Function shouldConstruct

docs/index.js:12878–12881

(Component)

  return new FiberNode(tag, pendingProps, key, mode);
}
function shouldConstruct(Component) {
  Component = Component.prototype;
  return !(!Component || !Component.isReactComponent);
}
function createWorkInProgress(current, pendingProps) {
  var workInProgress = current.alternate;
  null === workInProgress