1export declare type EventType = string | symbol;
2export declare type Handler<T = any> = (event?: T) => void;
3export declare type WildcardHandler = (type: EventType, event?: any) => void;
4export declare type EventHandlerList = Array<Handler>;
5export declare type WildCardEventHandlerList = Array<WildcardHandler>;
6export declare type EventHandlerMap = Map<EventType, EventHandlerList | WildCardEventHandlerList>;
7export interface Emitter {
8    all: EventHandlerMap;
9    on<T = any>(type: EventType, handler: Handler<T>): void;
10    on(type: '*', handler: WildcardHandler): void;
11    off<T = any>(type: EventType, handler: Handler<T>): void;
12    off(type: '*', handler: WildcardHandler): void;
13    emit<T = any>(type: EventType, event?: T): void;
14    emit(type: '*', event?: any): void;
15}
16/**
17 * Mitt: Tiny (~200b) functional event emitter / pubsub.
18 * @name mitt
19 * @returns {Mitt}
20 */
21export default function mitt(all?: EventHandlerMap): Emitter;
22