import { CorsOptions } from '@nestjs/common/interfaces/external/cors-options.interface';
/**
 * External interface
 * @see https://github.com/socketio/socket.io/blob/master/lib/index.ts
 * @publicApi
 */
export interface GatewayMetadata {
    /**
     * The name of a namespace
     */
    namespace?: string | RegExp;
    /**
     * Name of the path to capture
     * @default "/socket.io"
     */
    path?: string;
    /**
     * Whether to serve the client files
     * @default true
     */
    serveClient?: boolean;
    /**
     * The adapter to use
     * @default the in-memory adapter (https://github.com/socketio/socket.io-adapter)
     */
    adapter?: any;
    /**
     * The parser to use
     * @default the default parser (https://github.com/socketio/socket.io-parser)
     */
    parser?: any;
    /**
     * How many ms before a client without namespace is closed
     * @default 45_000
     */
    connectTimeout?: number;
    /**
     * How many ms without a pong packet to consider the connection closed
     * @default 20_000
     */
    pingTimeout?: number;
    /**
     * How many ms before sending a new ping packet
     * @default 25_000
     */
    pingInterval?: number;
    /**
     * How many ms before an uncompleted transport upgrade is cancelled
     * @default 10_000
     */
    upgradeTimeout?: number;
    /**
     * How many bytes or characters a message can be, before closing the session (to avoid DoS).
     * @default 1e6 (1 MB)
     */
    maxHttpBufferSize?: number;
    /**
     * A function that receives a given handshake or upgrade request as its first parameter,
     * and can decide whether to continue or not. The second argument is a function that needs
     * to be called with the decided information: fn(err, success), where success is a boolean
     * value where false means that the request is rejected, and err is an error code.
     */
    allowRequest?: (req: any, fn: (err: string | null | undefined, success: boolean) => void) => void;
    /**
     * The low-level transports that are enabled
     * @default ["polling", "websocket"]
     */
    transports?: Array<'polling' | 'websocket'>;
    /**
     * Whether to allow transport upgrades
     * @default true
     */
    allowUpgrades?: boolean;
    /**
     * Parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
     * @default false
     */
    perMessageDeflate?: boolean | object;
    /**
     * Parameters of the http compression for the polling transports (see zlib api docs). Set to false to disable.
     * @default true
     */
    httpCompression?: boolean | object;
    /**
     * What WebSocket server implementation to use. Specified module must
     * conform to the ws interface (see ws module api docs). Default value is ws.
     * An alternative c++ addon is also available by installing uws module.
     */
    wsEngine?: string;
    /**
     * An optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
     */
    initialPacket?: any;
    /**
     * Configuration of the cookie that contains the client sid to send as part of handshake response headers. This cookie
     * might be used for sticky-session. Defaults to not sending any cookie.
     * @default false
     */
    cookie?: any | boolean;
    /**
     * The options that will be forwarded to the cors module
     */
    cors?: CorsOptions;
    /**
     * Whether to enable compatibility with Socket.IO v2 clients
     * @default false
     */
    allowEIO3?: boolean;
    /**
     * Destroy unhandled upgrade requests
     * @default true
     */
    destroyUpgrade?: boolean;
    /**
     * Milliseconds after which unhandled requests are ended
     * @default 1_000
     */
    destroyUpgradeTimeout?: number;
}