import { BillItem } from '../concerns/billItem';
import { Charge } from '../charge';
import { IModifierAttributes } from './interface';
import { ModifiersCollection } from './collection';
/**
 *
 *
 * @export
 * @class Modifier
 * @extends {BillItem}
 */
export declare class Modifier extends BillItem {
    /**
     *
     *
     * @type {Charge}
     */
    private _charge;
    /**
     *
     *
     * @type {number}
     */
    percentRatio: number;
    /**
     *
     *
     * @type {number}
     */
    fixedValue: number;
    /**
     * Creates an instance of Modifier.
     *
     * @param {IModifierAttributes} [attributes={}]
     */
    constructor(attributes?: IModifierAttributes);
    charge: Charge;
    /**
     *
     *
     * @returns {number}
     */
    readonly value: number;
    /**
     *
     *
     * @returns {Boolean}
     */
    delete(): Boolean;
    update(attributes?: IModifierAttributes): boolean;
    toJson(): {};
}
export { ModifiersCollection };