Function getStateFromUpdate

docs/external/js/react-dom.development.js:12378–12455

(workInProgress, queue, update, prevState, nextProps, instance)

  }

  function getStateFromUpdate(workInProgress, queue, update, prevState, nextProps, instance) {
    switch (update.tag) {
      case ReplaceState:
        {
          var payload = update.payload;

          if (typeof payload === 'function') {
            // Updater function
            {
              enterDisallowedContextReadInDEV();

              if ( workInProgress.mode & StrictMode) {
                payload.call(instance, prevState, nextProps);
              }
            }

            var nextState = payload.call(instance, prevState, nextProps);

            {
              exitDisallowedContextReadInDEV();
            }

            return nextState;
          } // State object


          return payload;
        }

      case CaptureUpdate:
        {
          workInProgress.effectTag = workInProgress.effectTag & ~ShouldCapture | DidCapture;
        }
      // Intentional fallthrough

      case UpdateState:
        {
          var _payload = update.payload;
          var partialState;

          if (typeof _payload === 'function') {
            // Updater function
            {
              enterDisallowedContextReadInDEV();

              if ( workInProgress.mode & StrictMode) {
                _payload.call(instance, prevState, nextProps);
              }
            }

            partialState = _payload.call(instance, prevState, nextProps);

            {
              exitDisallowedContextReadInDEV();
            }
          } else {
            // Partial state object
            partialState = _payload;