export declare class Attachment {
    private name;
    private src;
    private key;
    private size;
    constructor(name: string, src: string);
    setSize(size: number): Attachment;
    readonly Src: string;
    readonly Key: string;
    readonly Name: string;
    readonly Size: number;
    private setExtension();
    private setKey();
    toJSON(): any;
}