Redux dependency injection middleware

redux-inject.js

export default function createInjectMiddleware(map) {
    return store => next => action => {
        if (typeof action !== "object"
            || typeof action.payload !== "function"
            || action.meta == null
            || action.meta.inject == null) {
            return next(action);
        }
        
        const defaultInjections = {
            action, store, dispatch: store.dispatch, getState: store.getState
        }
        
        const injections = Object.assign({}, defaultInjections, map);
        
        let argumentMap = action.meta.inject.map(k => injections[k]);
        action.payload(...argumentMap);
    };
}