/**
 * Typed event bus for internal email events.
 *
 * Decouples the IMAP IDLE watcher from MCP notification hooks.
 * Uses Node's built-in EventEmitter with typed event maps.
 */
import { EventEmitter } from 'node:events';
import type { EmailMeta } from '../types/index.js';
export interface NewEmailEvent {
    account: string;
    mailbox: string;
    emails: EmailMeta[];
}
/**
 * A message was removed from a mailbox, by this client or another one.
 *
 * `uid` is only present when the server supports QRESYNC — plain IMAP EXPUNGE
 * reports a sequence number, which is not a stable identity. Consumers that
 * key on UID must treat a missing `uid` as "resynchronize this mailbox"
 * rather than "nothing happened".
 */
export interface ExpungeEvent {
    account: string;
    mailbox: string;
    uid?: number;
    seq?: number;
}
/**
 * Flags changed on a message, possibly from another client.
 *
 * As with {@link ExpungeEvent}, `uid` is absent unless the server supplied it.
 * A consumer that cannot identify the message must resynchronize the mailbox
 * rather than assume its cached flags are still correct.
 */
export interface FlagsEvent {
    account: string;
    mailbox: string;
    uid?: number;
    seq: number;
    flags: string[];
}
/**
 * An IMAP connection was replaced. Anything derived from the previous
 * connection — capability probes, per-account memos, mailbox watermarks —
 * must be revalidated, since the account may now be talking to a different
 * server or a recreated mailbox.
 */
export interface ReconnectEvent {
    account: string;
}
/**
 * A mailbox was modified by THIS process — a flag write, move, or delete
 * acknowledged by the server.
 *
 * Deliberately separate from the watcher's `email:new`/`email:flags` events:
 * those carry notification semantics (hooks react to them), while this one
 * exists purely so the local mirror resynchronizes before the next read.
 */
export interface MailboxChangedEvent {
    account: string;
    mailbox: string;
}
interface EmailEventMap {
    'email:new': [NewEmailEvent];
    'email:expunge': [ExpungeEvent];
    'email:flags': [FlagsEvent];
    'email:changed': [MailboxChangedEvent];
    'imap:reconnect': [ReconnectEvent];
}
export declare class EmailEventBus extends EventEmitter<EmailEventMap> {
}
/** Singleton event bus shared across the application. */
declare const eventBus: EmailEventBus;
export default eventBus;
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