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  • Nicholas Hoyle thinks this is interesting:

sudo npm install -g webpack

From

Cover of Learning React, 1st Edition

Note

This doesn't work if you have installed the latest webpack (2.5.0) globally. So you should install webpack 2.2.1 and not globally (it is not recommended to install globally, see: https://webpack.js.org/guides/installation/)
Instead run this command:
npm install --save-dev webpack@2.2.1

this is mentioned further down in the text.