import type { AttachmentAdapter } from '@assistant-ui/react';
import type { PendingAttachment, CompleteAttachment, Attachment } from '@assistant-ui/react';
/**
 * Generic file attachment adapter that accepts any file type.
 * Files are read as base64 data URLs and sent with their original MIME type.
 */
export declare class SimpleFileAttachmentAdapter implements AttachmentAdapter {
    accept: string;
    add(state: {
        file: File;
    }): Promise<PendingAttachment>;
    send(attachment: PendingAttachment): Promise<CompleteAttachment>;
    remove(_a: Attachment): Promise<void>;
}
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