subscriber.js - mozsearch

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */

"use strict";

function registerStoreObserver(store, subscriber) {

  let oldState = store.getState();

  store.subscribe(() => {

    const state = store.getState();

    subscriber(state, oldState);

    oldState = state;

});

exports.registerStoreObserver = registerStoreObserver;