interface FetchAttachmentParams {
    accountId: string;
    mailbox?: string;
    uid: number;
    index?: number;
    filename?: string;
}
/**
 * Return the extracted text of one INBOX attachment, addressed by uid plus an
 * optional index or filename. The read-side twin of email-fetch-body: that tool
 * returns the message body, this returns an attachment's content. PDF via
 * pdftotext, text/* by decode; other types report that they cannot be
 * extracted, and a scanned PDF reports its missing text layer, so "no data in
 * the attachment" is never indistinguishable from "the attachment could not be
 * read".
 */
export declare function emailFetchAttachment(params: FetchAttachmentParams): Promise<string>;
export {};
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