class Bootsnap::LoadPathCache::Cache

def find(feature)
  reinitialize if (@has_relative_paths && dir_changed?) || stale?
  feature = feature.to_s.freeze
  return feature if absolute_path?(feature)
  return expand_path(feature) if feature.start_with?('./')
  @mutex.synchronize do
    x = search_index(feature)
    return x if x
    # Ruby has some built-in features that require lies about.
    # For example, 'enumerator' is built in. If you require it, ruby
    # returns false as if it were already loaded; however, there is no
    # file to find on disk. We've pre-built a list of these, and we
    # return false if any of them is loaded.
    raise(LoadPathCache::ReturnFalse, '', []) if BUILTIN_FEATURES.key?(feature)
    # The feature wasn't found on our preliminary search through the index.
    # We resolve this differently depending on what the extension was.
    case File.extname(feature)
    # If the extension was one of the ones we explicitly cache (.rb and the
    # native dynamic extension, e.g. .bundle or .so), we know it was a
    # failure and there's nothing more we can do to find the file.
    # no extension, .rb, (.bundle or .so)
    when '', *CACHED_EXTENSIONS
      nil
    # Ruby allows specifying native extensions as '.so' even when DLEXT
    # is '.bundle'. This is where we handle that case.
    when DOT_SO
      x = search_index(feature[0..-4] + DLEXT)
      return x if x
      if DLEXT2
        x = search_index(feature[0..-4] + DLEXT2)
        return x if x
      end
    else
      # other, unknown extension. For example, `.rake`. Since we haven't
      # cached these, we legitimately need to run the load path search.
      raise(LoadPathCache::FallbackScan, '', [])
    end
  end
  # In development mode, we don't want to confidently return failures for
  # cases where the file doesn't appear to be on the load path. We should
  # be able to detect newly-created files without rebooting the
  # application.
  raise(LoadPathCache::FallbackScan, '', []) if @development_mode
end