import { SmrtObject } from '@happyvertical/smrt-core';
import { AttachmentOptions } from '../types';
export declare class Attachment extends SmrtObject {
    tenantId: string | null;
    messageId: string;
    filename: string;
    contentType: string;
    size: number;
    contentId: string;
    contentDisposition: 'attachment' | 'inline';
    filePath: string;
    sourceUrl: string;
    createdAt: Date;
    constructor(options?: AttachmentOptions);
    /**
     * Get the message this attachment belongs to
     */
    getMessage(): Promise<import('./Message').Message | null>;
    /**
     * Check if attachment is an image
     */
    isImage(): boolean;
    /**
     * Check if attachment is a PDF
     */
    isPdf(): boolean;
    /**
     * Check if attachment is inline (embedded in message body)
     */
    isInline(): boolean;
    /**
     * Get file extension from filename
     */
    getExtension(): string;
    /**
     * Get human-readable file size
     */
    getFormattedSize(): string;
    /**
     * Check if file is stored externally
     */
    hasExternalFile(): boolean;
    /**
     * Read file content (if stored externally)
     *
     * The files SDK is loaded through core's bundler-invisible optional-import
     * boundary so it never enters provider-neutral consumer bundles (#1979).
     * Absence of the SDK at runtime degrades to the existing null contract.
     */
    readContent(): Promise<Buffer | null>;
}
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