22 lines
1.3 KiB
TypeScript
22 lines
1.3 KiB
TypeScript
|
export declare type EventType = string | symbol;
|
||
|
|
export declare type Handler<T = unknown> = (event: T) => void;
|
||
|
|
export declare type WildcardHandler<T = Record<string, unknown>> = (type: keyof T, event: T[keyof T]) => void;
|
||
|
|
export declare type EventHandlerList<T = unknown> = Array<Handler<T>>;
|
||
|
|
export declare type WildCardEventHandlerList<T = Record<string, unknown>> = Array<WildcardHandler<T>>;
|
||
|
|
export declare type EventHandlerMap<Events extends Record<EventType, unknown>> = Map<keyof Events | '*', EventHandlerList<Events[keyof Events]> | WildCardEventHandlerList<Events>>;
|
||
|
|
export interface Emitter<Events extends Record<EventType, unknown>> {
|
||
|
|
all: EventHandlerMap<Events>;
|
||
|
|
on<Key extends keyof Events>(type: Key, handler: Handler<Events[Key]>): void;
|
||
|
|
on(type: '*', handler: WildcardHandler<Events>): void;
|
||
|
|
off<Key extends keyof Events>(type: Key, handler?: Handler<Events[Key]>): void;
|
||
|
|
off(type: '*', handler: WildcardHandler<Events>): void;
|
||
|
|
emit<Key extends keyof Events>(type: Key, event: Events[Key]): void;
|
||
|
|
emit<Key extends keyof Events>(type: undefined extends Events[Key] ? Key : never): void;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Mitt: Tiny (~200b) functional event emitter / pubsub.
|
||
|
|
* @name mitt
|
||
|
|
* @returns {Mitt}
|
||
|
|
*/
|
||
|
|
export default function mitt<Events extends Record<EventType, unknown>>(all?: EventHandlerMap<Events>): Emitter<Events>;
|