signal-desktop/js/views/last_seen_indicator_view.js

(function() {
  'use strict';
  window.Whisper = window.Whisper || {};

  var FIVE_SECONDS = 5 * 1000;

  Whisper.LastSeenIndicatorView = Whisper.View.extend({
    className: 'last-seen-indicator-view',
    templateName: 'last-seen-indicator-view',
    initialize: function(options) {
      options = options || {};
      this.count = options.count || 0;
    },

    increment: function(count) {
      this.count += count;
      this.render();
    },

    getCount: function() {
      return this.count;
    },

    render_attributes: function() {
      var unreadMessages =
        this.count === 1
          ? i18n('unreadMessage')
          : i18n('unreadMessages', [this.count]);

      return {
        unreadMessages: unreadMessages,
      };
    },
  });
})();