gh pr merge [<number> | <url> | <branch>] [flags]

  -d, --delete-branch   Delete the local and remote branch after merge (default true)
  -m, --merge           Merge the commits with the base branch
  -r, --rebase          Rebase the commits onto the base branch
  -s, --squash          Squash the commits into one commit and merge it into the base branch

      --help              Show help for command
  -R, --repo OWNER/REPO   Select another repository using the OWNER/REPO format