Function formatLabel

docs/external/js/react-dom.development.js:10354–10358

(label, warning)

  };

  var formatLabel = function (label, warning) {
    var prefix = warning ? warningEmoji + " " : reactEmoji + " ";
    var suffix = warning ? " Warning: " + warning : '';
    return "" + prefix + label + suffix;
  };

  var beginMark = function (markName) {
    performance.mark(formatMarkName(markName));