import { PropertyImpl } from "../interfaces/impl";
import { Property } from "./property";
import { TextValue } from "../values/text";
export declare class Attachment extends Property implements PropertyImpl<TextValue> {
    type: string;
    value: TextValue;
    parameters: {
        Encoding: TextValue | null;
        Filename: TextValue | null;
        FmtType: TextValue | null;
        Value: TextValue | null;
    };
    setValue(value: string): this;
    setParameter(type: string, value: string): this;
    toString(): string;
}