Method subscribe

projects/runtime-client/src/client.ts:307–313

(listener: NotificationListener)

    }

    subscribe(listener: NotificationListener): () => void {
        this.listeners.add(listener)
        void this.connect()
        return () => {
            this.listeners.delete(listener)
        }
    }

    async close(): Promise<void> {
        this.disposeMessageListener?.()