AK-21/Graphite-Industrial-Intelligence

1export declare type EventType = string | symbol;
2export declare type Handler<T = unknown> = (event: T) => void;
3export declare type WildcardHandler<T = Record<string, unknown>> = (type: keyof T, event: T[keyof T]) => void;
4export declare type EventHandlerList<T = unknown> = Array<Handler<T>>;
5export declare type WildCardEventHandlerList<T = Record<string, unknown>> = Array<WildcardHandler<T>>;
6export declare type EventHandlerMap<Events extends Record<EventType, unknown>> = Map<keyof Events | '*', EventHandlerList<Events[keyof Events]> | WildCardEventHandlerList<Events>>;
7export interface Emitter<Events extends Record<EventType, unknown>> {
8    all: EventHandlerMap<Events>;
9    on<Key extends keyof Events>(type: Key, handler: Handler<Events[Key]>): void;
10    on(type: '*', handler: WildcardHandler<Events>): void;
11    off<Key extends keyof Events>(type: Key, handler?: Handler<Events[Key]>): void;
12    off(type: '*', handler: WildcardHandler<Events>): void;
13    emit<Key extends keyof Events>(type: Key, event: Events[Key]): void;
14    emit<Key extends keyof Events>(type: undefined extends Events[Key] ? Key : never): void;
15}
16/**
17 * Mitt: Tiny (~200b) functional event emitter / pubsub.
18 * @name mitt
19 * @returns {Mitt}
20 */
21export default function mitt<Events extends Record<EventType, unknown>>(all?: EventHandlerMap<Events>): Emitter<Events>;
22