import { IRequestBodyValidator } from "../options/IRequestBodyValidator";
import { IRequestQueryValidator } from "../options/IRequestQueryValidator";
/**
 * WebSocket route decorator.
 *
 * `@WebSocketRoute()` is a route decorator function for WebSocket routes. If
 * you want to define a WebSocket route with this `@WebSocketRoute` decorator,
 * please don't forget to call the {@link WebSocketAdaptor.upgrade} function to
 * the {@link INestApplication} instance.
 *
 * Also, `WebSocketRoute` is a module containing parameter decorator functions
 * of below for the `@WebSocketRoute` decorated method, at the same time. Note
 * that, every parameters must be decorated by one of the parameter decorators
 * in the `WebSocketRoute` module. One thing more important is,
 * {@link WebSocketRoute.Acceptor} decorated parameter must be defined in the
 * method. If not, it would be both compilation/runtime error.
 *
 * - {@link WebSocketRoute.Acceptor}
 * - {@link WebSocketRoute.Driver}
 * - {@link WebSocketRoute.Header}
 * - {@link WebSocketRoute.Param}
 * - {@link WebSocketRoute.Query}
 *
 * For reference, key difference between `@WebSocketGateway()` of NestJS and
 * `@WebSocketRoute()` of Nestia is, `@WebSocketRoute()` can make multiple
 * WebSocket routes by configuring _paths_, besides `@WebSocketGateway()` can't
 * do it.
 *
 * Furthermore, if you build SDK (Software Development Kit) library through
 * `@nestia/sdk`, you can make safe WebSocket client taking advantages of
 * TypeScript type hints and checks.
 *
 * @author Jeongho Nam - https://github.com/samchon
 * @param path Path(s) of the WebSocket request
 * @returns Method decorator
 */
export declare function WebSocketRoute(path?: undefined | string | string[]): MethodDecorator;
export declare namespace WebSocketRoute {
    /**
     * Acceptor parameter decorator.
     *
     * `@WebSocketRoute.Acceptor()` is a parameter decorator function for the
     * `WebSocketAcceptor<Header, Provider, Listener>` (of `tgrid`) typed
     * parameter.
     *
     * In the controller method decorated by `@WebSocketRoute()` and
     * `@WebSocketRoute.Acceptor()`, call {@link WebSocketAcceptor.accept} function
     * with `Provider` instance when you want to accept the WebSocket client
     * connection. Otherwise you want to reject the connection, call
     * {@link WebSocketAcceptor.rejcet} function instead.
     *
     * For reference, this `@WebSocketRoute.Acceptor()` parameter decorator is
     * essential for the method decorated by `@WebSocketRoute()` decorator. If you
     * forget it, it would be both compilation/runtime error.
     */
    function Acceptor(): ParameterDecorator;
    /**
     * Driver parameter decorator.
     *
     * `@WebSocketRoute.Driver()` is a parameter decorator function for the
     * `Driver<Listener>` (of `tgrid`) typed parameter.
     *
     * With the `@WebSocketRoute.Driver()` decorated parameter, you can call
     * function of `Listener` typed instance provided by remote WebSocket client
     * by calling the `Driver<Listener>` instance.
     *
     * For reference, this `@WebSocketRoute.Driver()` decorator is optional, and
     * can be substituted by `@WebSocketRoute.Acceptor()` decorated parameter by
     * calling the {@link WebSocketAcceptor.getDriver} function.
     */
    function Driver(): ParameterDecorator;
    /**
     * Header decorator.
     *
     * `@WebSocketRoute.Header()` is a parameter decorator function for the
     * WebSocket header with type casting and assertion.
     *
     * For reference, `@WebSocketRoute.Header()` is different with HTTP headers.
     * It's for WebSocket protocol, especially for TGrid's
     * {@link WebSocketConnector} and {@link WebSocketAcceptor}'s special header.
     *
     * Also, this `@WebSocketRoute.Header()` decorator is optional, and can be
     * substituted by `@WebSocketRoute.Acceptor()` decorated parameter by
     * accessting to the {@link WebSocketAcceptor.header} property.
     */
    function Header<T>(validator?: IRequestBodyValidator<T>): ParameterDecorator;
    /**
     * URL parameter decorator.
     *
     * `@WebSocketRoute.Param()` is a parameter decorator function for the URL
     * parameter with type casting and assertion.
     *
     * It's almost same with the {@link TypedParam}, but `@WebSocketRoute.Param()`
     * is only for WebSocket protocol router function decorated by
     * {@link WebSocketRoute}.
     *
     * @param field URL parameter field name
     */
    function Param<T extends boolean | bigint | number | string | null>(field: string, assert?: (value: string) => T): ParameterDecorator;
    /**
     * URL query decorator.
     *
     * `@WebSocketRoute.Query()` is a parameter decorator function for the URL
     * query string with type casting and assertion.
     *
     * It is almost same with {@link TypedQuery}, but `@WebSocketRoute.Query()` is
     * only for WebSocket protocol router function decorated by
     * {@link WebSocketRoute}.
     *
     * For reference, as same with {@link TypedQuery}, `@WebSocketRoute.Query()`
     * has same restriction for the target type `T`. If actual URL query parameter
     * values are different with their promised type `T`, it would be runtime
     * error.
     *
     * 1. Type `T` must be an object type
     * 2. Do not allow dynamic property
     * 3. Only `boolean`, `bigint`, `number`, `string` or their array types are
     *    allowed
     * 4. By the way, union type never be not allowed
     */
    function Query<T extends object>(validator?: IRequestQueryValidator<T>): ParameterDecorator;
}