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1import { MoonlightEventEmitter } from "@moonlight-mod/types/core/event";
2
3export function createEventEmitter<
4 EventId extends string = string,
5 EventData = Record<EventId, any>
6>(): MoonlightEventEmitter<EventId, EventData> {
7 webTarget: {
8 const eventEmitter = new EventTarget();
9 const listeners = new Map<(data: EventData) => void, (e: Event) => void>();
10
11 return {
12 dispatchEvent: <Id extends keyof EventData>(id: Id, data: EventData[Id]) => {
13 eventEmitter.dispatchEvent(new CustomEvent(id as string, { detail: data }));
14 },
15
16 addEventListener: <Id extends keyof EventData>(id: Id, cb: (data: EventData[Id]) => void) => {
17 const untyped = cb as (data: EventData) => void;
18 if (listeners.has(untyped)) return;
19
20 function listener(e: Event) {
21 const event = e as CustomEvent<string>;
22 cb(event.detail as EventData[Id]);
23 }
24
25 listeners.set(untyped, listener);
26 eventEmitter.addEventListener(id as string, listener);
27 },
28
29 removeEventListener: <Id extends keyof EventData>(id: Id, cb: (data: EventData[Id]) => void) => {
30 const untyped = cb as (data: EventData) => void;
31 const listener = listeners.get(untyped);
32 if (listener == null) return;
33 listeners.delete(untyped);
34 eventEmitter.removeEventListener(id as string, listener);
35 }
36 };
37 }
38
39 nodeTarget: {
40 const EventEmitter = require("events");
41 const eventEmitter = new EventEmitter();
42 const listeners = new Map<(data: EventData) => void, (e: Event) => void>();
43
44 return {
45 dispatchEvent: <Id extends keyof EventData>(id: Id, data: EventData[Id]) => {
46 eventEmitter.emit(id as string, data);
47 },
48
49 addEventListener: <Id extends keyof EventData>(id: Id, cb: (data: EventData[Id]) => void) => {
50 const untyped = cb as (data: EventData) => void;
51 if (listeners.has(untyped)) return;
52
53 function listener(e: Event) {
54 const event = e as CustomEvent<string>;
55 cb(event as EventData[Id]);
56 }
57
58 listeners.set(untyped, listener);
59 eventEmitter.on(id as string, listener);
60 },
61
62 removeEventListener: <Id extends keyof EventData>(id: Id, cb: (data: EventData[Id]) => void) => {
63 const untyped = cb as (data: EventData) => void;
64 const listener = listeners.get(untyped);
65 if (listener == null) return;
66 listeners.delete(untyped);
67 eventEmitter.off(id as string, listener);
68 }
69 };
70 }
71
72 throw new Error("Called createEventEmitter() in an impossible environment");
73}