You can look at the source just like any other js project. It might not look totally clean as a hand-written project, but there are absolutely worse things than looking at compiled coffeescript (cough lodash https://github.com/bestiejs/lodash/blob/master/lodash.js#L38...)
Also, why go out-of-your-way to bash another project? Why didn't you link the hexagonal source you mentioned, which would have been productive, instead of lodash?
That template is source code for a function, it becomes the body of many lodash methods using eval. It's not out of my way, it sits right on top of my personal "ugly code" list; couldn't think of a better (worse?) example.
As I understand it there is no hexagonal source, it's just an architecture.
Also, why go out-of-your-way to bash another project? Why didn't you link the hexagonal source you mentioned, which would have been productive, instead of lodash?