From cd69bb4fb44f5fd332523aa849c723fc06504dc3 Mon Sep 17 00:00:00 2001
From: Il Harper <hi@ilharper.com>
Date: Tue, 5 Mar 2024 21:42:35 +0800
Subject: [PATCH] feat(api): implement emitter

---
 packages/engine-chronocat-api/src/emitter.ts  | 24 +++++++++++++++++++
 .../engine-chronocat-api/src/globalVars.ts    |  3 +++
 2 files changed, 27 insertions(+)
 create mode 100644 packages/engine-chronocat-api/src/emitter.ts

diff --git a/packages/engine-chronocat-api/src/emitter.ts b/packages/engine-chronocat-api/src/emitter.ts
new file mode 100644
index 0000000..3358da9
--- /dev/null
+++ b/packages/engine-chronocat-api/src/emitter.ts
@@ -0,0 +1,24 @@
+/* eslint-disable @typescript-eslint/no-unsafe-declaration-merging */
+
+import { EventEmitter } from 'node:events'
+
+type EmittedEvents = Record<string | symbol, (...args: unknown[]) => unknown>
+
+export interface TypedEventEmitter<ES extends EmittedEvents> {
+  on<E extends keyof ES>(event: E, listener: ES[E]): this
+  once<E extends keyof ES>(event: E, listener: ES[E]): this
+  emit<E extends keyof ES>(event: E, ...args: Parameters<ES[E]>): boolean
+}
+
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+export class TypedEventEmitter<ES extends EmittedEvents> extends EventEmitter {}
+
+export type ChronoEvents = {
+  buddyListChange: () => void
+  groupListUpdate: () => void
+}
+
+export class ChronoEventEmitter extends TypedEventEmitter<ChronoEvents> {
+  emitBuddyListChange = () => this.emit('buddyListChange')
+  emitGroupListUpdate = () => this.emit('groupListUpdate')
+}
diff --git a/packages/engine-chronocat-api/src/globalVars.ts b/packages/engine-chronocat-api/src/globalVars.ts
index 8de4865..fc1d62d 100644
--- a/packages/engine-chronocat-api/src/globalVars.ts
+++ b/packages/engine-chronocat-api/src/globalVars.ts
@@ -1,4 +1,5 @@
 import type { Group, Profile, RedIpcData, RedIpcEvent } from '@chronocat/red'
+import { ChronoEventEmitter } from './emitter'
 
 export const requestMethodMap: Record<string, string> = {}
 export const requestCallbackMap: Record<
@@ -10,3 +11,5 @@ export const groupMap: Record<string, Group> = {}
 export const roleMap: Record<string, Record<string, number>> = {}
 export const friendMap: Record<string, Profile> = {}
 export const richMediaDownloadMap: Record<string, (path: string) => void> = {}
+
+export const chronoEventEmitter = new ChronoEventEmitter()