import type { BrowserContext } from 'playwright-core';
export declare function normalizeProtocol(protocol: string): string;
export declare function getAllowedProtocols(rawValue?: string | undefined): Set<string>;
export declare function resolveAndAssertAllowedUrl(rawUrl: string, baseUrl?: string, allowedProtocols?: Set<string>): string;
export declare function isAllowedNavigationUrl(rawUrl: string, allowedProtocols?: Set<string>): boolean;
export declare function installProtocolGuard(context: BrowserContext, allowedProtocols?: Set<string>): Promise<void>;