Podfile

platform :ios, '10.0'
  # Firebase dependencies
  ### PLACEHOLDER_FOR_HOOK: $NSFirebaseAnalyticsWithoutAdIdSupport
  if defined?($NSFirebaseAnalyticsWithoutAdIdSupport)
    Pod::UI.puts "Using Firebase/AnalyticsWithoutAdIdSupport pod in place of default Firebase/Analytics"

    pod 'Firebase/AnalyticsWithoutAdIdSupport','~>9.6'
  else
    Pod::UI.puts "Using default Firebase/Analytics with Ad Ids. May require App Tracking Transparency. Not allowed for Kids apps."
    Pod::UI.puts "You may set variable `$NSFirebaseAnalyticsWithoutAdIdSupport=true` in Podfile to use analytics without ad ids."
    pod 'Firebase/Analytics','~>9.6'
  end