ModuleNotFoundError with webpack

[ulisesbocchio]

I get a ModuleNotFoundError: Module not found: Error: Cannot resolve module 'alt-utils' when I try to use this library.

I'm importing it connectToStores like this:

import connectToStores from 'alt-utils/lib/connectToStores';

And this is my resolver webpack config:

resolve: {
        modulesDirectories: ['./src', './node_modules'],
        extensions: ['','.js', '.jsx', '.json']
    }, 

Any idea how can I get this to work?
All other imports work as expected

EDIT: The import seems not to be a problem, but the webpack entry configuration:

entry: {
        fetch: 'whatwg-fetch',
        app: path.join(__dirname, './src/index.jsx'),
        vendor: [
            'react',
            'react-dom',
            'react-router',
            'react-router-bootstrap',
            'react-bootstrap',
            'react-bootstrap-date-picker',
            'react-select',
            'react-tagsinput',
            'react-lazyload',
            'react-loader',
            'react-dropzone',
            'react-pdf-js',
            'react-waypoint',
            'alt',
            'alt-utils',
            'alt-container',
            'moment',
            'lodash',
            'three',
            'js-cookie'
        ]
    }

When alt-utils is in that list I get the ModuleNotFoundError error