brew/Library/Homebrew/extend/os/mac/formula_installer.rb

# typed: strict
# frozen_string_literal: true

module Homebrew
  module OS
    module MacOS
      module FormulaInstaller
        extend T::Helpers

        requires_ancestor { ::FormulaInstaller }

        sig { params(formula: Formula).returns(T.nilable(T::Boolean)) }
        def fresh_install?(formula)
          !Homebrew::EnvConfig.developer? && !::OS::Mac.version.outdated_release? &&
            (!installed_as_dependency? || !formula.any_version_installed?)
        end
      end
    end
  end
end

FormulaInstaller.prepend(Homebrew::OS::MacOS::FormulaInstaller)