feat: add EventBus core module

src/core/EventBus.ts

@@ -0,0 +1,57 @@
+type EventCallback = (...args: any[]) => void;
+
+class EventBus {
+  private events: Map<string, Set<EventCallback>> = new Map();
+
+  on(event: string, callback: EventCallback): () => void {
+    if (!this.events.has(event)) {
+      this.events.set(event, new Set());
+    }
+    this.events.get(event)!.add(callback);
+
+    // 返回取消订阅函数
+    return () => this.off(event, callback);
+  }
+
+  off(event: string, callback: EventCallback): void {
+    const callbacks = this.events.get(event);
+    if (callbacks) {
+      callbacks.delete(callback);
+      if (callbacks.size === 0) {
+        this.events.delete(event);
+      }
+    }
+  }
+
+  once(event: string, callback: EventCallback): () => void {
+    const onceCallback: EventCallback = (...args) => {
+      callback(...args);
+      this.off(event, onceCallback);
+    };
+    return this.on(event, onceCallback);
+  }
+
+  emit(event: string, ...args: any[]): void {
+    const callbacks = this.events.get(event);
+    if (callbacks) {
+      callbacks.forEach(cb => {
+        try {
+          cb(...args);
+        } catch (e) {
+          console.error(`EventBus: error in event "${event}"`, e);
+        }
+      });
+    }
+  }
+
+  clear(): void {
+    this.events.clear();
+  }
+
+  getEventCount(): number {
+    return this.events.size;
+  }
+}
+
+export const eventBus = new EventBus();
+export default eventBus;