require.js check if unnamed module is specified/defined
34250
Catching module loading errors and processing them
25705
Test if a package (or package option) is loaded
117489
Using the Underscore module with Node.js
35455
How to detect if JavaScript is disabled?
119415
Prevent RequireJS from Caching Required Scripts
19007
How to check if an object is an instance of a namedtuple?
120956
How to check what version of jQuery is loaded?
15693
How to detect existence of a class using SFINAE?
104451
How can I debug require in Ruby 1.9
3840
How can I require an optional Perl module if installed?
82784
How do I get a module path?
37157
Get available modules
110541
How to check whether dynamically attached event listener exists or not?
35675
how to make Correctly a javascript if exist (folder) command?
126201
Trouble combining Require.js and Backbone.js/Underscore.js
53507
Test if executable exists in Python?
79883
Test for presence of specific object or managed package?