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