import type { SlackAccessor } from '../../../accessor/slack.ts';
import { type FileEvent, type JsonValue, type PathSpec } from '../../../types.ts';
/**
 * Map one Slack Events API delivery onto mount paths.
 *
 * The consumer runs the transport (an HTTP endpoint for the Events API or a
 * Socket Mode websocket), unwraps the `event_callback` envelope and passes the
 * inner event's `type` with its body.
 *
 * Every path this returns is rebuilt with the same functions `readdir` names
 * directories with, which is the reason this lives beside the backend rather
 * than in the consumer: a channel is `<name>__<C-id>` through `makeIdName`, a
 * DM is the *user's* name through `dmDirname`, and the day is bucketed in UTC.
 * Slack shows local time, so a consumer reimplementing the last rule would name
 * tomorrow's directory for a fifth of the day and never see an error, because a
 * notify on a path the mount does not serve evicts nothing.
 *
 * Resolution is the reason this holds state. An event names a channel by id
 * only, and the directory carries the name, so the id has to be resolved
 * through `conversations.info` (plus `users.info` for a DM, whose directory is
 * named after the other person). That is one or two API calls the first time a
 * conversation is seen and none after, against a Slack tier that allows roughly
 * 50 a minute; a stateless mapper would spend a call per message. A rename
 * drops the entry rather than patching it, since the whole subtree moved and
 * the answer is a re-inventory anyway.
 *
 * Three kinds of event map to something coarser than a file, and honestly so. A
 * listing change (a channel created, renamed or archived; a user's profile
 * edited) is UNKNOWN on the container directory, because the entry names
 * themselves changed. A shared file is UNKNOWN on that day's `files` directory,
 * because the rendered filename comes from `fileBlobName` over metadata the
 * notification does not carry, and the accompanying `message` event already
 * refreshes `chat.jsonl`.
 *
 * Two file events are unmapped, and neither is unmappable. A file blob is
 * addressed by the day it was *shared*, and neither event carries a
 * conversation or that day: `file_change` sends only `file_id`, `file_deleted`
 * sends `file_id` and the deletion's own `event_ts`. Asking Slack does not
 * recover it either, since `files.info` on a deleted file answers with the
 * `file_deleted` error. What does recover it is this mount's own index, which
 * stores each blob's Slack id as `IndexEntry.id`, so a reverse lookup names the
 * exact path; and a file the index has never seen is one nothing has cached, so
 * there is nothing to invalidate. The hook simply is not handed the index
 * today. Until it is, both ride the index TTL, which bounds the staleness
 * rather than removing it.
 *
 * `channel_shared` / `channel_unshared` are a third that looks like a gap and
 * is not: they change only the Slack Connect flags on the channel object, never
 * its `name` or `id`, which are the two things the directory is spelled from.
 *
 * Mirrors Python `SlackEventHook` (`core/slack/watch/hook.py`).
 */
export declare class SlackEventHook {
    private readonly accessor;
    private readonly dirs;
    private readonly users;
    constructor(accessor: SlackAccessor);
    /** Display name for a user id, memoized. */
    private userName;
    /** Directory a conversation id maps to, memoized. */
    private resolve;
    /** Mount-relative day directory for a conversation and ts. */
    private dayDir;
    /** One UPDATE per day directory the stamps land in. */
    private transcripts;
    /** One UPDATE on the transcript a conversation and ts name. */
    private transcript;
    /** Map a shared file onto that day's attachment directory. */
    private fileShared;
    toEvents(root: PathSpec, eventType: string, payload: JsonValue): Promise<readonly FileEvent[]>;
}
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