Webpacker::VERSION not present in v4.2.0

[andywww12]

Guys,

On version 2.1.0 of the gem when running on Webpacker version 4.2.0, the styles aren't getting included because of a guard clause checking for Webpacker::VERSION which doesn't seem to exist on a vanilla 4.2.0 install.

https://github.com/mileszs/wicked_pdf/blob/master/lib/wicked_pdf/wicked_pdf_helper/assets.rb#L174

irb(main):001:0> Webpacker::VERSION
Traceback (most recent call last):
        1: from (irb):1
NameError (uninitialized constant Webpacker::VERSION)
irb(main):002:0>```

[kulas115]

I was investigating this as well and I think the problem here is that webpacker is not required at all. This condition is not met in my case so I also get NameError: uninitialized constant Webpacker::VERSION.

I've tried to comment out that guard clause and put binding.pry there. When running require 'webpacker/version' if defined?(Webpacker) manually it loads webpacker and Webpacker::VERSION is defined and returns the correct version. That in the end yields correct CSS.

Maybe the problem stems from the fact that this require is conditional on defined?(Webpacker) and at this point, it's not defined yet?

[unixmonkey]

Perhaps instead of checking the version there, we check for the existence of the method?

if defined?(asset_pack_url)
  asset_pack_url(source)
else

Does that work for any of you?
If it does, could someone create a pull request?

[filipkis]

This is still an issue and there is potentially addressed by PR #964 which should be merged.