Single Page Application - Knockout extender for Amplify local storage

spa-knockoutExtenderForAmplify.js

ko.extenders.localStore = function (target, key) {
    var value = amplify.store(key) || target();
    var result = ko.computed({
        read: target,
        write: function(newValue) {
            amplify.store(key, newValue);
            target(newValue);
        }
    });
    result(value);
    return result;
};