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export type EvName = string;
export type Fn<    Params extends readonly unknown[] = readonly unknown[],    Result = unknown,> = (...params: Params) => Result;
/** * Returns a union type containing all the keys of an event map. */export type EventNames<Map extends CustomEventMap> = keyof Map & EvName;
/** * Interface for classes that aren't `EventEmitter`s, but still expose a * strictly typed `emit` method. */export interface TypedEventBroadcaster<EmitEvents extends CustomEventMap> {    emit<Ev extends EventNames<EmitEvents>>(        ev: Ev,        ...args: CustomEventDetailParameter<EmitEvents, Ev>    ): this;}
export type TypedCustomEvent<    Type extends EvName,    Detail = unknown,> = CustomEvent<Detail> & { type: Type };
export type EventTargetCompatible = Extract<    Parameters<EventTarget["addEventListener"]>[1],    Fn>;// for untyped emitter// deno-lint-ignore no-explicit-anyexport type CustomEventMap = Record<EvName, any>;
export type CustomEventListenerMap<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<        ReservedEvents,        UserEvents    > = ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = Map<    ReservedOrUserListenerOnOrAddEventListener<ReservedEvents, UserEvents, Ev>,    ReservedOrUserListenerAddEventListener<ReservedEvents, UserEvents, Ev>>;
export type CustomEventDetailParameter<    T extends CustomEventMap,    K extends keyof T,> = unknown extends T[K] ? [detail?: unknown]    : undefined extends T[K] ? [detail?: T[K]]    : T[K] extends never ? []    : [detail: T[K]];
export type CustomEventCallbackAddEventListener<    Ev extends EvName = EvName,    Detail = unknown,> = Fn<[event: TypedCustomEvent<Ev, Detail>], void>;
export type CustomEventCallbackOn<    Ev extends EvName = EvName,    Detail = unknown,> = Fn<[event: TypedCustomEvent<Ev, Detail>["detail"]], void>;
/** * 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 */export type FallbackToUntypedListener<T> = [T] extends [never]    // deno-lint-ignore no-explicit-any    ? (...args: any[]) => void | Promise<void>    : T;
/** * The event names that are either in ReservedEvents or in UserEvents */export type ReservedOrUserEventNames<    ReservedEventsMap extends CustomEventMap,    UserEvents extends CustomEventMap,> = EventNames<ReservedEventsMap> | EventNames<UserEvents>;
export type ReservedOrUserListenerParamsAddEventListener<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = Parameters<    ReservedOrUserListenerAddEventListener<ReservedEvents, UserEvents, Ev>>[0];
/** * 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 ReservedOrUserListenerOn<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = FallbackToUntypedListener<    Ev extends EventNames<ReservedEvents>        ? CustomEventCallbackOn<Ev, ReservedEvents[Ev]>        : Ev extends EventNames<UserEvents>            ? CustomEventCallbackOn<Ev, UserEvents[Ev]>        : never>;
export type ReservedOrUserListenerAddEventListener<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = FallbackToUntypedListener<    Ev extends EventNames<ReservedEvents>        ? CustomEventCallbackAddEventListener<Ev, ReservedEvents[Ev]>        : Ev extends EventNames<UserEvents>            ? CustomEventCallbackAddEventListener<Ev, UserEvents[Ev]>        : never>;
export type ReservedOrUserListenerOnOrAddEventListener<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = FallbackToUntypedListener<    Ev extends EventNames<ReservedEvents> ?             | CustomEventCallbackAddEventListener<Ev, ReservedEvents[Ev]>            | CustomEventCallbackOn<Ev, ReservedEvents[Ev]>        : Ev extends EventNames<UserEvents> ?                 | CustomEventCallbackAddEventListener<Ev, UserEvents[Ev]>                | CustomEventCallbackOn<Ev, UserEvents[Ev]>        : never>;
export type ReservedOrUserListenerOnParams<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = Parameters<ReservedOrUserListenerOn<ReservedEvents, UserEvents, Ev>>[0];
export type ReservedOrUserListenerAddEventListenerParams<    ReservedEvents extends CustomEventMap,    UserEvents extends CustomEventMap,    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>,> = Parameters<    ReservedOrUserListenerAddEventListener<ReservedEvents, UserEvents, Ev>>[0];