Webpack - extract-text-webpack-plugin Cannot find module

Question

webpack.config.js

var ExtractTextPlugin = require(\"extract-text-webpack-plugin\");

I immediately receive this error if I just

Answer 1

Do you have webpack module on your project?
If not, install it locally (not globally):

$ npm install webpack [--save-dev]

extract-text-webpack-plugin needs webpack as peer dependency, but npm 3 doesn't install peer dependencies automatically.