Sample Redux timer middleware

redux-timer-middleware.js

function timerMiddleware({dispatch, getState}) {
    const timers = {};
    
    

    return next => action => {
        if(action.type == "START_TIMER") {
            const {action, timerName, timerInterval} = action.payload;
            
            clearInterval(timers[timerName]);
            
            timers[timerName] = setInterval( () => {
                dispatch({type : action })                
                
            }, timerInterval);        
        }
        else if(action.type == "STOP_TIMER") {
            const {timerName} = action.payload;
            
            clearInterval(timers[timerName]);
        }
        else {
            return next(action);
        }
    }
}

action.payload.timerInterval => timerInterval, it has already been destructured above.

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