import { Constructor, MetadataAccessor } from '@loopback/core';
/**
 * Metadata for SocketIo
 */
export interface SocketIoMetadata {
    name?: string;
    namespace?: string | RegExp;
}
export declare const SOCKET_IO_METADATA: MetadataAccessor<SocketIoMetadata, ClassDecorator>;
export declare const SOCKET_IO_SUBSCRIBE_METADATA: MetadataAccessor<(string | RegExp)[], MethodDecorator>;
export declare const SOCKET_IO_CONNECT_METADATA: MetadataAccessor<boolean, MethodDecorator>;
/**
 * Decorate a socketio controller class to specify the namespace.
 *
 * @example
 * ```ts
 * @socketio({namespace: '/chats'})
 * export class SocketIoController {}
 * ```
 * @param spec A namespace or object
 */
export declare function socketio(spec?: SocketIoMetadata | string | RegExp): ClassDecorator;
export declare function getSocketIoMetadata(controllerClass: Constructor<unknown>): SocketIoMetadata | undefined;
export declare namespace socketio {
    function io(): (target: Object, member: string | undefined, methodDescriptorOrParameterIndex?: number | TypedPropertyDescriptor<any> | undefined) => void;
    function namespace(name: string): (target: Object, member: string | undefined, methodDescriptorOrParameterIndex?: number | TypedPropertyDescriptor<any> | undefined) => void;
    function socket(): (target: Object, member: string | undefined, methodDescriptorOrParameterIndex?: number | TypedPropertyDescriptor<any> | undefined) => void;
    /**
     * Decorate a method to subscribe to socketio events.
     * For example,
     * ```ts
     * @socketio.subscribe('chat message')
     * async function onChat(msg: string) {
     * }
     * ```
     * @param messageTypes
     */
    function subscribe(...messageTypes: (string | RegExp)[]): MethodDecorator;
    /**
     * Decorate a controller method for `disconnect`
     */
    function disconnect(): MethodDecorator;
    /**
     * Decorate a controller method for `connect`
     */
    function connect(): MethodDecorator;
}