what does -P flag mean in firebase deploy command?

I saw this -P flag being used in the firebase deploy command https://cloud.google.com/cloud-build/docs/deploying-builds/deploy-firebase

Visit the url , search "-P"

what I guess from here is that it specifies the folder to deploy , Can you please elaborate !

Solution

It specifies the name of the project to deploy to. It means the same thing as --project. When running firebase --help, you can see it in the first few lines of output:

Usage: firebase [options] [command]

Options:
  -V, --version                                output the version number
  -P, --project <alias_or_project_id>          the Firebase project to use for this command
  -j, --json                                   output JSON instead of text, also triggers
                                               non-interactive mode