ERROR in Cannot find module 'babel-core'. using react.js, webpack, and express server

Question

Whenever I run webpack in the terminal I get:

Hash: efea76b1048c3a97b963
Version: webpack 1.12.13
Time: 33ms
    + 1 hidden modules

ERROR in Ca         


        

Answer 1

You should install babel-loader and babel-core as dev-dependency while npm install.

npm install babel-core babel-loader --save-dev

Answer 2

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

Answer 3

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

Answer 4

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.

Answer 5

npm install babel-register

This can solve your issue. Additionally, add babelrc .babelrc { "presets" : ["es2015", "react"] }