node.js - ReferenceError: webpack is not defined -

in webpack app have basic build process that's triggered "npm run build" executes webpack binary , copies index.html in /app /dist. whenever run npm run build referenceerror: webpack not defined when run npm start, starts webpack-dev-server, everything's fine.

this webpack config file:

var extracttextplugin = require('extract-text-webpack-plugin');  var config = {     context: __dirname + '/app',     entry: './index.js',     output: {         path: __dirname + '/app',         filename: 'app.js'     },     module: {         loaders: [             { test: /\.js$/, loader: 'babel', exclude: /node_modules/ },             { test: /\.html$/, loader: 'raw', exclude: /node_modules/ },             { test: /\.scss$/, loader: extracttextplugin.extract('style', 'css!sass'), exclude: /node_modules/}         ]     },     plugins: [         new extracttextplugin('app.css')     ] };  if (process.env.node_env == 'production') {     config.output.path = __dirname + '/dist';     config.plugins.push(new webpack.optimize.uglifyjsplugin()); }  module.exports = config; 

you missing

var webpack = require('webpack'); 

at beginning of file. if want optimize execution bit, can push inside if block of yours.