import type { Browser, Page } from 'puppeteer';
import type { ServerState, LogFunction } from './types.js';
export declare const DEFAULT_PAGE_ID = "default";
export declare function createState(): ServerState;
export declare function getPage(state: ServerState, pageId: string): Page;
export declare function requireBrowser(state: ServerState): Browser;
/**
 * Apply the session-level defaults captured at launch time (viewport,
 * userAgent, stealth shim) to a page. Used both for the initial blank tab and
 * any later pages — without this, lazy-created pages would skip the launch
 * options entirely.
 */
export declare function applyPageDefaults(page: Page, state: ServerState): Promise<void>;
/**
 * Launch a browser with sane defaults if one isn't already running. Cached
 * in-flight Promise prevents two concurrent calls from each spawning their
 * own Chromium and leaking the loser.
 */
export declare function ensureBrowser(state: ServerState, log: LogFunction): Promise<Browser>;
/**
 * Get a page, creating it on the fly if missing. Cached in-flight Promise
 * per pageId prevents two concurrent calls from each opening a tab and
 * leaking the loser.
 */
export declare function ensurePage(state: ServerState, pageId: string, log: LogFunction): Promise<Page>;
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