redux-lifesaver

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lifesaver is a middleware that keeps track of how many times actions of the same type are dispatched within a given period. If a single action type is dispatched more times than the allowed amount within a given period, subsequent dispatches of that action type will be blocked from the reducer for the same period. At the end of the period, the most recently attempted dispatch of that action type will go through.

import { createStore, applyMiddleware } from 'redux';
import lifesaver from 'redux-lifesaver';
import rootReducer from './reducers/index';

// Note: this API requires redux@>=3.1.0
const store = createStore(
  rootReducer,
  applyMiddleware(lifesaver())
);

lifesaver accepts a configuration object with four optional properties, dispatchLimit, limitDuration, actionTypes, and actionCreator. Where dispatchLimit is the number of dispatches allowed for a single action type in a given period, and limitDuration is the duration of that period in milliseconds. dispatchLimit defaults to 10, and limitDuration to 100. actionTypes should be an object with keys that are action types that you want to have a special configuration. The values are objects that contain dispatchLimit and/or limitDuration. For instance, if you had a VERY_SPECIAL_ACTION that shouldn't be limited at all, your configuration object may look like this:

import { VERY_SPECIAL_ACTION } from './path/to/my/duck';

const lifesaverConfig = {
  actionTypes: {
    [VERY_SPECIAL_ACTION]: {
      limitDuration: 0,
    },
  },
};

actionCreator will replace the action creator that lifesaver dispatches when it throttles an action. This can be handy if you are using thunks and want to do something outside your reducer when an action is throttled. For instance:

import { actionThrottled } from 'redux-lifesaver';
import { reportError, REPORT_ERROR } from './some/path';

const actionCreator = (action) => (dispatch) =>
  dispatch(reportError({
    message: `Over exuberant dispatching of ${action.type}, throttling`,
    data: action,
  })).then(() => dispatch(actionThrottled(action)));

const lifesaverConfig = {
  actionCreator,
  actionTypes: {
    [REPORT_ERROR]: {
      limitDuration: 0,
    },
  },
};

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License

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