node.js - how to set enviroment variable value in pre-processor in webpack? -


i using webpack 2 , added preprocessor in it. passing node_env variable value command line. in java script able access value preprocessor condition getting failed please let me know how set argument value in preprocessor?

here config file

var debug = process.env.node_env !== "production"; var webpack = require('webpack'); var path = require('path');  module.exports = {   context: path.join(__dirname, "src"),   devtool: debug ? "inline-sourcemap" : null,   entry: "./js/app.js",   module: {     loaders: [       {         test: /\.jsx?$/,         exclude: /(node_modules|bower_components)/,         loader: 'babel-loader!preprocess-loader?+debug',         // query: {         //   presets: ['react', 'es2015'],         //   plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy'],         // }       },       {        test: /\.css$/,        loader: "style-loader!css-loader!sass-loader"      }, {         test: /\.htm?$/,         exclude: /(node_modules|bower_components)/,         loader: 'preprocess-loader?+debug',      }      ]       },   output: {     path: __dirname + "/src/",     filename: "demo.min.js"   },   plugins: debug ? [] : [     new webpack.optimize.dedupeplugin(),     new webpack.optimize.occurenceorderplugin(),     new webpack.optimize.uglifyjsplugin({ mangle: false, sourcemap: false }),    ], };

my app.js

//@if process.env.node_env !=='production' console.log("hi dev") console.log("environment",process.env.node_env) //@endif console.log("this working")

when saw console showing production value of process.env.node_env) if getting failed checked exclude condition working fine

command used run npm start --env.node_env='production' please let me know how access variable in pre processor?

edit 1: mentioned can value not being set in preprocessor

edit 2: getting value undefined added answer way

"dev": "set node_env=dev && webpack-dev-server",


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