Gem::BundlerVersionFinder.bundler_version

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/bundler_version_finder.rb, line 6
def self.bundler_version
  bcv = bundle_config_version
  return if bcv == "system"

  v = ENV["BUNDLER_VERSION"]
  v = nil if v&.empty?

  v ||= bundle_update_bundler_version
  return if v == true

  v ||= bcv unless bcv == "lockfile"

  v ||= lockfile_version
  return unless v

  # A config file is arbitrary YAML, so BUNDLE_VERSION can be a date, a
  # mapping, or anything else the parser makes of an unquoted scalar. None
  # of those name a version, and refusing to prioritize is better than
  # raising out of every command that resolves bundler by name.
  return unless Gem::Version.correct?(v)

  Gem::Version.new(v)
end