packageManagerCheck

function check_package_manager() {
  current_dir=$(pwd)
  while [ "$(pwd)" != "/" ]; do
    if [ -f "pnpm-lock.yaml" ]; then
      if [ "${1}" != "pnpm" ]; then
        echo "Looks like you're using the wrong package manager, partner!"
        echo "It's pnpm time, cowboy."
        cd "${current_dir}"
        return 1
      fi
      break
    elif [ -f "yarn.lock" ]; then
      if [ "${1}" != "yarn" ]; then
        echo "Uh oh, it looks like you're using the wrong package manager!"
        echo "Time to lasso that dependency with Yarn."
        cd "${current_dir}"
        return 1
      fi
      break
    elif [ -f "package-lock.json" ]; then
      if [ "${1}" != "npm" ]; then
        echo "Whoa there, it looks like you're using the wrong package manager!"
        echo "Time to wrangle those dependencies with npm."
        cd "${current_dir}"
        return 1
      fi
      break
    fi
    cd ..
  done
  cd "${current_dir}"
}

alias npm="check_package_manager npm && npm"
alias yarn="check_package_manager yarn && yarn"
alias pnpm="check_package_manager pnpm && pnpm"

sometimes I fish but mostly I zsh