MrKBear/mini-dlpu-v3
MrKBear/mini-dlpu-v3
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(#60) Core emitter generic optimization

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MrKBear 2022-01-22 16:10:24 +08:00
parent 43d87b40f7
commit c385965655
1 changed files with 7 additions and 1 deletions
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8
miniprogram/core/Emitter.ts
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@ -13,6 +13,10 @@ export type EventHandlerMap<Events extends Record<EventType, any>> = Map<
EventHandlerList<Events[keyof Events]> EventHandlerList<Events[keyof Events]>
>; >;
// Emitter function type
type IEmitParamType<E extends Record<EventType, any>, K extends keyof E> =
E[K] extends ( undefined | void ) ? [K] : [K, E[K]];
export class Emitter<Events extends Record<EventType, any>> { export class Emitter<Events extends Record<EventType, any>> {
/** /**
@ -74,7 +78,8 @@ export class Emitter<Events extends Record<EventType, any>> {
* @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler * @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler
* @memberOf mitt * @memberOf mitt
*/ */
emit<Key extends keyof Events>(type: Key, evt: Events[Key]) { public emit<Key extends keyof Events>(...param: IEmitParamType<Events, Key>): this {
const [ type, evt ] = param;
let handlers = this.all!.get(type); let handlers = this.all!.get(type);
if (handlers) { if (handlers) {
(handlers as EventHandlerList<Events[keyof Events]>) (handlers as EventHandlerList<Events[keyof Events]>)
@ -83,5 +88,6 @@ export class Emitter<Events extends Record<EventType, any>> {
handler(evt!); handler(evt!);
}); });
} }
return this;
} }
} }