refactor: add EventBus class

shared/utils/event-bus.ts

@@ -0,0 +1,30 @@
+/**
+ * 独立事件分发工具类
+ *
+ * @example
+ * const event = new EventBus();
+ * event.on(() => {
+ *   console.log('trigger')
+ * })
+ * event.fire();
+ */
+export class EventBus<Args extends unknown[] = []> {
+  listeners: ((...args: Args) => void)[] = [];
+
+  fire(...args: Args) {
+    this.listeners.forEach((fn) => {
+      fn(...args);
+    });
+  }
+
+  on(fn: (...args: Args) => void) {
+    this.listeners.push(fn);
+  }
+
+  off(fn: (...args: Args) => void) {
+    const index = this.listeners.indexOf(fn);
+    if (index >= 0) {
+      this.listeners.splice(index, 1);
+    }
+  }
+}