compatibility with sprockets 4

[mischa-s]

A new version of sprockets was recently released which creates the following error

The short term fix is to add gem "sprockets", "~> 3.0" to the gem file but a proper fix will need to be implement https://github.com/rails/sprockets/blob/master/UPGRADING.md#guide-to-upgrading-from-sprockets-3x-to-4x

[joshmcarthur]

@mischa-s this doesn't help you in the short term, but I believe sprockets may not be a thing that is required at all if you're happy to stick with the *_pack_tag helpers, since Webpacker takes care of all this without involving sprockets.

[mischa-s]

thanks I'll have a look at that

[mischa-s]

Also going to leave this here. If it gets merged it will add the option of specifying a custom route for the manifest rails/sprockets-rails#446

[eoinkelly]

Rails 6.0.1 brings in sprockets-rails (>= 2.0.0) as a dependency so we can't really avoid installing it, even if you plan to use webpacker only in the app.

[eoinkelly]

Fixed by PR #13