code: function(json) {
          var stats, shaved, kb;
  
          this._showOutputDebug(json.warnings, 'warning', this.console.warn);
          this._showOutputDebug(json.errors, 'error', this.console.error);
  
          if (json.statistics) {
  
              stats = json.statistics;
              shaved = (100 - (stats.compressedSize / stats.originalSize * 100)).toPrecision(3);
              kb = function(bytes) {
                  return Math.round(bytes / 10.24) / 100 + ' KB';
              };
  
              this.console.info();
              this.console.info('      Original', kb(stats.originalSize));
              this.console.info('    Compressed', kb(stats.compressedSize));
              this.console.info('     + GZipped', kb(stats.compressedGzipSize));
              this.console.info('       Reduced', shaved + '%');
              this.console.info();
          }
      }
docs: Show messages from Google Closure Compiler.
  Messages can be tuned on/off by adjusting the `output_info` setting
  @param {Object} json
  @private