import type { EventEmitter } from "node:events";
type ErrorEventEmitter = Pick<EventEmitter, "on"> & object;
export declare function attachGatewaySocketErrorSink(socket: ErrorEventEmitter | null | undefined, onError?: (error: unknown) => void): void;
export declare function rewriteRedirectLocation(app: {
    id: string;
}, location: string | undefined): string | undefined;
export declare function normalizeOrigin(value: string | undefined): string | undefined;
export declare function escapeHtml(value: string): string;
export {};