class STORAGE {
    /**
     * Reflection class constructor
     * @see https://stackoverflow.com/questions/43431550/async-await-class-constructor
     * @param callback
     * @example
     * var myObj = new myClass();
     * myObj.init(function() {
     *    // inside here you can use myObj
     * });
     */
    init(callback: Function) {
        // do something async and call the callback:
        callback.bind(this)();
    }

    /**
     * get localstorage by key
     * @param key
     */
    get(key: string) {
        if (!this.has(key)) {
            return false;
        }
        const data = localStorage[key];
        try {
            return JSON.parse(data);
        } catch (e) {
            return data;
        }
    }

    /**
     * Set localstorage key value
     * @param key
     * @param value
     */
    set(key: string, value: any) {
        try {
            localStorage.setItem(key, JSON.stringify(value));
        } catch (e) {
            localStorage.setItem(key, value);
        }
    }

    /**
     * Check localstorage key exists
     * @param key
     */
    has(key: string) {
        return !!localStorage[key] && !!localStorage[key].length;
    }

    /**
     * Extend or set localstorage key
     * @param key
     * @param value
     */
    extend(key: string, value: string) {
        if (this.has(key)) {
            const _value = this.get(key);
            jQuery.extend(_value, JSON.parse(JSON.stringify(value)));
            this.set(key, _value);
        } else {
            this.set(key, value);
        }
    }

    /**
     * Remove localstorage key
     * @param key
     */
    remove(key: string) {
        localStorage.removeItem(key);
    }
}

/**
 * localStorage helper
 */
function storage() {
    return new STORAGE();
}