Fastlane file for updating ids, display names, and icons w/ badges in React Native

Fastfile.rb

# this should be the folder name under `ios` for your project
project_name = 'MyProject'

# NOTE: This is meant to be run on CI where it changes everything before building the app.
# Usage:
#   `RN_RELEASE_TYPE=beta fastlane prep_release_type` (on CI these ENV variables should be set via the UI)
#   Available release types: alpha, beta, production (default)
# 
# If you're trying this script out locally, make sure you have ImageMagick installed, and discard the changes via git when you're done.
desc "Updates the app identifier, display name and icon for alpha, beta, and production releases"
lane :prep_release_type do
  # alpha, beta, production
  type = ENV['RN_RELEASE_TYPE'] || 'production'
  next if type == 'production'

  suffix = ENV['RN_BUNDLE_SUFFIX'] || type
  # assumes identifier is defined in Appfile
  app_id = CredentialsManager::AppfileConfig.try_fetch_value(:app_identifier)
  new_app_id = "#{app_id}.#{suffix}"
  display_name = ENV['RN_DISPLAY_NAME'] || type.capitalize

  UI.message "\n\nSetting app identifier to: #{new_app_id}"
  UI.message "\n\nSetting Display Name to: #{display_name}"

  # update ios indentifier and display name
  update_info_plist(
    plist_path: "#{project_name}/Info.plist",
    xcodeproj: "./ios/#{project_name}.xcodeproj",
    display_name: display_name,
    app_identifier: new_app_id
  )
  
  # update android display name
  update_android_strings(
    block: lambda { |strings|
      strings['app_name'] = display_name
    }
  )
  
  # update android suffix
  set_value_in_build(
    app_project_dir: "./android/app",
    key: "applicationIdSuffix",
    value: ".#{suffix}"
  )

  # Add badge to app icon
  # want to add the app version to the icon? try this:
  #  current_version = get_version_number(xcodeproj: "./ios/#{project_name}.xcodeproj", target: project_name) 
  #  add_badge(
  #    shield: "Version-#{current_version}-blue"
  #    shield_scale: 0.75
  #  ) 
  # 
  # See all available options at: https://github.com/HazAT/badge
  UI.message "\n\nUpdating app icon with #{type} badge"

  # ios badge
  add_badge(
    # use dark if your icon is light in color
    # dark: true,
    glob: "/ios/**/*.appiconset/*.{png,PNG}", # note no dot in path
    alpha: type == 'alpha',
    grayscale: type == 'alpha'
  )

  # android badge
  add_badge(
    # use dark if your icon is light in color
    # dark: true,
    glob: "/android/app/src/main/res/**/*.{png,PNG}", # note no dot in path
    alpha: type == 'alpha',
    grayscale: type == 'alpha'
  )
end