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/** * @public */export declare type EventType = string | symbol;/** * @public */export declare type Handler<T = any> = (event?: T) => void;export declare type WildcardHandler = (type: EventType, event?: any) => void;export declare type EventHandlerList = Array<Handler>;export declare type WildCardEventHandlerList = Array<WildcardHandler>;export declare type EventHandlerMap = Map<  EventType,  EventHandlerList | WildCardEventHandlerList>;export interface Emitter {  all: EventHandlerMap;  on<T = any>(type: EventType, handler: Handler<T>): void;  on(type: "*", handler: WildcardHandler): void;  off<T = any>(type: EventType, handler: Handler<T>): void;  off(type: "*", handler: WildcardHandler): void;  emit<T = any>(type: EventType, event?: T): void;  emit(type: "*", event?: any): void;}/** * Mitt: Tiny (~200b) functional event emitter / pubsub. * @name mitt * @returns {Mitt} */export default function mitt(all?: EventHandlerMap): Emitter;