How to interact with key-value storage (localStorage) like a queue

localStorageQueue.js

/**
 * Функции для работы со storage, как с очередью.
 */

/**
 * Очистить старые записи.
 * @param tailIndexValue
 * @param nextIndexValue
 */
function free(tailIndexValue, nextIndexValue) {
    var currentTimestamp = Number(new Date());
    while (tailIndexValue != nextIndexValue) {
        // @TODO: использовать dequeue и двигать storage[tailValueKey] и когда он совпадет с storage[nextValueKey] — скинуть их на дефолты
    }
}

module.exports = {
    enqueue: function(value) {
        var tailIndexValue = Number(this.storage[this.tailIndexKey]);
        var nextIndexValue = Number(this.storage[this.nextIndexKey]);

        this.storage[this.name + '_' + nextIndexValue] = JSON.stringify(value);
        this.storage[this.nextIndexKey] = nextIndexValue + 1;

        if (nextIndexValue - tailIndexValue > this.size) {
            free(tailIndexValue, nextIndexValue);
        }
    },

    dequeue: function() {
        var tailIndexValue = Number(this.storage[this.tailIndexKey]);
        var tailValueKey = this.name + '_' + tailIndexValue;
        var tailValue = this.storage[tailValueKey];

        if (tailValue) {
            tailValue = JSON.parse(tailValue);
            delete this.storage[tailValueKey];

            this.storage[this.tailIndexKey] = tailIndexValue + 1;

            if (this.storage[this.tailIndexKey] == this.storage[this.nextIndexKey]) {
                this.storage[this.tailIndexKey] = this.storage[this.nextIndexKey] = 0;
            }

            return tailValue;
        }
    }
};