/**
 * Data types for event name
 */
export type AllowedEventTypes = string | symbol | number | Constructor;
/**
 * Class constructor type
 */
export type Constructor<T = unknown> = new (...args: any[]) => T;
/**
 * A function that lazily imports a middleware
 */
export type LazyImport<DefaultExport> = () => Promise<{
    default: DefaultExport;
}>;
/**
 * Data structure for a buffered event
 */
export type BufferedEvent<Event, Data> = {
    event: Event;
    data: Data;
};
/**
 * Event list item inside bufferred items
 */
export type BufferedEventsList<EventsList> = {
    [Name in keyof EventsList]: BufferedEvent<Name, EventsList[Name]>;
}[keyof EventsList] | BufferedEvent<Constructor<any>, any>;
/**
 * Representation of listener method on the listener class. The
 * spread args can type hint dependencies and container will
 * resolve them
 */
export type ListenerMethod<Data> = (data: Data, ...args: any[]) => any | Promise<any>;
/**
 * The event listener defined as an inline callback
 */
export type ListenerFn<Data> = (data: Data) => any | Promise<any>;
/**
 * Returns a union of methods from a listener that accepts
 * the event data as the first argument.
 */
export type GetListenersMethods<Listener extends Constructor<any>, Data> = {
    [K in keyof InstanceType<Listener>]: InstanceType<Listener>[K] extends ListenerMethod<Data> ? K : never;
}[keyof InstanceType<Listener>];
/**
 * Representation of listener class with handle method
 */
export type ListenerClassWithHandleMethod<Data> = Constructor<{
    handle: ListenerMethod<Data>;
}>;
/**
 * The event listener defined as an inline callback, string
 * listener class reference or a lazily imported listener
 */
export type Listener<Data, ListenerClass extends Constructor> = ListenerFn<Data> | string | [LazyImport<ListenerClass> | ListenerClass, GetListenersMethods<ListenerClass, Data>?];
/**
 * The EmitterLike interface exposes a less strict API to accept
 * emitter as an argument to emit events.
 */
export interface EmitterLike<EventsList extends Record<string | symbol | number, any>> {
    /**
     * Emit event. The event listeners will be called asynchronously
     * in parallel.
     *
     * You can await this method to wait for events listeners to finish
     */
    emit<Event extends Constructor<any>>(event: Event, data: InstanceType<Event>): Promise<void>;
    emit<Name extends keyof EventsList>(event: Name, data: EventsList[Name]): Promise<void>;
    /**
     * Emit events serially. The event listeners will be called asynchronously
     * in the same sequence as they are registered.
     *
     * You can await this method to wait for events listeners to finish
     */
    emitSerial<Event extends Constructor<any>>(event: Event, data: InstanceType<Event>): Promise<void>;
    emitSerial<Name extends keyof EventsList>(event: Name, data: EventsList[Name]): Promise<void>;
    /**
     * Find if an event has one or more listeners
     */
    listenerCount(event?: keyof EventsList | Constructor<any>): number;
    /**
     * Get count of listeners for a given event or all the events
     */
    hasListeners(event?: keyof EventsList | Constructor<any>): boolean;
}