new

# File actionview/lib/action_view/cache_expiry.rb, line 6
      def initialize(watcher,, &block)
        @mutex = Mutex.new
        @watcher_class = watcher
        @watched_dirs = nil
        @watcher = nil
        @previous_change = false

        ActionView::PathRegistry.file_system_resolver_hooks << method(:rebuild_watcher)
      end