Delayed redux action

delayed.js

export default function delay({ dispatch, getState }) {
  const delayed = {};

  return (next) => {
    return (action) => {
      const actionIndex = (delayed[action.type] || []).indexOf(action.delay);

      if (delayed[action.type] && actionIndex > -1) {
        const delayedActionCreator = delayed[action.type][actionIndex];

        delayed[action.type].splice(actionIndex, 1);

        delayedActionCreator(dispatch, getState, action);
        
        return next(action);
      }

      if (action.delay) {
        if (!delayed[action.until]) {
          delayed[action.until] = [];
        }

        delayed[action.until].push(action.delay);
      }
      
      return next(action);
    }
  }
}

function switchLang(lang) {
  return {
    delay: function (dispatch, getState, action) {
      dispatch({
        type: 'SWITCH_LANG',
        lang: lang
      });
    },
    until: 'DATA_LOADED'
  }
}