redux-subscriber/lib/index.js

Subscribe to changes in any part of redux state

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.subscribe = subscribe;

exports.default = function (store) {
    var prevState = store.getState();

    store.subscribe(function () {
        var newState = store.getState();

        Object.keys(subscribers).forEach(function (key) {
            if ((0, _objectPath.get)(prevState, key) !== (0, _objectPath.get)(newState, key)) {
                subscribers[key].forEach(function (cb) {
                    return cb(newState);
                });
            }
        });

        prevState = newState;
    });

    return subscribe;
};

var _objectPath = require('object-path');

var subscribers = {};

function subscribe(key, cb) {
    if (subscribers.hasOwnProperty(key)) {
        subscribers[key].push(cb);
    } else {
        subscribers[key] = [cb];
    }

    // return "unsubscribe" function
    return function () {
        subscribers[key] = subscribers[key].filter(function (s) {
            return s !== cb;
        });
    };
}