Deploy trying to install a bad version of Yarn?

[noelrappin]

I'm not completely sure what's going on here, but I'm getting the following output from an attempt to deploy a project with the Webpacker 3.x and Capistrano:

00:07 deploy:assets:precompile
      01 ~/.rvm/bin/rvm default do bundle exec rake assets:precompile
      01 yarn install v0.21.3
      01 [1/4] Resolving packages...
      01 [2/4] Fetching packages...
      01 error @rails/[email protected]: The engine "yarn" is incompatible with this module. Expected version ">=0.25.2".
      01 error Found incompatible module
      01 info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
      01 Webpacker requires Yarn >= 0.25.2 and you are using 0.21.3
      01 Please upgrade Yarn https://yarnpkg.com/lang/en/docs/install/

Both the local machine and the server have Yarn 1.0.1 installed globally, so I'm not sure why the asset precompile is trying to install yarn at all, let alone trying to install a version that is too old?

Has anybody seen anything like this?

[gauravtiwari]

@noelrappin That's just yarn install task: https://github.com/rails/webpacker/blob/master/lib/tasks/webpacker/compile.rake#L30

which is used for installing all dependencies before running webpacker:compile. Are you sure server version is 1.0.1?

[noelrappin]

Server version is 1.0.1, yes.

$ yarn --version
1.0.1

So, a) why is the yarn:install task running, b) why isn't it finding the already installed yarn, and c) why is it installing a version so old that the rest of the system won't run?

[noelrappin]

Hmm, might be an inconsistency with RVM on the server side.

[gauravtiwari]

So, a) why is the yarn:install task running,

For installing dependencies of your JS app: https://github.com/rails/webpacker/blob/master/lib/tasks/webpacker/yarn_install.rake

b) why isn't it finding the already installed yarn,

I am not sure about this one. Perhaps you could debug the version of yarn while deploying? May be it's getting overwritten?

and c) why is it installing a version so old that the rest of the system won't run?

It doesn't install yarn

[noelrappin]

Okay, part of the issue here is a weird server side config for my yarn version, so I'll close this here in deference to the existing issue #405