User blog comment:Kirkburn/Technical Update: June 24, 2015/@comment-24473195-20150624200815/@comment-11733175-20150625070656

The syntax is, note the casing of the prefix.

One thing I'm wondering though is how the loaded modules withing dev wiki modules work. Will the require('Module:Foo') reference a module on dev wiki or will it reference a potentially missing module on the wiki using the dev wiki module?