MrKBear/mini-dlpu-v3
MrKBear/mini-dlpu-v3
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(#60) Core emitter generic optimization #61

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MrKBear merged 1 commits from dev-mrkbear into master 2022-01-22 16:13:40 +08:00
Conversation 0 Commits 1 Files Changed 1 +7 -1
1 changed files with 7 additions and 1 deletions
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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]>
>;
// 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>> {
/**
@ -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
* @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);
if (handlers) {
(handlers as EventHandlerList<Events[keyof Events]>)
@ -83,5 +88,6 @@ export class Emitter<Events extends Record<EventType, any>> {
handler(evt!);
});
}
return this;
}
}