Function createFiberFromElement

code/redux/public/app.js:7206–7290

(element, mode, expirationTime)

}

function createFiberFromElement(element, mode, expirationTime) {
  var owner = null;
  {
    owner = element._owner;
  }

  var fiber = void 0;
  var type = element.type;
  var key = element.key;
  var pendingProps = element.props;

  var fiberTag = void 0;
  if (typeof type === 'function') {
    fiberTag = shouldConstruct(type) ? ClassComponent : IndeterminateComponent;
  } else if (typeof type === 'string') {
    fiberTag = HostComponent;
  } else {
    switch (type) {
      case REACT_FRAGMENT_TYPE:
        return createFiberFromFragment(pendingProps.children, mode, expirationTime, key);
      case REACT_ASYNC_MODE_TYPE:
        fiberTag = Mode;
        mode |= AsyncMode | StrictMode;
        break;
      case REACT_STRICT_MODE_TYPE:
        fiberTag = Mode;
        mode |= StrictMode;
        break;
      case REACT_CALL_TYPE:
        fiberTag = CallComponent;
        break;
      case REACT_RETURN_TYPE:
        fiberTag = ReturnComponent;
        break;
      default:
        {
          if (typeof type === 'object' && type !== null) {
            switch (type.$$typeof) {
              case REACT_PROVIDER_TYPE:
                fiberTag = ContextProvider;
                break;
              case REACT_CONTEXT_TYPE:
                // This is a consumer
                fiberTag = ContextConsumer;
                break;
              case REACT_FORWARD_REF_TYPE:
                fiberTag = ForwardRef;
                break;
              default:
                if (typeof type.tag === 'number') {
                  // Currently assumed to be a continuation and therefore is a
                  // fiber already.
                  // TODO: The yield system is currently broken for updates in
                  // some cases. The reified yield stores a fiber, but we don't
                  // know which fiber that is; the current or a workInProgress?
                  // When the continuation gets rendered here we don't know if we
                  // can reuse that fiber or if we need to clone it. There is
                  // probably a clever way to restructure this.