/**
 * Gmail raw message export — RFC 2822 / mbox format.
 *
 * Uses Gmail API `format=raw` to fetch the complete wire-format message.
 * This works for all messages including those with embedded message/rfc822
 * attachments that fail with the attachments.get endpoint.
 */
import type { OAuth2Client } from 'google-auth-library';
/**
 * Fetch a single message as raw RFC 2822 bytes.
 *
 * Uses `format=raw` which returns the complete wire-format message including
 * all headers, body parts, and embedded attachments. This is the reliable
 * path for message/rfc822 embedded emails and nested attachments.
 */
export declare function getMessageRaw(auth: OAuth2Client, messageId: string): Promise<Buffer>;
/**
 * Fetch all messages in a thread as a single mbox file (Buffer).
 *
 * The mbox format is the standard for storing multiple RFC 2822 messages in
 * one file. Each message is preceded by a "From " envelope line and separated
 * from the next by a blank line. Lines in the message body starting with
 * "From " are escaped with ">" (mboxo quoting).
 *
 * @param fromAddress - Used for the mbox envelope "From " line (typically the
 *   authenticated account's email address).
 */
export declare function getThreadMbox(auth: OAuth2Client, threadId: string, fromAddress: string): Promise<Buffer>;
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