Cachegroups issuer and the ModuleGraph

[saivan]

It seems that cacheGroups.issuer has been deprecated in favor of the module graph, but I can't seem to figure out how to use it. If I have:

optimizations: {
  splitChunks: {
    cacheGroups: {
      myGroup: {
        name (module, chunks) {
          module.issuer
        }
      }
    }
  }
}

I get a prompt to use the ModuleGraph api, but I have no idea how I would find the issuer of this particular module with this api. Is there some easy way to do this? Thanks in advanced