import { IElement, IQuantity, QuantityComparatorType } from 'fhirtypes/dist/r4';
import { QuantityBuilder } from '../../builders';
import { Element } from '../base/Element';
import { IValidatable } from '../base/IValidatable';
import { ISerializable } from '../base/ISerializable';
export declare class Quantity extends Element implements IQuantity, IValidatable, ISerializable {
    code: string;
    comparator: QuantityComparatorType;
    system: string;
    unit: string;
    value: number;
    _code: IElement;
    _comparator: IElement;
    _system: IElement;
    _unit: IElement;
    _value: IElement;
    toJson(): any;
    toPrettyString(): string;
    toString(): string;
    validate(): {
        isValid: boolean;
        operationOutcome: import("fhirtypes/dist/r4").IOperationOutcome;
    };
    static builder(): QuantityBuilder;
    constructor(args?: IQuantity);
    protected builderInstance(): QuantityBuilder;
    serialize(): string;
}