Middleware & reducer decorator providing cross-cutting concern solution via selectors

gistfile1.txt

export function injectRootState({getState}) {
	return next => action => {
		action = next(action);
		(action.meta || (action.meta = {})).rootState = getState();
		return action;
	}
}

export function withSelectors(...selectors) {
	const reducer = selectors.pop();
	return (state, action) => {
		const {meta: rootState} = action;
		return reducer(state, action, ...selectors.map( sel => sel(rootState) ));
	}
}