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refactoring

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This commit is contained in:
Philipp Kühn
2021-09-30 09:34:45 +02:00
parent 54e85fd284
commit 8db5a943d2
3 changed files with 16 additions and 9 deletions
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18
packages/core/src/EventEmitter.ts
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@@ -1,12 +1,18 @@
type StringKeyOf<T> = Extract<keyof T, string>;
type CallbackType<T extends Record<string, any>, EVENT extends StringKeyOf<T>> = T[EVENT] extends any[] ? T[EVENT] : [T[EVENT]];
type CallbackFunction<T extends Record<string, any>, EVENT extends StringKeyOf<T>> = (...props: CallbackType<T, EVENT>) => any
type StringKeyOf<T> = Extract<keyof T, string>
type CallbackType<
T extends Record<string, any>,
EventName extends StringKeyOf<T>,
> = T[EventName] extends any[] ? T[EventName] : [T[EventName]]
type CallbackFunction<
T extends Record<string, any>,
EventName extends StringKeyOf<T>,
> = (...props: CallbackType<T, EventName>) => any
export default class EventEmitter<T extends Record<string, any>> {
private callbacks: { [key: string]: Function[] } = {}
public on<EVENT extends StringKeyOf<T>>(event: EVENT, fn: CallbackFunction<T, EVENT>): this {
public on<EventName extends StringKeyOf<T>>(event: EventName, fn: CallbackFunction<T, EventName>): this {
if (!this.callbacks[event]) {
this.callbacks[event] = []
}
@@ -16,7 +22,7 @@ export default class EventEmitter<T extends Record<string, any>> {
return this
}
protected emit<EVENT extends StringKeyOf<T>>(event: EVENT, ...args: CallbackType<T, EVENT>): this {
protected emit<EventName extends StringKeyOf<T>>(event: EventName, ...args: CallbackType<T, EventName>): this {
const callbacks = this.callbacks[event]
if (callbacks) {
@@ -26,7 +32,7 @@ export default class EventEmitter<T extends Record<string, any>> {
return this
}
public off<EVENT extends StringKeyOf<T>>(event: EVENT, fn?: CallbackFunction<T, EVENT>): this {
public off<EventName extends StringKeyOf<T>>(event: EventName, fn?: CallbackFunction<T, EventName>): this {
const callbacks = this.callbacks[event]
if (callbacks) {