/// <reference types="node" />
export declare class Attachment {
    static fromLocalFile(filePath: string, options?: FileAttachmentOptions): AttachmentItem;
    /**
     * Creates an attachment from in-memory data held in a Buffer.
     * You need to specify the filename manually as there is no file path to infer it from.
     */
    static fromBuffer(buffer: Buffer, filename: string, options?: FileAttachmentOptions): AttachmentItem;
}
export declare abstract class AttachmentItem {
}
export interface FileAttachmentOptions {
    /**
     * A custom mime type to enforce on the attachment.
     * Unless the file has an unusual file extension, you are often better
     * off letting the mime type be detected automatically by the server.
     */
    mimeType?: string;
}
export declare class LocalFileAttachment extends AttachmentItem {
    filePath: string;
    options: FileAttachmentOptions;
    static maxFileSize: number;
    buffer: Buffer;
    filename: string;
    constructor(filePath: string, options?: FileAttachmentOptions);
    load(): Promise<void>;
}
export declare class BufferFileAttachment extends AttachmentItem {
    buffer: Buffer;
    filename: string;
    options: FileAttachmentOptions;
    static maxFileSize: number;
    constructor(buffer: Buffer, filename: string, options?: FileAttachmentOptions);
    load(): Promise<void>;
}