import type { ImapFlow } from '../imap-flow.js';
import type { AppendResponseObject } from '../types.js';
/**
 * Result of an APPEND: the destination, the selected mailbox path at the time of the append,
 * and the UID information the server reported
 */
export interface AppendResult extends AppendResponseObject {
    /** Path of the currently selected mailbox, if any */
    path?: string | undefined;
}
/**
 * Appends a message to a mailbox.
 *
 * @param connection - IMAP connection instance
 * @param destination - Destination mailbox path
 * @param content - Message content (RFC 822 format)
 * @param flags - Message flags to set on the appended message
 * @param idate - Internal date to set for the message
 * @returns Append result with UID info if available, or undefined if preconditions not met
 * @throws {Error} If the APPEND command fails or message exceeds APPENDLIMIT
 */
export default function append(connection: ImapFlow, destination: string | string[], content: Buffer | Uint8Array | string, flags?: string | string[] | undefined, idate?: Date | string | false | undefined): Promise<AppendResult | undefined>;