected] 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

After what it happened

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

What I've tried

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

Also installed yarn and ran yarn && yarn start.

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

Info that may be helpful

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):

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

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"
  ]
}

Solution 1

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

check the package.json file

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

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

Solution 2

Create a .env file in your project directory and include SKIP_PREFLIGHT_CHECK=true in the file.

Solution 3

On Mac:

Remove the conflicting package from /Users/<yourusername>/node_modules

Solution 4

However, a different version of babel-loader was detected higher up in the tree:

You should delete babel-loader package that was was detected higher up the tree. The output says there is a node_modules folder with babel-loader at..

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

You may be able to delete the C:\Users\user\node_modules directory altogether as well, unless for some reason you have a project rooted there inside /Users/{user}

Solution 5

A few years later, the same issue.

For me, the solution was in my c:/users/myName/node_modules. Remove that node_modules completely and try again.

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