angular2.js vs angular2.dev.js

Question

I was wondering about the differences between angular2.js and angular2.dev.js, of course there are more files like: router.dev.js and router.js and more, my question is why there are 2 versions and what is the differences between them?

Answer 1

angular2.dev.js uses global.Zone.longStackTraceZone = require('../zones/long-stack-trace.js') via zone.js for showing long stacktrace for angular exceptions to help with your development.

Source: https://code.angularjs.org/2.0.0-alpha.28/angular2.dev.js

Line 1984 to Line 2089

Answer 2

There are actually three versions of angular2.js along with three files for each dependency. There is the regular prod version of each (angular2.js), a minified prod version (angular2.min.js) and a development version (angular2.dev.js). Check out this link to see how the files can be bundled: Bundles, their content and usage scenarios