/**
 * Container class of number.
 */
export declare class NumberContainer {
    /**
     * Null object of NumberContainer.
     * @static
     */
    static readonly NULL: NumberContainer;
    /**
     * Containing number value.
     * @member
     */
    value: number;
    /**
     * @constructor
     * @param {number} value
     */
    constructor(value?: number);
    valueOf(): number;
}