webpack.config.js

var path = require('path');
var webpack = require('webpack');
var ExtractTextPlugin = require("extract-text-webpack-plugin");
var CopyWebpackPlugin = require("copy-webpack-plugin");

var cssnext = require('postcss-cssnext');
var nested = require('postcss-nested');
var doiuse = require('doiuse');
var wordwrap = require('wordwrap');

var colors = require('colors');

let sassExtract = new ExtractTextPlugin('styles/app.css');

module.exports = {
  entry: {
    app: ['./src/app.js']
  },
  output: {
    path: require('path').resolve('build'),
    publicPath: '/',
    filename: 'app.js'
  },
  module: {
    preLoaders: [
      {
        test: /\.js$/,
        loader: 'eslint',
        exclude: /node_modules/
      }
    ],
    loaders: [
      {
        test: /\.scss$/,
        loader: sassExtract.extract("css!sass")
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel',
        query: { presets: ['es2015'] }
      }
    ]
  },
  eslint: {
    formatter: require('eslint-friendly-formatter')
  },
  plugins: [
    sassExtract,
    new CopyWebpackPlugin([
      {
        context: 'src',
        from: '**/*.html',
        to: '.'
      }
    ])
  ],
};