/**
 * Working out who the session belongs to.
 *
 * Substack refuses to create a draft without `draft_bylines`, and the byline is
 * the numeric user id. The old implementation never sent it, which is the other
 * half of why its drafts came out wrong.
 *
 * SUBSTACK_USER_ID is the fast path. When it is not set we resolve the id once
 * per process and cache it, so the model does not have to make the user go
 * hunting in DevTools for a number we can look up ourselves.
 */
import type { SubstackClient } from "./client.js";
import type { Credentials } from "../config.js";
export declare function resolveUserId(client: SubstackClient, creds: Credentials): Promise<number | undefined>;
/**
 * The `draft_bylines` value Substack expects. Returns undefined when the id
 * could not be resolved, so the caller can send the draft without it rather
 * than failing outright.
 */
export declare function bylinesFor(client: SubstackClient, creds: Credentials): Promise<{
    id: number;
    is_guest: boolean;
}[] | undefined>;