undefined method `lookup' for Webpacker::Manifest:Class

[beaver1992]

Help us help you! Please choose one:

• My app crashes with react-rails, so I've included the stack trace and the exact steps which make it crash.
• My app doesn't crash, but I'm getting unexpected behavior. So, I've described the unexpected behavior and suggested a new behavior.
• [+] I'm trying to use react-rails with another library, but I'm having trouble. I've described my JavaScript management setup (eg, Sprockets, Webpack...), how I'm trying to use this other library, and why it's not working.
• I have another issue to discuss.

---

After upgrading to Webpacker 3.0 get this error:
'undefined method `lookup' for Webpacker::Manifest:Class'

use with react-rails. Before update everything was good.

[rmosolgo]

Sounds like this library needs some work to support webpacker 3.0 :S

[BookOfGreg]

Not sure what changed, Webpacker::Manifest.lookup is still there @ https://github.com/rails/webpacker/blob/v3.0.0/lib/webpacker/manifest.rb#L25

Edit: It's not a class method anymore, I'm currently researching how to get the current instance of manifest and will PR it in.

[beaver1992]

Webpacker updated the manifest lookup API
rails/webpacker#726

[BookOfGreg]

Found it: Yep they made it a singleton.
I'll PR something in to be compatible with their PR
rails/webpacker#636

rails/webpacker@c895cb6#diff-ccbc9196f591353b07190e7063ca0881R24