code: function getAnonymousWatcherName(ctx) {
      let counter = ctx.__$watch_counter;
      if (!counter) {
          counter = ctx.__$watch_counter = 0;
      }
  
      let handler = createAnonymousWatcherName(counter);
      ctx.__$watch_counter = counter + 1;
      return handler;
  }
docs: Get the available anonymous $watch callback handler name
  
  @inner
  @param {Object} ctx the component instance
  @return {string}