40 lines
1014 B
JavaScript
40 lines
1014 B
JavaScript
// @flow
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import _ from 'lodash';
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import { MiddlewareRegistry, toState } from '../redux';
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import PersistenceRegistry from './PersistenceRegistry';
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/**
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* The delay in milliseconds that passes between the last state change and the
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* persisting of that state in the storage.
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*/
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const PERSIST_STATE_DELAY = 2000;
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/**
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* A throttled function to avoid repetitive state persisting.
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*/
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const throttledPersistState
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= _.throttle(
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state => PersistenceRegistry.persistState(state),
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PERSIST_STATE_DELAY);
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/**
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* A master MiddleWare to selectively persist state. Please use the
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* {@link persisterconfig.json} to set which subtrees of the redux state should
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* be persisted.
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*
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* @param {Store} store - The redux store.
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* @returns {Function}
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*/
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MiddlewareRegistry.register(store => next => action => {
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const oldState = toState(store);
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const result = next(action);
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const newState = toState(store);
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oldState === newState || throttledPersistState(newState);
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return result;
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});
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