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- /// <reference types="node" />
- import { EventEmitter } from "events";
- /**
- * An events map is an interface that maps event names to their value, which
- * represents the type of the `on` listener.
- */
- export interface EventsMap {
- [event: string]: any;
- }
- /**
- * The default events map, used if no EventsMap is given. Using this EventsMap
- * is equivalent to accepting all event names, and any data.
- */
- export interface DefaultEventsMap {
- [event: string]: (...args: any[]) => void;
- }
- /**
- * Returns a union type containing all the keys of an event map.
- */
- export declare type EventNames<Map extends EventsMap> = keyof Map & (string | symbol);
- /** The tuple type representing the parameters of an event listener */
- export declare type EventParams<Map extends EventsMap, Ev extends EventNames<Map>> = Parameters<Map[Ev]>;
- /**
- * The event names that are either in ReservedEvents or in UserEvents
- */
- export declare type ReservedOrUserEventNames<ReservedEventsMap extends EventsMap, UserEvents extends EventsMap> = EventNames<ReservedEventsMap> | EventNames<UserEvents>;
- /**
- * Type of a listener of a user event or a reserved event. If `Ev` is in
- * `ReservedEvents`, the reserved event listener is returned.
- */
- export declare type ReservedOrUserListener<ReservedEvents extends EventsMap, UserEvents extends EventsMap, Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>> = FallbackToUntypedListener<Ev extends EventNames<ReservedEvents> ? ReservedEvents[Ev] : Ev extends EventNames<UserEvents> ? UserEvents[Ev] : never>;
- /**
- * Returns an untyped listener type if `T` is `never`; otherwise, returns `T`.
- *
- * This is a hack to mitigate https://github.com/socketio/socket.io/issues/3833.
- * Needed because of https://github.com/microsoft/TypeScript/issues/41778
- */
- declare type FallbackToUntypedListener<T> = [T] extends [never] ? (...args: any[]) => void | Promise<void> : T;
- /**
- * Interface for classes that aren't `EventEmitter`s, but still expose a
- * strictly typed `emit` method.
- */
- export interface TypedEventBroadcaster<EmitEvents extends EventsMap> {
- emit<Ev extends EventNames<EmitEvents>>(ev: Ev, ...args: EventParams<EmitEvents, Ev>): boolean;
- }
- /**
- * Strictly typed version of an `EventEmitter`. A `TypedEventEmitter` takes type
- * parameters for mappings of event names to event data types, and strictly
- * types method calls to the `EventEmitter` according to these event maps.
- *
- * @typeParam ListenEvents - `EventsMap` of user-defined events that can be
- * listened to with `on` or `once`
- * @typeParam EmitEvents - `EventsMap` of user-defined events that can be
- * emitted with `emit`
- * @typeParam ReservedEvents - `EventsMap` of reserved events, that can be
- * emitted by socket.io with `emitReserved`, and can be listened to with
- * `listen`.
- */
- export declare abstract class StrictEventEmitter<ListenEvents extends EventsMap, EmitEvents extends EventsMap, ReservedEvents extends EventsMap = {}> extends EventEmitter implements TypedEventBroadcaster<EmitEvents> {
- /**
- * Adds the `listener` function as an event listener for `ev`.
- *
- * @param ev Name of the event
- * @param listener Callback function
- */
- on<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(ev: Ev, listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>): this;
- /**
- * Adds a one-time `listener` function as an event listener for `ev`.
- *
- * @param ev Name of the event
- * @param listener Callback function
- */
- once<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(ev: Ev, listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>): this;
- /**
- * Emits an event.
- *
- * @param ev Name of the event
- * @param args Values to send to listeners of this event
- */
- emit<Ev extends EventNames<EmitEvents>>(ev: Ev, ...args: EventParams<EmitEvents, Ev>): boolean;
- /**
- * Emits a reserved event.
- *
- * This method is `protected`, so that only a class extending
- * `StrictEventEmitter` can emit its own reserved events.
- *
- * @param ev Reserved event name
- * @param args Arguments to emit along with the event
- */
- protected emitReserved<Ev extends EventNames<ReservedEvents>>(ev: Ev, ...args: EventParams<ReservedEvents, Ev>): boolean;
- /**
- * Emits an event.
- *
- * This method is `protected`, so that only a class extending
- * `StrictEventEmitter` can get around the strict typing. This is useful for
- * calling `emit.apply`, which can be called as `emitUntyped.apply`.
- *
- * @param ev Event name
- * @param args Arguments to emit along with the event
- */
- protected emitUntyped(ev: string, ...args: any[]): boolean;
- /**
- * Returns the listeners listening to an event.
- *
- * @param event Event name
- * @returns Array of listeners subscribed to `event`
- */
- listeners<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(event: Ev): ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>[];
- }
- export {};
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