code: function getInitialServerState( initialReducer ) {
  	if ( typeof window !== 'object' || ! window.initialReduxState || isSupportSession() ) {
  		return null;
  	}
  
  	const serverState = deserialize( window.initialReduxState, initialReducer );
  	return pick( serverState, Object.keys( window.initialReduxState ) );
  }
docs: get bootstrapped state from a server-side render