When building a custom jQuery (master branch) with this command:

grunt build:*:+core/ready

It will output about the line 47:

define("jquery", function(){});

This produces the error

ReferenceError: define is not defined

'''Why I'm using grunt build?'''

I know that "grunt custom" is the recommended alias, but I'm trying to build a minimum possible jQuery that contains the necessary code for a reliable $(document).ready() .

I want to propose this solution to be part of the upcoming Drupal 8 core, as an alternative to domready solution https://github.com/ded/domready that we are using now

The whole command is :

grunt build:*:+core/ready:+exports/global:-exports/amd:-ajax:-ajax/xhr:-ajax/script:-ajax/jsonp:-css:-deprecated:-dimensions:-effects:-event:-event/alias:-offset:-wrap:-sizzle:-queue:-data:-css:-selector:-traversing:-serialize

This builds a 11Kb size domready solution. 5Kb gzipped

Removing the buggy line mentioned before, it works:

http://jsfiddle.net/WnhWc/2/