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/**
* 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 type EventNames<Map extends EventsMap> = keyof Map & (string | symbol);
/** The tuple type representing the parameters of an event listener */
export type EventParams<
Map extends EventsMap,
Ev extends EventNames<Map>
> = Parameters<Map[Ev]>;
/**
* The event names that are either in ReservedEvents or in UserEvents
*/
export 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 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
*/
type FallbackToUntypedListener<T> = [T] extends [never]
? (...args: any[]) => void | Promise<void>
: T;
/**
* 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 class Emitter<
ListenEvents extends EventsMap,
EmitEvents extends EventsMap,
ReservedEvents extends EventsMap = {}
> {
/**
* 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;
/**
* Removes the `listener` function as an event listener for `ev`.
*
* @param ev Name of the event
* @param listener Callback function
*/
off<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>
): this;
/**
* 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>
): this;
/**
* 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>[];
/**
* Returns true if there is a listener for this event.
*
* @param event Event name
* @returns boolean
*/
hasListeners<
Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>
>(event: Ev): boolean;
/**
* Removes the `listener` function as an event listener for `ev`.
*
* @param ev Name of the event
* @param listener Callback function
*/
removeListener<
Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>
>(
ev?: Ev,
listener?: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
): this;
/**
* Removes all `listener` function as an event listener for `ev`.
*
* @param ev Name of the event
*/
removeAllListeners<
Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>
>(ev?: Ev): this;
}
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