ERROR in Cannot find module 'babel-core'. using react.js, webpack, and express server
Solution 1
You should install babel-loader and babel-core as dev-dependency while npm install.
npm install babel-core babel-loader --save-dev
Solution 2
For those wanting to use babel-loader 8+: it requires Babel 7.x,, which is to be installed as the '@babel/core' package instead of 'babel-core'. In other words, run:
npm install --save-dev @babel/core
Solution 3
I just meet this error, and solved by installing babel-core. But the interesting is I found babel-core does exist in babel-loader's peerDependencies.
https://github.com/babel/babel-loader/blob/master/package.json
Why peerDependecies not install automatically, after a few searching work I found this in npm blog.
peerDependencies will not automatically install anymore.
Solution 4
Adding to @Chetan's answer on this thread:
I ran into this issue today while following through Dr. Axel Rauschmayer's book here. Per book, babel-loader
should download babel-core
as well. However this is not the case when I tried it out. I think this relates to @theJian's answer.
Since the original package.json already lists babel-loader
as dependency, running the following command resolved the error.
npm install babel-core --save-dev
Solution 5
npm install babel-register
This can solve your issue. Additionally, add babelrc .babelrc { "presets" : ["es2015", "react"] }
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Comments
-
Richard Bustos over 3 years
Whenever I run
webpack
in the terminal I get:Hash: efea76b1048c3a97b963 Version: webpack 1.12.13 Time: 33ms + 1 hidden modules ERROR in Cannot find module 'babel-core'
Here is my webpack.config.js file
module.exports = { entry: './app-client.js', output: { filename: 'public/bundle.js' }, module: { loaders: [ { exclude: /(node_modules|app-server.js)/, loader: 'babel' } ] } }
package.json
{ "name": "react", "version": "1.0.0", "description": "React polling app", "main": "app-client.js", "dependencies": { "babel-loader": "^6.2.2", "bootstrap": "^3.3.6", "express": "^4.13.4", "react": "^0.14.7" }, "devDependencies": {}, "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "", "license": "ISC" }
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andilabs over 6 yearsworked like a charm! rember to add it to your
packag.json
to avoid facing this problem again. Runningnpm install
with flag-S
wiil do the job. -
Eric Hepperle - CodeSlayer2010 over 6 yearsWhy? Can you give some explanation as to why this would work?
-
pguardiario over 5 yearsI'm still getting:
Error: Cannot find module '@babel/core' babel-loader@8 requires Babel 7.x (the package '@babel/core'). If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'
-
Brian Underwood over 5 yearsIt seems like loader v8 needs core v7, but core v7 currently just has a
beta
release, which seems like an oversight from the maintainers. I manually specified7.1.5
forbabel-loader
(the latest version that is out right now) and I'm off and running -
CounterFlame about 5 yearsThen I guess you aren't using babel-loader 8+. I answered this for people who happen to be upgrading/starting a new project but don't realize why it isn't working because of package rename. No need to downvote while it's clearly stated what version it applies to.