ReferenceError with latest Jekyll (2.5.3)

[euler0]

With Jekyll 2.5.3, I couldn't build the test site.

      Generating... 
  Liquid Exception: ReferenceError: Can't find variable: global in index.html
jekyll 2.5.3 | Error:  ReferenceError: Can't find variable: global

[drewsberry]

Would you mind running jekyll build --trace? I just updated to 2.5.3 and I'm getting a different, seemingly unrelated error.

[drewsberry]

I think this has to do withthe ExecJS runtime... Which are you using? (If you're not sure, just copy the output of

ruby -e "require 'execjs'; puts ExecJS.runtime.name"

The reason I say this is that your error indicates that the JS runtime can't find global, whereas the error I'm getting is complaining because it can't find assign global.katex because again it can't find global. I think the problem may be with the first line of katex.js, where it says

... "undefined" != typeof window ? window.katex = e() : global.katex = e() ...

[drewsberry]

After further investigation, it seems this is caused by updating Jekyll to 2.5.3 causing ExecJS to update to 2.4.0. This works perfectly with ExecJS == 2.2.2, as before, but 2.3.0 and 2.4.0 both cause problems of the sort you encountered.

I'm not sure whether this is a change in the way ExecJS works or is a bug, but I'll raise an issue upstream. In the meantime I'll specify the version in the Gemfile.

Thanks very much for bringing this to my attention.

[drewsberry]

Upstream issue: rails/execjs#14

[euler0]

@drewsberry Thank you for your investigation!