/// /// import browserify = require('browserify'); import envify = require('envify/custom'); import fs = require('fs'); var b = browserify('main.js') , output = fs.createWriteStream('bundle.js'); b.transform(envify({ NODE_ENV: 'development' })); b.bundle().pipe(output); b.transform(envify({ _: 'purge' , NODE_ENV: 'development' }));