Function getFiberLabel

docs/external/js/react-dom.development.js:10388–10396

(componentName, isMounted, phase)

  };

  var getFiberLabel = function (componentName, isMounted, phase) {
    if (phase === null) {
      // These are composite component total time measurements.
      return componentName + " [" + (isMounted ? 'update' : 'mount') + "]";
    } else {
      // Composite component methods.
      return componentName + "." + phase;
    }
  };

  var beginFiberMark = function (fiber, phase) {
    var componentName = getComponentName(fiber.type) || 'Unknown';