export declare class Set<T> {
    private _set;
    private _size;
    constructor();
    /**
     * Adds the given value at the given key
     * @param {string} key   [description]
     * @param {T}      value [description]
     */
    add(key: string | number, ...value: T[]): void;
    /**
     * Private add method
     * @param {string|number} key   [description]
     * @param {T}             value [description]
     */
    private _add(key, value);
    /**
     * Gets the value at the given key
     * @param  {string|number} key [description]
     * @return {T}                 [description]
     */
    get(key: string | number): T[];
    /**
     * Returns the first item in the set of items at the given key
     * @param  {string|number} key The key to retrieve
     * @return {T}                 The first item in the set of items
     */
    first(key: string | number): T;
    /**
     * Sets the given value at the given key
     * @param {string|number} key   [description]
     * @param {T}             value [description]
     */
    set(key: string | number, value: T): void;
    /**
     * Removes the value at the given key
     * @param  {string|number} key [description]
     * @return {T}                 [description]
     */
    remove(key: string | number): T;
    /**
     * Pops the last item off of the set of items at the given key
     * @param  {string|number} key The key for the set to pop
     * @return {T}                 The item popped off the end of the set
     */
    pop(key: string | number): T;
    /**
     * Reveals the last item in the list for the given key
     * @param  {string|number} key The key to check for
     * @return {T}                 The last item in the list
     */
    peek(key: string | number): T;
    /**
     * Empties the set
     */
    empty(): void;
    /**
     * The size of the set
     * @return {number} [description]
     */
    size(key?: string | number): number;
    /**
     * Executes the given predicate for each item in the set
     * @param {Function} predicate [description]
     */
    forEach(predicate: Function): void;
    /**
     * Iterates over each item in the set belonging to the given key
     * @param {string|number} key       The key to iterate through
     * @param {Function}      predicate The function to call for each item
     */
    each(key: string | number, predicate: Function): void;
    /**
     * Returns whether the given key exists in the set
     * @param {string|number} key [description]
     */
    exists(key: string | number): boolean;
    /**
     * Returns whether or not a value exists (non-null and non-undefined) at
     * the given key
     * @param {string|number} key [description]
     */
    hasValue(key: string | number): boolean;
    toList(): any;
    /**
     * Returns the list as json
     * @return {any} A valid json object
     */
    toJson(): any;
    /**
     * Deserializes the given json and populates the set.
     * @param {any} json The json to deserialize
     */
    fromJson(json: any): void;
}