/**
 * Lightweight multi-account support (issue #2).
 *
 * Each `--account <name>` (or `NOTEBOOKLM_ACCOUNT=<name>`) gets its own
 * Chrome profile directory under `<dataDir>/accounts/<slug>/`. Chrome's
 * persistent profile already isolates cookies/state per directory, which
 * is enough for the common case of "two Google accounts, different research
 * notebooks" — no encrypted credential store needed.
 *
 * The function is a no-op when no account flag is present, which preserves
 * the single-profile layout for everyone who never asked for multi-account.
 */
import type { Config } from "../config.js";
export declare function getRequestedAccount(argv?: readonly string[]): string | null;
/**
 * Mutate-in-place (then return) the global `Config` so all downstream paths
 * (Chrome profile, auth state, isolated instances) live below the account
 * sub-tree. Called once during startup, before any browser launch.
 */
export declare function applyAccountToConfig(config: Config, account: string | null): Config;
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