static onPending_(libraryVersion, featureVersion, name, description) {
    // If we were to pass each value to the log call, it would be printed as
    // a comma-separated list. To make the print state appear more natural to
    // the reader, create one string for the message.
    shaka.log.alwaysWarn([
      name,
      'has been deprecated and will be removed in',
      featureVersion,
      '. We are currently at version',
      libraryVersion,
      '. Additional information:',
      description,
    ].join(' '));
  }
@param {!shaka.deprecate.Version} libraryVersion
@param {!shaka.deprecate.Version} featureVersion
@param {string} name
@param {string} description
@private