Refactored events to use a small global event bus

src/event-bus.ts

@@ -0,0 +1,36 @@
+export type EventBusCallback = (...args: any[]) => any
+
+export class EventBus {
+  private handlers: Map<string, EventBusCallback> = new Map()
+  private disabled: string[] = []
+
+  public on(ctx: string, event: string, callback: EventBusCallback): void {
+    if (ctx.includes('@') || event.includes('@')) {
+      throw new Error('Invalid ctx/event name - Cannot contain @')
+    }
+    this.handlers.set(`${ctx}@${event}`, callback)
+  }
+
+  public off(ctx: string, event: string): void {
+    this.handlers.delete(`${ctx}@${event}`)
+  }
+
+  public disable(ctx: string): void {
+    this.enable(ctx)
+    this.disabled.push(ctx)
+  }
+
+  public enable(ctx: string): void {
+    this.disabled = this.disabled.filter(v => v !== ctx)
+  }
+
+  public emit(event: string, ...args: any[]): void {
+    for (const [key, handler] of this.handlers.entries()) {
+      const ctx = key.split('@')[0]
+      if (this.disabled.includes(ctx)) continue
+      if (key.endsWith(`@${event}`)) {
+        handler(...args)
+      }
+    }
+  }
+}