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

# typed: strict
# frozen_string_literal: true

module FormulaInstallerMac
  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

FormulaInstaller.prepend(FormulaInstallerMac)