npm WARN [email protected] requires a peer of babel-core@^6.0.0 but none was installed

Question

I am trying to install Babel and two other plugins to use with Webpack and Reactjs.

I used this command :

npm i babel-loader babel-preset-es2015 babel-preset-react -S 

which gives me warning messages :

UNMET PEER DEPENDENCY babel-core@^6.0.0 

and this one :

npm WARN [email protected] requires a peer of babel-core@^6.0.0 but none was installed. 

And an error message :

ERROR in Cannot find module 'babel-core' 

How can I fix this ?

Thanks in advance.

Answer 1

The reason behind this is that npm deprecated auto-installing of peerDependencies since npm@3, so required peer dependencies like babel-core and webpack must be listed explicitly in your package.json.

All that you need to do is to install babel-core.

Answer 2

Just added this line:

"babel-core": "^6.0.0", 

to my package.json file (dependency), tried the same command again and the warning message vanished.

EDIT: To get rid of this error:

ERROR in Cannot find module 'babel-core' 

I installed babel-core along with the other plugins using this command:

npm i babel-core babel-loader babel-preset-es2015 babel-preset-react -S