Method on

extensions/vscode/src/mcp/eventBus.ts:12–18

(type: CgcEventType, listener: Listener)

  private readonly listeners = new Map<CgcEventType, Set<Listener>>();

  public on(type: CgcEventType, listener: Listener): () => void {
    if (!this.listeners.has(type)) {
      this.listeners.set(type, new Set());
    }
    this.listeners.get(type)!.add(listener);
    return () => this.off(type, listener);
  }

  public off(type: CgcEventType, listener: Listener): void {
    this.listeners.get(type)?.delete(listener);